Metadata: Identification_Information: Citation: Citation_Information: Originator: U.S. Geological Survey Publication_Date: 200501 Title: Significant United States Earthquakes, 1568-2004 Publication_Information: Publication_Place: Reston, VA Publisher: National Atlas of the United States Online_Linkage: Description: Abstract: This map layer contains the locations and attributes of significant, historic earthquakes that caused deaths, property damage, and geological effects, or were otherwise experienced by populations in the United States, Puerto Rico, and U.S. Virgin Islands. Included are earthquakes located in the United States as well as some that occurred in adjacent portions of Canada and Mexico. The main sources for the data are Seismicity of the United States, 1568-1989 and the Preliminary Determination of Epicenters for 1990 to January 2004. This is a replacement for the June 1999 map layer. Purpose: These data are intended for geographic display and analysis at the national level, and for large regional areas. The data should be displayed and analyzed at scales appropriate for 1:2,000,000-scale data. No responsibility is assumed by the National Atlas of the United States or the U.S. Geological Survey in the use of these data. This map layer is intended for a mixed audience of specialists and non-specialists alike who have a need for general, non-technical information about significant United States earthquakes. Supplemental_Information: Provided with the downloadable files is a text file, quksigx_references.txt, which contains the reference information for earthquake magnitudes listed in the data. Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 15680101 Ending_Date: 20040131 Currentness_Reference: Ground condition Status: Progress: Complete Maintenance_and_Update_Frequency: As needed Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: 143 East_Bounding_Coordinate: -60 North_Bounding_Coordinate: 65 South_Bounding_Coordinate: 10 Keywords: Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: environment Theme_Keyword: geoscientificInformation Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: Earthquakes Theme_Keyword: Seismic events Theme_Keyword: Magnitude Theme_Keyword: Body wave magnitude Theme_Keyword: Surface wave magnitude Theme_Keyword: Modified Mercalli Intensity Scale Place: Place_Keyword_Thesaurus: U.S. Department of Commerce, 1995, Countries, Dependencies, Areas of Special Sovereignty, and Their Principal Administrative Divisions (Federal Information Processing Standard 10-4): Washington, DC, National Institute of Standards and Technology. Place_Keyword: United States Place_Keyword: Canada Place_Keyword: Mexico Place: Place_Keyword_Thesaurus: None Place_Keyword: USA Place: Place_Keyword_Thesaurus: U.S. Department of Commerce, 1987, Codes for the Identification of the States, the District of Columbia and the Outlying Areas of The United States, and Associated Areas (Federal Processing Standard 5-2): Washington, DC, National Institute of Standards and Technology. Place_Keyword: Alabama Place_Keyword: Alaska Place_Keyword: Arizona Place_Keyword: Arkansas Place_Keyword: California Place_Keyword: Colorado Place_Keyword: Connecticut Place_Keyword: Delaware Place_Keyword: District of Columbia Place_Keyword: Florida Place_Keyword: Georgia Place_Keyword: Hawaii Place_Keyword: Idaho Place_Keyword: Illinois Place_Keyword: Indiana Place_Keyword: Iowa Place_Keyword: Kansas Place_Keyword: Kentucky Place_Keyword: Louisiana Place_Keyword: Maine Place_Keyword: Maryland Place_Keyword: Massachusetts Place_Keyword: Michigan Place_Keyword: Minnesota Place_Keyword: Mississippi Place_Keyword: Missouri Place_Keyword: Montana Place_Keyword: Nebraska Place_Keyword: Nevada Place_Keyword: New Hampshire Place_Keyword: New Jersey Place_Keyword: New Mexico Place_Keyword: New York Place_Keyword: North Carolina Place_Keyword: North Dakota Place_Keyword: Ohio Place_Keyword: Oklahoma Place_Keyword: Oregon Place_Keyword: Pennsylvania Place_Keyword: Rhode Island Place_Keyword: South Carolina Place_Keyword: South Dakota Place_Keyword: Tennessee Place_Keyword: Texas Place_Keyword: Utah Place_Keyword: Vermont Place_Keyword: Virginia Place_Keyword: Washington Place_Keyword: West Virginia Place_Keyword: Wisconsin Place_Keyword: Wyoming Place_Keyword: Puerto Rico Place_Keyword: Virgin Islands Place_Keyword: U.S. Virgin Islands Place_Keyword: Guam Place_Keyword: Northern Mariana Islands Access_Constraints: None Use_Constraints: None. Acknowledgment of the National Atlas of the United States of America and (or) the U.S. Geological Survey would be appreciated in products derived from these data. Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Margaret G. Hopper Contact_Organization: U.S. Geological Survey Contact_Address: Address_Type: Mailing address Address: MS966, Box 25046, Denver Federal Center City: Denver State_or_Province: CO Postal_Code: 80225-0046 Country: USA Contact_Voice_Telephone: 303-273-8564 Contact_Facsimile_Telephone: 303-273-8600 Contact_Electronic_Mail_Address: hopper@usgs.gov Data_Set_Credit: The following U.S. Geological Survey scientists contributed to this map layer: A. Tarr, M. Hopper, J. Dewey, M. McKeever, and N. Trevor. Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: The attribute table was manually checked for unreasonable attribute values for depth and magnitude. Logical_Consistency_Report: No formal tests for logical consistency were performed on this map layer, principally because the map layer contains attribute values that were arrived at by either or both quantitative (i.e. instrumental) and qualitative (i.e. historical) methods. Earthquakes that occurred prior to the introduction of seismological instrumentation are known only from written records, such as newspapers, books and journals, and diaries, which often may provide contradictory information that has to be carefully examined and weighed. As seismographs became more common in the early 1960's, the origin time and location were both more precisely and accurately determined but the compilation and evaluation of intensity reports was, and still is, a process that involves considerable subjectivity. As a result, all attributes associated with a given earthquake should be considered provisional and subject to further revision based on acquisition of new information and use of new analytical methods. Completeness_Report: This map layer contains information on significant, historical earthquakes that caused deaths, property damage, geological effects, or that were experienced by populations in the epicentral area, for the United States, Puerto Rico, the U.S. Virgin Islands, Guam, and the Northern Mariana Islands. These data are limited to the best estimates of earthquake locations and to attributes such as magnitude and maximum intensity. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: 100 meter is the nominal precision of the reported instrumentally located coordinate values but accuracy is considerably less. Accuracy depends upon numerous factors including imprecision of the velocity model of the earth, uneven distribution of seismic stations, and imprecisions in the computational algorithm. Following initial proofreading of the input data file, a preliminary map of the locations of the earthquakes was produced which was examined for gross errors in spatial location. Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: Although depths are reported to the nearest 1 kilometer, the accuracy is considerably less owing to uncertainties in the velocity model of the Earth, uneven distribution of seismic stations, and imprecisions in the computational algorithm. Lineage: Source_Information: Source_Citation: Citation_Information: Originator: Stover, Carl W. Originator: Coffman, Jerry L. Publication_Date: 1993 Title: Seismicity of the United States, 1568-1989 (Revised) Edition: 1 Online_Linkage: Series_Information: Series_Name: Professional Paper Issue_Identification: 1527 Publication_Information: Publication_Place: Washington, DC Publisher: U.S. Geological Survey Type_of_Source_Media: Paper Source_Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 1568 Ending_Date: 1989 Source_Currentness_Reference: Ground condition Source_Citation_Abbreviation: Seismicity of the United States Source_Contribution: Principal source of earthquake locations and attributes. Source_Information: Source_Citation: Citation_Information: Originator: U.S. Geological Survey Publication_Date: 200411 Title: Preliminary Determination of Epicenters (PDE) Online_Linkage: Type_of_Source_Media: Online Source_Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 1973 Ending_Date: 20040131 Source_Currentness_Reference: Ground condition Source_Citation_Abbreviation: PDE Source_Contribution: Supplemental source of earthquake locations and attributes. Source_Information: Source_Citation: Citation_Information: Originator: J.L. Coffman (ed.) Originator: C.A. von Hake (ed.) Originator: C.W. Stover (ed.) Publication_Date: 1982 Title: Earthquake History of the United States Publication_Information: Publication_Place: Boulder, CO Publisher: National Oceanic and Atmospheric Administration and U.S. Geological Survey Type_of_Source_Media: Paper Source_Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 1638 Ending_Date: 1980 Source_Currentness_Reference: Ground condition Source_Citation_Abbreviation: EHUS1982 Source_Contribution: Supplemental source of earthquake locations and attributes. Source_Information: Source_Citation: Citation_Information: Originator: J.G. Tanner Originator: J.B. Shepherd Publication_Date: 1997 Title: Project catalogue and seismic hazard maps, Seismic hazard in Latin America and the Caribbean Online_Linkage: Type_of_Source_Media: Online Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1997 Source_Currentness_Reference: Publication date Source_Citation_Abbreviation: MIDAS-IPGH Source_Contribution: Supplemental source of earthquake locations and attributes. Process_Step: Process_Description: Data for the years 1568 to 1989, from Seismicity of the United States, were combined with Preliminary Determination of Epicenters data for 1990 to 2004. EHUS1982 and MIDAS-IPGH were used to compile information for additional locations or for years not covered by the other sources. The resulting text file was loaded into ArcView and converted to a shapefile. Three records for Puerto Rico were dropped because they did not include values for longitude and latitude. Source_Used_Citation_Abbreviation: Seismicity of the United States Source_Used_Citation_Abbreviation: PDE Source_Used_Citation_Abbreviation: EHUS1982 Source_Used_Citation_Abbreviation: MIDAS-IPGH Process_Date: 200411 Spatial_Data_Organization_Information: Indirect_Spatial_Reference: U.S. Department of Commerce, 1987, Codes for the Identification of the States, the District of Columbia and the Outlying Areas of The United States, and Associated Areas (Federal Information Processing Standard 5-2): Washington, DC, National Institute of Standards and Technology. Direct_Spatial_Reference_Method: Point Point_and_Vector_Object_Information: SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: Point Point_and_Vector_Object_Count: 5351 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Geographic: Latitude_Resolution: 0.000278 Longitude_Resolution: 0.000278 Geographic_Coordinate_Units: Decimal degrees Geodetic_Model: Horizontal_Datum_Name: North American Datum of 1983 Ellipsoid_Name: GRS1980 Semi-major_Axis: 6378137.0 Denominator_of_Flattening_Ratio: 298.257222 Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: Significant United States Earthquakes (described by Quksigx020.dbf) Entity_Type_Definition: Earthquakes within or near to the United States that caused deaths, property damage, or geological effects, or that were experienced by populations in the epicentral area. These events occurred between 1568 and January 2004. Entity_Type_Definition_Source: National Atlas of the United States Attribute: Attribute_Label: Shape Attribute_Definition: The representation of the entity in the data. Attribute_Definition_Source: National Atlas of the United States Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Point Enumerated_Domain_Value_Definition: 0-dimensional element Enumerated_Domain_Value_Definition_Source: ESRI GIS software Attribute: Attribute_Label: Quksigx020 Attribute_Definition: Internal feature number. Attribute_Definition_Source: National Atlas of the United States Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 1 Range_Domain_Maximum: 5387 Attribute: Attribute_Label: Quake_id Attribute_Definition: Internal feature number. Attribute_Definition_Source: National Atlas of the United States Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 1 Range_Domain_Maximum: 5390 Attribute: Attribute_Label: Year Attribute_Definition: The year when the earthquake occurred. Attribute_Definition_Source: National Atlas of the United States Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 1568 Range_Domain_Maximum: 2004 Attribute: Attribute_Label: Month Attribute_Definition: The month when the earthquake occurred. Attribute_Definition_Source: National Atlas of the United States Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 1 Range_Domain_Maximum: 12 Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: -9999 Enumerated_Domain_Value_Definition: The month of the event is unknown. Enumerated_Domain_Value_Definition_Source: National Atlas of the United States Attribute: Attribute_Label: Day Attribute_Definition: The day when the earthquake occurred. Attribute_Definition_Source: National Atlas of the United States Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 1 Range_Domain_Maximum: 31 Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: -9999 Enumerated_Domain_Value_Definition: The day of the event is unknown. Enumerated_Domain_Value_Definition_Source: National Atlas of the United States Attribute: Attribute_Label: Hour Attribute_Definition: The GMT hour of the day when the earthquake occurred, on a 24-hour clock. Attribute_Definition_Source: National Atlas of the United States Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0 Range_Domain_Maximum: 23 Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: -9999 Enumerated_Domain_Value_Definition: The hour of the event is unknown. Enumerated_Domain_Value_Definition_Source: National Atlas of the United States Attribute: Attribute_Label: Minute Attribute_Definition: The minute of the hour when the earthquake occurred. Attribute_Definition_Source: National Atlas of the United States Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0 Range_Domain_Maximum: 59 Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: -9999 Enumerated_Domain_Value_Definition: The minute of the event is unknown. Enumerated_Domain_Value_Definition_Source: National Atlas of the United States Attribute: Attribute_Label: Second Attribute_Definition: The second of the minute when the earthquake occurred. Attribute_Definition_Source: National Atlas of the United States Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.010 Range_Domain_Maximum: 59.970 Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: -9999.000 Enumerated_Domain_Value_Definition: The second of the event is unknown. Enumerated_Domain_Value_Definition_Source: National Atlas of the United States Attribute: Attribute_Label: Location Attribute_Definition: The name of the town, city, physical feature, or other describable location near to the earthquake event. Attribute_Definition_Source: National Atlas of the United States Attribute_Domain_Values: Unrepresentable_Domain: There is no predefined set of valid location names. Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Enumerated_Domain_Value_Definition: No location description is available. Enumerated_Domain_Value_Definition_Source: National Atlas of the United States Attribute: Attribute_Label: Longitude Attribute_Definition: The longitude of earthquake's epicenter in decimal degrees. Attribute_Definition_Source: National Atlas of the United States Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -179.990 Range_Domain_Maximum: 180.000 Attribute: Attribute_Label: Latitude Attribute_Definition: The latitude of earthquake's epicenter in decimal degrees. Attribute_Definition_Source: National Atlas of the United States Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 12.686 Range_Domain_Maximum: 68.689 Attribute: Attribute_Label: Depth_km Attribute_Definition: The depth of earthquake's focus in kilometers. A value of 0 may indicate the depth is unknown. Attribute_Definition_Source: National Atlas of the United States Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0 Range_Domain_Maximum: 274 Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: -9999 Enumerated_Domain_Value_Definition: The depth is unknown. Enumerated_Domain_Value_Definition_Source: National Atlas of the United States Attribute: Attribute_Label: Mb_gs Attribute_Definition: The body wave magnitude of the earthquake as reported by the U.S. Geological Survey. A body wave is a seismic wave that travels through the Earth's inner layers. Attribute_Definition_Source: National Atlas of the United States Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 3.400 Range_Domain_Maximum: 7.000 Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: -9999.000 Enumerated_Domain_Value_Definition: The body wave magnitude is unknown. Enumerated_Domain_Value_Definition_Source: National Atlas of the United States Attribute: Attribute_Label: Ms_gs Attribute_Definition: The surface wave magnitude of the earthquake as reported by the U.S. Geological Survey. A surface wave is a seismic wave that travels along the Earth's surface. Attribute_Definition_Source: National Atlas of the United States Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 3.100 Range_Domain_Maximum: 8.500 Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: -9999.000 Enumerated_Domain_Value_Definition: The surface wave magnitude is unknown. Enumerated_Domain_Value_Definition_Source: National Atlas of the United States Attribute: Attribute_Label: Other_mag1 Attribute_Definition: The magnitude of the earthquake as reported by the source identified in Ref1. The type of magnitude is described by the attribute Type1. Attribute_Definition_Source: National Atlas of the United States Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 2.080 Range_Domain_Maximum: 9.240 Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: -9999.000 Enumerated_Domain_Value_Definition: No additional magnitude measurement is available. Enumerated_Domain_Value_Definition_Source: National Atlas of the United States Attribute: Attribute_Label: Type1 Attribute_Definition: The type of magnitude recorded in the attribute Other_mag1, as defined by the source identified in Ref1. Attribute_Definition_Source: National Atlas of the United States Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: FA Enumerated_Domain_Value_Definition: The magnitude given in Other_mag1 is an estimated body wave magnitude. It is commonly computed from the felt area for earthquakes which occurred before seismic instruments were in general use. Enumerated_Domain_Value_Definition_Source: National Atlas of the United States Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: MD Enumerated_Domain_Value_Definition: The magnitude given in Other_mag1 is based on the duration or coda length of the earthquake vibration. Enumerated_Domain_Value_Definition_Source: National Atlas of the United States Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: ML Enumerated_Domain_Value_Definition: The magnitude given in Other_mag1 is the local magnitude, which is also known as the original "Richter" magnitude. Enumerated_Domain_Value_Definition_Source: National Atlas of the United States Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: MW Enumerated_Domain_Value_Definition: The magnitude given in Other_mag1 is the moment magnitude. It is the measure of total energy released by an earthquake. Enumerated_Domain_Value_Definition_Source: National Atlas of the United States Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Mn Enumerated_Domain_Value_Definition: The magnitude given in Other_mag1 is the local or regional magnitude. It is the body wave magnitude using the Lg wave. Enumerated_Domain_Value_Definition_Source: National Atlas of the United States Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Ms Enumerated_Domain_Value_Definition: The magnitude given in Other_mag1 is the surface wave magnitude. A surface wave is a seismic wave that travels along the Earth's surface. Enumerated_Domain_Value_Definition_Source: National Atlas of the United States Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Mw Enumerated_Domain_Value_Definition: The magnitude given in Other_mag1 is the moment magnitude. Enumerated_Domain_Value_Definition_Source: National Atlas of the United States Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: UK Enumerated_Domain_Value_Definition: The magnitude type for the magnitude given in Other_mag1 is unknown. Enumerated_Domain_Value_Definition_Source: National Atlas of the United States Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: mb Enumerated_Domain_Value_Definition: The magnitude given in Other_mag1 is the body wave magnitude. A body wave is a seismic wave that travels through the Earth's inner layers. Enumerated_Domain_Value_Definition_Source: National Atlas of the United States Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: mbLg Enumerated_Domain_Value_Definition: The magnitude given in Other_mag1 is the local or regional magnitude. It is the body wave magnitude using the Lg wave. Enumerated_Domain_Value_Definition_Source: National Atlas of the United States Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Enumerated_Domain_Value_Definition: The type of magnitude given in Other_mag1 is unknown. The value came from Coffman, Jerry L., and von Hake, Carl A., 1973, Earthquake History of the United States: U.S. Dept. of Commerce, National Oceanic and Atmospheric Administration, Publication 41-1, Revised Edition (Through 1970). Enumerated_Domain_Value_Definition_Source: National Atlas of the United States Attribute: Attribute_Label: Ref1 Attribute_Definition: A code identifying the source for the magnitude given in Other_mag1. The list of sources is provided in the text file quksigx_references.txt. Attribute_Definition_Source: National Atlas of the United States Attribute_Domain_Values: Unrepresentable_Domain: There is no predefined set of valid reference codes. Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Enumerated_Domain_Value_Definition: No reference information is available. Enumerated_Domain_Value_Definition_Source: National Atlas of the United States Attribute: Attribute_Label: Other_mag2 Attribute_Definition: The magnitude of the earthquake as reported by the source identified in Ref2. The type of magnitude is described by the attribute Type2. Attribute_Definition_Source: National Atlas of the United States Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 2.900 Range_Domain_Maximum: 8.400 Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: -9999.000 Enumerated_Domain_Value_Definition: No additional magnitude measurement is available. Enumerated_Domain_Value_Definition_Source: National Atlas of the United States Attribute: Attribute_Label: Type2 Attribute_Definition: The type of magnitude recorded in the attribute Other_mag2, as defined by the source identified in Ref2. Attribute_Definition_Source: National Atlas of the United States Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: FA Enumerated_Domain_Value_Definition: The magnitude given in Other_mag2 is an estimated body wave magnitude. It is commonly computed from the felt area for earthquakes which occurred before seismic instruments were in general use. Enumerated_Domain_Value_Definition_Source: National Atlas of the United States Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: MD Enumerated_Domain_Value_Definition: The magnitude given in Other_mag2 is based on the duration or coda length of the earthquake vibration. Enumerated_Domain_Value_Definition_Source: National Atlas of the United States Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: ME Enumerated_Domain_Value_Definition: The magnitude given in Other_mag2 is the energy magnitude which is the radiated energy of the earthquake. Enumerated_Domain_Value_Definition_Source: National Atlas of the United States Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: ML Enumerated_Domain_Value_Definition: The magnitude given in Other_mag2 is the local magnitude, which is also known as the original "Richter" magnitude. Enumerated_Domain_Value_Definition_Source: National Atlas of the United States Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: MW Enumerated_Domain_Value_Definition: The magnitude given in Other_mag2 is the moment magnitude. It is the measure of total energy released by an earthquake. Enumerated_Domain_Value_Definition_Source: National Atlas of the United States Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Mn Enumerated_Domain_Value_Definition: The magnitude given in Other_mag2 is the local or regional magnitude. It is the body wave magnitude using the Lg wave. Enumerated_Domain_Value_Definition_Source: National Atlas of the United States Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Ms Enumerated_Domain_Value_Definition: The magnitude given in Other_mag2 is the surface wave magnitude. A surface wave is a seismic wave that travels along the Earth's surface. Enumerated_Domain_Value_Definition_Source: National Atlas of the United States Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Mw Enumerated_Domain_Value_Definition: The magnitude given in Other_mag2 is the moment magnitude. Enumerated_Domain_Value_Definition_Source: National Atlas of the United States Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: UK Enumerated_Domain_Value_Definition: The magnitude type for the magnitude given in Other_mag2 is unknown. Enumerated_Domain_Value_Definition_Source: National Atlas of the United States Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: mb Enumerated_Domain_Value_Definition: The magnitude given in Other_mag2 is the body wave magnitude. A body wave is a seismic wave that travels through the Earth's inner layers. Enumerated_Domain_Value_Definition_Source: National Atlas of the United States Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: mbLg Enumerated_Domain_Value_Definition: The magnitude given in Other_mag2 is the local or regional magnitude. It is the body wave magnitude using the Lg wave. Enumerated_Domain_Value_Definition_Source: National Atlas of the United States Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Enumerated_Domain_Value_Definition: The type of magnitude given in Other_mag2 is unknown. The value came from Coffman, Jerry L., and von Hake, Carl A., 1973, Earthquake History of the United States: U.S. Dept. of Commerce, National Oceanic and Atmospheric Administration, Publication 41-1, Revised Edition (Through 1970). Enumerated_Domain_Value_Definition_Source: National Atlas of the United States Attribute: Attribute_Label: Ref2 Attribute_Definition: A code identifying the source for the magnitude given in Other_mag2. The list of sources is provided in the text file quksigx_references.txt. Attribute_Definition_Source: National Atlas of the United States Attribute_Domain_Values: Unrepresentable_Domain: There is no predefined set of valid references. Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Enumerated_Domain_Value_Definition: No reference information is available Enumerated_Domain_Value_Definition_Source: National Atlas of the United States Attribute: Attribute_Label: Mmio Attribute_Definition: Modified Mercalli Intensity (MMI), where the integer value represents the Roman numeral designation of the MMI intensity. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: F Enumerated_Domain_Value_Definition: The earthquake was felt but no Modified Mercalli Intensity was assigned. Enumerated_Domain_Value_Definition_Source: National Atlas of the United States Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: 2 Enumerated_Domain_Value_Definition: An earthquake felt only by a few persons at rest, especially on upper floors of buildings. Delicately suspended objects may swing. Enumerated_Domain_Value_Definition_Source: Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: 3 Enumerated_Domain_Value_Definition: An earthquake felt quite noticeably by persons indoors, especially on upper floors of buildings. Many people do not recognize it as an earthquake. Standing motor cars may rock slightly. Vibration similar to the passing of a truck. Duration estimated in some cases. Enumerated_Domain_Value_Definition_Source: Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: 4 Enumerated_Domain_Value_Definition: An earthquake felt indoors by many, outdoors by few during the day. At night, some awakened. Dishes, windows, doors disturbed; walls make cracking sound. Sensation like heavy truck striking building. Standing motor cars rocked noticeably. Enumerated_Domain_Value_Definition_Source: Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: 5 Enumerated_Domain_Value_Definition: An earthquake felt by nearly everyone; many awakened. Some dishes, windows broken. Unstable objects overturned. Pendulum clocks may stop. Enumerated_Domain_Value_Definition_Source: Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: 6 Enumerated_Domain_Value_Definition: An earthquake felt by all; many frightened. Some heavy furniture moved; a few instances of fallen plaster. Damage slight. Enumerated_Domain_Value_Definition_Source: Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: 7 Enumerated_Domain_Value_Definition: An earthquake causing negligible damage in buildings of good design and construction; slight to moderate in well-built ordinary structures; considerable damage in poorly built or badly designed structures; some chimneys broken. Noticed by persons driving motor cars. Enumerated_Domain_Value_Definition_Source: Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: 8 Enumerated_Domain_Value_Definition: An earthquake causing slight damage in specially designed structures; considerable in ordinary substantial buildings with partial collapse. Damage great in poorly built structures. Fall of chimneys, factory stacks, columns, monuments, walls. Heavy furniture overturned. Enumerated_Domain_Value_Definition_Source: Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: 9 Enumerated_Domain_Value_Definition: An earthquake causing considerable damage in specially designed structures; well-designed frame structures thrown out of plumb. Damage great in substantial buildings, with partial collapse. Buildings shifted off foundations. Enumerated_Domain_Value_Definition_Source: Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: 10 Enumerated_Domain_Value_Definition: An earthquaking causing destruction of some well-built wooden structures; most masonry and frame structures destroyed with foundations. Railroad rails bent. Enumerated_Domain_Value_Definition_Source: Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: 11 Enumerated_Domain_Value_Definition: An earthquake where few, if any (masonry) structures remain standing. Bridges destroyed. Railroad rails bent greatly. Enumerated_Domain_Value_Definition_Source: Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: 12 Enumerated_Domain_Value_Definition: An earthquake where damage is total. Lines of sight and level distorted. Objects thrown into the air. Enumerated_Domain_Value_Definition_Source: Attribute: Attribute_Label: Felt_area Attribute_Definition: The area, in square kilometers, in which the earthquake was felt. Attribute_Definition_Source: National Atlas of the United States Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: <1,000 Range_Domain_Maximum: 5,000,000 Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Enumerated_Domain_Value_Definition: The area in which the earthquake was felt is unknown. Enumerated_Domain_Value_Definition_Source: National Atlas of the United States Attribute: Attribute_Label: Source Attribute_Definition: The primary source of the earthquake information. Attribute_Definition_Source: National Atlas of the United States Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: EHUS1982 Enumerated_Domain_Value_Definition: Coffman, J.L., von Hake, C.A., and Stover, C.W., 1982, Earthquake History of the United States: U.S. National Oceanic and Atmospheric Administration and U.S. Geological Survey, Publication No. 41-1, revised edition, [through 1980], 258p. Enumerated_Domain_Value_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: MIDAS-IPGH Enumerated_Domain_Value_Definition: Tanner, J.G. and Shepherd, J.B., 1997, Project catalogue and seismic hazard maps, Seismic hazard in Latin America and the Caribbean: Panamerican Institute of Geography and History, v. 1, 143 p. Enumerated_Domain_Value_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: PDE Enumerated_Domain_Value_Definition: Preliminary Determination of Epicenters, a list of earthquakes located by the National Earthquake Information Center of the U.S. Geological Survey and its predecessors in the U.S. Coast and Geodetic Survey, the National Oceanic Survey, and the Environmental Research Laboratories of the Department of Commerce. The PDE is comprised of final hypocenter and magnitude computations by the USGS NEIC published in monthly lists several months after the events. Enumerated_Domain_Value_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: SUS Enumerated_Domain_Value_Definition: Stover, Carl W., and Coffman, Jerry L., 1993a, Seismicity of the United States, 1568-1989 (Revised): U.S. Geological Survey Professional Paper 1527, 418 p. Enumerated_Domain_Value_Definition_Source: U.S. Geological Survey Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: Earth Science Information Center, U.S. Geological Survey Contact_Address: Address_Type: Mailing address Address: 507 National Center City: Reston State_or_Province: VA Postal_Code: 20192 Contact_Voice_Telephone: 1-888-ASK-USGS (1-888-275-8747) Contact_Voice_Telephone: 703-648-5920 Contact_Instructions: In addition to the address above there are other ESIC offices throughout the country. A full list of these offices is at . Distribution_Liability: Although these data have been processed successfully on a computer system at the U.S. Geological Survey, no warranty expressed or implied is made by the U.S. Geological Survey regarding the utility of the data on any other system, nor shall the act of distribution constitute any such warranty. No responsibility is assumed by the U.S. Geological Survey in the use of these data. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: ESRI Shapefile Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: Digital_Form: Digital_Transfer_Information: Format_Name: SDTS Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: Fees: There is no charge for the map layer. Metadata_Reference_Information: Metadata_Date: 20060620 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Gita Urban-Mathieux Contact_Organization: National Atlas of the United States Contact_Address: Address_Type: Mailing address Address: 12201 Sunrise Valley Dr Address: MS 561 City: Reston State_or_Province: VA Postal_Code: 20192 Contact_Voice_Telephone: 703-648-5175 Contact_Electronic_Mail_Address: atlasmail@usgs.gov Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998 Metadata_Security_Information: Metadata_Security_Classification_System: None Metadata_Security_Classification: Unclassified Metadata_Security_Handling_Description: None