QUICK REFERENCE
(Full Metadata link)

EARTHQUAKES


Earthquakes:   	Identification Information
Originator:  National Earthquake Information Center World Data Center
		Date:  1994
		Title:  National Earthquake Information Center World Data Center for Seismology, 
Denver
		Purpose:  unknown
		Abstract:  This data base provides information on earthquakes from 2100 B.C. to the 
present. The data base contains earthquakes with known magnitude values between 0.1 and 9.9. Earthquakes that have no computed magnitude values are also included in the data base. Users of micro-earthquake data (magnitude less than or equal to 0.0) should contact institutions that operate seismograph networks in their area of interest. In reality, there are very few events with magnitude less than 2.0 in the data base.


		Access Constraints:  none  
		Use Constraints:  It is ultimately the user's responsibility to assess the accuracy and 
completeness of a data-set extracted from the data base and to determine if these are sufficient for the purposes to which the data-set would be applied.

		Ordering Instructions:  available online, see online linkage below

      		Contact Person:  Madeleine Zirbes
		Contact Organization:  U.S. Geological Survey; National Earthquake Information Center
        		City:  Denver
       		State or Province: Colorado
        		Postal Code: 
       	 	Country:  USA

Online Linkage: http://wwwneic.cr.usgs.gov/neis/epic/database.html

		Entity and Attribute Information (table heading explanations)
		Shape:  ArcView file type
		Cat:  Contributing source, or authority:  
			PDE:  Preliminary Determinations of Epicenters, Monthly Listing
			PDE-Q:  Daily listing, known as Quick Epicenter Determinations (QED)
			PDE-W:  PDE Weekly Listing
			SISRA:  Project SISRA, Earthquake Mitigation Program in the Andean Region
		Year:  Year earthquake occurred
		Mo:  Month earthquake occurred
		Da:  Day earthquke occurred
		Orig_time:  (Orig Time in Screen Format)  Given in Coordinated Universal Time (UTC)
		Lat:  Latitude
		Lon:  Longitude
		Dep:  Depth: value given in kilometers
		Mag:  Magnitude, a logarithmic measure of the "size" of an earthquake, is related to the 
energy released as seismic waves at the focus of an earthquake.
		Maginfo:  The contributed magnitude field; consists of 7 characters:
        			positions 1-2 = magnitude scale; and postions 3-7 = organization source; if 
blank, the source is the same as the one shown under the catalog source column.

Iefm:  Information: Dots are used in place of blanks to aid in the distinction between the 
columns.  Broken into Intensity, EFF, FPS, and MO
Dtsvnwg:  Information: Dots are used in place of blanks to aid in the distinction between 
the columns.  Broken into Diastroph., Tsunami, Seiche, Volcanism, NonTect, Waves, and Misc.
Dist:  Radial distance: On radius searches, the distance in kilometers between designated 
input point and earthquake location. The distance value is truncated to the whole kilometer.