SUMMARY HEADER FORMAT ------- ------ ------ Cols. Format Data _____ ______ ____ 1-10 5I2 Year, month, day, hour and minute. 11-14 F4.2 Origin time seconds. 15-16 F2.0 Latitude (deg). 17 A1 S for south, blank otherwise. 18-21 F4.2 Latitude (min). 22-24 F3.0 Longitude (deg). 25 A1 E for east, blank otherwise. 26-29 F4.2 Longitude (min). 30-34 F5.2 Depth (km). 35-36 F2.1 Primary amplitude magnitude XMAG1. 37-39 I3 Number of P & S times with final weights greater than 0.1. 40-42 I3 Maximum azimuthal gap. 43-45 F3.0 Distance to nearest station (km). 46-49 F4.2 RMS travel time residual. 50-52 F3.0 Azimuth of smallest principal error (deg E of N). 53-54 F2.0 Dip of smallest principal error (deg). 55-58 F4.2 Magnitude of smallest principal error (km). 59-61 F3.0 Azimuth of intermediate principal error. 62-63 F2.0 Dip of intermediate principal error. 64-67 F4.2 Magnitude of intermediate principal error (km). 68-69 F2.1 Primary coda magnitude FMAG1. 70-72 A3 Event location remark. (See table 7 below). 73-76 F4.2 Magnitude of largest principal error (km). 77-78 2A1 Auxiliary remarks (See note below). 79-80 I2 Number of S times with weights greater than 0.1. 81-84 F4.2 Horizontal error (km). 85-88 F4.2 Vertical error (km). 89-90 I2 Number of P first motions. 91-93 F3.1 Total of amplitude magnitude weights. 94-96 F3.1 Total of duration magnitude weights. 97-99 F3.2 Median-absolute-difference of amplitude magnitudes. 100-02 F3.2 Median-absolute-difference of duration magnitudes. 103-05 A3 3-letter code of crust and delay model. (See table 8 below). 106 A1 Crust model type code (H or T). 107 A1 Most common P & S data source code. (See table 1 below). 108 A1 Most common FMAG data source code. 109 A1 Most common XMAG data source code. 110 A1 Primary coda magnitude type code (from FC1 command). 111-13 I3 Number of valid P & S readings (assigned weight > 0). 114 A1 Primary amplitude magnitude type code (from XC1 command). The following are written only if secondary magnitudes are present. Secondary magnitudes may appear in either position and use the label codes given by the FC2 and XC2 commands. The code L is for ML calculated by the USGS from Berkeley amplitudes, and B is for ML from the Berkeley catalog. 115 A1 Secondary magnitude label or type code. 116-18 F3.2 Secondary magnitude. 119-21 F3.1 Total of the secondary magnitude weights. 122 A1 Secondary magnitude label or type code. 123-25 F3.2 Secondary magnitude. 126-28 F3.1 Total of the secondary magnitude weights. MAGNITUDES ---------- The magnitudes and their label codes are: E Primary coda magnitude. FMAG of Eaton (1991). Uses all components. X Primary amplitude magnitude. Jerry Eaton's XMAG. Uses all components. Secondary magnitudes: L Local magnitude computed from UC Berkeley Wood Anderson amplitudes. B Local magnitude from UC Berkeley's catalog. Magnitudes no longer used in CALNET catalog: T Lapse time coda magnitude of Michaelson (1990) from high gain verticals. Z Low gain (Z component) magnitude of Hirshorn and Lindh (1989?). AUXILIARY EVENT REMARKS (Summary card cols. 77-78) ----------------------- Assigned by analyst (col. 77): Q Quarry blast (or NTS explosion) N NTS blast F Felt Assigned by HYPOINVERSE (col. 78): * Location had convergence problems such as maximum number of iterations or failure to reach a minimum RMS. - Depth was poorly constrained and was held fixed at its current value. Tables 1-6 were taken from Klein et al., Seismic Station Data for Northern California and Surrounding Areas, USGS Open File Report 88-448, 1988. Table 1. DATA SOURCE CODES -------------------------- (_ stands for a blank space). 1-letter code Meaning Original 6-letter codes ---- ------- ----------------------- H Hand timed H_____ ______ 1_____ CALNEW _ALNEW, " CALDVL CALHEL R Main RTP XP P-remark. May find: R_____ 2_____, " CALRTP P Prototype RTP YP P-remark. May find: CALPRO O Motorola RTP CALMOT 1 CUSP Tustin A/D #1 CALT1_ 2 CUSP Tustin A/D #2 CALT2_ _ALT2_ E CUSP-Eclipse digitized CALECL _ALECL F CUSP-VAX/750 digitized CALFMT CALFM3 3 Pasadena Tustin #1 CITT1_ 4 Pasadena Tustin #2 CITT2_ 5 Pasadena 11/34 online CITN34 6 Pasadena 11/34 online CITS34 7 Pasadena Nova/Eclipse CITD1_ 8 Pasadena VAX digitized CITFMT C Pasadena hand timed CITHEL CITNEW _ITNEW CITPNK M Readings from Mexico CITMEX J Jerry Eaton hand timed ______ U U. Nevada Reno readings RENO__ _ENO__ RENO_1 B UC Berkeley readings Y Woodward-Clyde readings G CDMG readings L LLL readings S USC readings D Haliburton digital, Parkfield T Tera Corp. or PG&E readings ? Unknown or undefined Table 7. REGIONS BY 3-LETTER CODE --------------------------------- Regions labeled with '%' are aggregates of smaller regions and should not appear on the summary cards. Code Name region number ---- ---- ------------- ALM Lake Almanor 58 ALU Alum Rock 21 ANN Anno Nuevo 34 AUB Auburn 60 BAK Bakersfield 75 BAR Bartlett Springs Fault 49 BIT Bitterwater Valley 12 BLM Black Mountain 2 BRC Basin & Range Calif % 64 BUS Busch Fault 5 BVL Bear Valley 11 CAS Casa Diablo Mtn. (VOT) 95 CHA Chalk Bluffs (VOT) 97 CHV Chalfant Valley (BRC) 79 COA Coalinga 31 CON Concord Fault 18 COS Coso Range (BRC) 81 CRV Ciervo Hills 30 CYN Coyote North 23 CYS Coyote South 24 DAN Danville 19 DEL Del Norte 52 DEV Death Valley (BRC) 85 DOM Resurgent Dome (LVC) 91 EMO East Moat (LVC) 89 EUR Eureka 51 GAR Garlock Fault 83 GEY Geysers 43 GLA Glass Mtn. (MOB) 77 GOL Gold Hill 15 GRN Greenville Fault 26 GVL Green Valley Fault 46 HAM Mt. Hamilton 27 HAY Hayward Fault 16 HCF Hilton Crk. Flt. (LVC) 93 HOL Hollister 9 INC Inyo Craters (LVC) 86 IWV Indian Wells Val. (BRC) 82 JQN San Joaquin Valley 54 KAI Kaiser Peak 65 KLA Klamath Mountains 55 KON Konocti Bay 44 LAS Lassen 57 LOM Loma Prieta 3 LVC Long Valley Caldera % 66 MAA Maacama Fault 48 MAM Mammoth Mtn. (LVC) 92 MAR Marin 41 MCA Mono Caldera (MOB) 74 MEN Mendocino Escarpment 50 MID Middle Mountain 14 MIS Mission Fault 17 MOB Mono Basin % 63 MOD Modoc Plateau 72 MOL Mono Lake (MOB) 78 MON Monterey Bay 35 MOR Mt. Morrison (RSM) 98 NAP West Napa Fault 45 NEV Nevada 73 NMO North Moat (LVC) 88 ORE Oregon 71 ORO Oroville 59 ORT Ortigaleta Fault 28 OWV Owens Valley (BRC) 84 PAI Paicines 10 PAN Panoche Pass 29 PAR Point Arena 47 PIN Pinnacles 8 PON Pacific Ocean N 70 POS Pacific Ocean S 103 QUI Quiensabe 25 ROB Paso Robles 38 ROG Rogers Creek Fault 42 RSM Red Slate Mountain % 68 RVL Round Valley (VOT) 96 SAC Sacramento Valley 53 SAL Salinas Valley 36 SAR Sargent Fault 4 SBA Santa Barbara 94 SCA Southern Calif. 69 SCV Santa Clara Valley 33 SFB South S.F. Bay 32 SFL San Felipe 22 SFP S.F. Peninsula 1 SHA Shasta 56 SHE Sherwin Lakes (RSM) 99 SIL Silver Peak (RSM) 100 SIM Simmler 40 SJB San Juan Bautista 6 SLA Slack Canyon 13 SMO South Moat (LVC) 90 SSM San Simeon 39 STN Stone Canyon 7 SUN Sunol 20 SUR Big Sur (Hosgri Fault) 37 VOT Volcanic Tableland % 67 WAK Walker Lane 62 WCN Wheeler Crest No. (RSM) 101 WCS Wheeler Crest So. (RSM) 102 WHI White Mountains (BRC) 80 WMO West Moat (LVC) 87 WWF White Wolf Falut 76 YOS Yosemite 61 Table 8. MULTIPLE VELOCITY MODELS FOR HYPOINVERSE ------------------------------------------------- Different crustal models and station delay sets are used for regions in Northern California. Events falling between regions will use a combination of 2 or 3 models. Two regions have different models for either side of the San Andreas Fault. An event in a dual-model region uses separate models for stations on different sides of the fault regardless of which side of the fault the epicenter is on. The Loma Prieta region uses model LOM for stations on the west (Pacific) side and model LON for stations on the east (North American) side. The code LOM labels all events that use these two models. The Bear Valley region uses model GAB for stations on the Gabilan (west) side and model DIA for stations on the Diablo (east) side. The three Parkfield areas use identical models but slightly different sets of station delays. A description of the models and the regions assigned to them is available from Fred Klein. Code Name Delay Source of original model How status derived ---- ---- ------ ------------------------ ------- AUB Auburn 2 Eaton & Simirenko (OFR 80-604, 1980) test&modify BAE Bartlett Spr east 2 Castillo pers. comm. (1991) VELEST BAR Bartlett Spr Fault 2 Castillo pers. comm. (1991) VELEST BAS Basin & Range 0 averaged Prodehl (Prof Pap 1034, 1979) refract COA Coalinga 2 Eaton OFR 85-44 (1985) test&modify CON Concord-Calaveras 2 Klein pers. comm. (1991) VELEST COY Coyote Lake 2 Reasenberg & Ellsworth (JGR 1982) VELEST CST Central Coast 2 Poley & Eaton pers. comm. test&modify DIA Diablo-Bear Valley 2 Dietz pers. comm. & VELEST (west) Walter & Mooney (BSSA 1982) refract EBY East Bay (unused) 2 Olson pers. comm. & Ellsworth & Marks OFR (1980) VELEST GAB Gabilan-Bear Valley 2 Dietz pers. comm. & VELEST (east) Walter & Mooney (BSSA 1982) refract GEY Geysers 2 Eberhart-Phillips & Oppenheimer (JGR 1984) VELEST HAY Hayward Fault 2 Klein pers. comm. (1990) VELEST LAS Lassen 2 S. Walter pers. comm. VELEST LEW Mt. Lewis 2 Klein pers. comm. (1990) VELEST LIV Livermore-Antioch 2 Klein pers. comm. (1991) VELEST LOM Loma Prieta (west) 2 Dietz & Ellsworth (GRL 1990) VELEST LON Loma Prieta (east) 2 Dietz & Ellsworth (GRL 1990) VELEST MAA Maacama Fault 2 Castillo pers. comm. (1991) VELEST MAM Mammoth Lakes 2 Kissling (PhD thesis 1986?) & refract & Cockerham & Kissling pers. comm. inversion MAN Maacama North 2 Castillo pers. comm. (1991) VELEST MEN Mendocino 2 Magee pers. comm. (1991) VELEST MOR Morgan Hill 2 Cockerham & Eaton (USGS Bulletin 1639, 1987) VELEST NBY North S.F. Bay 2 Eberhart-Phillips & Oppenheimer (JGR 1984) VELEST NCG N. Calif. gradient 1 default model derived from: NCA N.Cal layer (unused)1 standard CALNET, Eaton pers. comm. test&modify PAR Parkfield (unused) 2 Poley & Eaton pers. comm. test&modify PEN S.F. Peninsula 2 Olson (Proc. Rec. Crus. Mvmts. 1987?) VELEST PGH Park.-Gold Hill 2 Poley & Eaton pers. comm. test&modify PMM Park.-Middle Mtn. 2 same as PGH. test&modify PSM Park.-Simmler 2 same as PGH test&modify PTA Pt Arena, Ft Bragg 2 Castillo pers. comm. (1991) VELEST SCA Southern Calif. 0 Jones pers. comm. refract? SHA Shasta & Oregon 0 average from Zucca et al. (JGR 1986) refract SJB San Juan Bautista 2 Moths pers. comm. VELEST TRA Transverse Ranges 0 Prodehl PP-1034 (1979) refract TRE Tres Pinos 1 Dietz pers. comm. & VELEST Walter & Mooney (BSSA 1982) refract WAL Walker Pass 1 Jones & Dollar (BSSA 1986) test&modify The status codes for the station delays are: 0 No station delays at present. 1 Delays are from original investigator for layer model. 2 Delays refined for present region and gradient model from original delays.