Misc. Reference Manual Pages NCSN.CATALOG(5Q) NAME NCSN.CATALOG, ncsn.catalog, calnet.catalog - description of NCSN catalog file format (Y2K compliant) DESCRIPTION The catalog format is the summary line of the phase file format. The CUSPID is appended to the end of the summary line for use in retrieving the digital waveform data. SUMMARY HEADER FORMAT YEAR 2000 * indicates a new/revised field Start Fortran Col. Len. Format Data _____ ____ ______ ______ 1 4 I4 Year. * 5 8 4I2 Month, day, hour and minute. 13 4 F4.2 Origin time seconds. 17 2 F2.0 Latitude (deg). First character must not be blank. 19 1 A1 S for south, blank otherwise. 20 4 F4.2 Latitude (min). 24 3 F3.0 Longitude (deg). 27 1 A1 E for east, blank otherwise. 28 4 F4.2 Longitude (min). 32 5 F5.2 Depth (km). 37 3 F3.2 Magnitude from maximum S amplitude from NCSN stations * 40 3 I3 Number of P & S times with final weights greater than 0.1. 43 3 I3 Maximum azimuthal gap, degrees. 46 3 F3.0 Distance to nearest station (km). 49 4 F4.2 RMS travel time residual. 53 3 F3.0 Azimuth of largest principal error (deg E of N). 56 2 F2.0 Dip of largest principal error (deg). 58 4 F4.2 Size of largest principal error (km). 62 3 F3.0 Azimuth of intermediate principal error. 65 2 F2.0 Dip of intermediate principal error. 67 4 F4.2 Size of intermediate principal error (km). 71 3 F3.2 Coda duration magnitude from NCSN stations. * 74 3 A3 Event location remark. (See table 7 below). 77 4 F4.2 Size of smallest principal error (km). 81 2 2A1 Auxiliary remarks (See note below). 83 3 I3 Number of S times with weights greater than 0.1. 86 4 F4.2 Horizontal error (km). 90 4 F4.2 Vertical error (km). 94 3 I3 Number of P first motions. * 97 4 F4.1 Total of NCSN S-amplitude mag weights ~number of readings.* 101 4 F4.1 Total of NCSN duration mag weights ~number of readings. * 105 3 F3.2 Median-absolute-difference of NCSN S-amp magnitudes. 108 3 F3.2 Median-absolute-difference of NCSN duration magnitudes. 111 3 A3 3-letter code of crust and delay model. (See table 8 below). 114 1 A1 Last authority for earthquake N=NCSC (USGS), B=UC Berkeley. SunOS 5.7 Last change: 1999/09/30 1 Misc. Reference Manual Pages NCSN.CATALOG(5Q) 115 1 A1 Most common P & S data source code. (See table 1 below). 116 1 A1 Most common duration data source code. (See cols. 68-69) 117 1 A1 Most common amplitude data source code. 118 1 A1 Coda duration magnitude type code 119 3 I3 Number of valid P & S readings (assigned weight > 0). 122 1 A1 S-amplitude magnitude type code 123 1 A1 "External" magnitude label or type code. Typically "L" (=ML) computed by UCB. This information is not computed by Hypoinverse, but passed along 124 3 F3.2 "External" magnitude. 127 3 F3.1 Total of the "external" magnitude weights (~ number of readings). 130 1 A1 Alternate amplitude magnitude label or type code (i.e. L for ML calculated by Hypoinverse from Wood Anderson amplitudes). 131 3 F3.2 Alternate amplitude magnitude. 134 3 F3.1 Total of the alternate amplitude mag weights ~no. of readings. 137 10 I10 Event identification number 147 1 A1 Preferred magnitude label code chosen from those available. 148 3 F3.2 Preferred magnitude, chosen by the Hypoinverse PRE command. 151 4 F4.1 Total of the preferred mag weights (~ number of readings). * 155 1 A1 Alternate coda duration magnitude label or type code (i.e. Z). 156 3 F3.2 Alternate coda duration magnitude. 159 4 F4.1 Total of the alternate coda duration magnitude weights. * 163 1 A1 Version number of information: 0=25 pick; 1=Final EW with MD; 2=ML added, etc. 0-9, then A-Z. Hypoinv. passes this through. 164 1 A1 Version # of last human review. blank=unreviewed, 1-9, A-Z. MAGNITUDES The NCSN computes several types of magnitudes, depending on the type of data available, the period of network operation, and the size of the earthquake. The "primary" magnitudes are those that are available for most events, particularly events less than magnitude 3.5. Because the primary magni- tudes saturate for events above M4.5, the NCSN also computes "alternate" magnitudes (coda or amplitude) from low-gain instruments that generally remain on-scale during large earthquakes. We also provide "external" local magnitudes (ML) computed by UC Berkeley, as well as magnitudes that are determined by real-time systems from the amplitude of the initial P-wave amplitudes. Because each magnitude is appropriate for a given magnitude range, we provide a "preferred" magnitude in columns 147- 154. The logic for selecting the preferred magnitude is shown in the table below. It attempts to provide the most reliable estimate for each earthquake. Note that variations in magnitude estimates are expected when using different methods. There is no "correct" magnitude. SunOS 5.7 Last change: 1999/09/30 2 Misc. Reference Manual Pages NCSN.CATALOG(5Q) The alternate magnitude fields are filled only if the magni- tudes were calculated. Formerly, alternate magnitudes could appear in either of the positions in cols 123-136. Currently, each magnitude is in a fixed position. Alternate magnitudes use the label codes given by the Hypoinverse FC2 and XC2 commands, or the external label code. CODE EXPLANATION PRIMARY MAGNITUDES D Coda duration magnitude (Eaton, BSSA, v.82 p.533, 1992). Uses all components. Formerly code E. X S-wave maximum amplitude magnitude. Eaton, BSSA, v.82 p.533, 1992). Uses all components. EXTERNAL MAGNITUDES L Local magnitude as computed by UC Berkeley ALTERNATE MAGNITUDES L Local magnitude computed by NCSN from UC Berkeley Wood Anderson amplitudes. Z Low gain (Z component) coda duration magnitude of Hirshorn and Lindh (1989?). P Initial P-wave amplitude magnitude. Uses all com- ponents. Not yet in use. G Low-gain initial P-wave amplitude magnitude. Uses low- gain Z component. Not yet in use. A S-wave maximum amplitude magnitude for which amplitude data are lost. PREFERRED MAGNITUDE SELECTION ORDER Order label label mag sum_mag_wts mag_MAD min # min type code column columns columns columns readings mag ---------------------------------------------------------------------- 1. L 123 124-126 127-129 N/A 4 4.0 "external" 2. Z 155 156-158 159-193 N/A 6 4.0 "alternate" 3. D 118 71- 73 101-105 108-110 1 0.0 "primary" 4. X or A 122 37- 39 97-100 105-107 1 0.0 "primary" SunOS 5.7 Last change: 1999/09/30 3 Misc. Reference Manual Pages NCSN.CATALOG(5Q) 5. L 130 131-133 134-136 N/A 4 4.0 "alternate" 6. L 123 124-126 127-129 N/A 0 0.0 "external" 7. L 130 131-133 134-136 N/A 0 0.0 "alternate" AUXILIARY EVENT REMARKS (Summary card cols. 81-82) Assigned by analyst (col. 81): Q Quarry blast R Seismic refraction/reflection explosion. Terminator line contains known origin time, location (see EVENT TERMINATOR FORMAT below) N NTS blast. Terminator line contains known origin time, location (see EVENT TERMINATOR FORMAT below) F Felt M Multiple event (Two events close in time and space are each marked M) B Blast (HVO) T Tremor associated (HVO) L Long period (HVO) Assigned by HYPOINVERSE (col. 82): # 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. Table 1. DATA SOURCE CODES (_ stands for a blank space). 1-letter Meaning Original 6-letter codes code ---- ------- ----------------------- 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 W Earthworm (real time) SunOS 5.7 Last change: 1999/09/30 4 Misc. Reference Manual Pages NCSN.CATALOG(5Q) 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 A Digitized at seismometer (e.g. Nanometrics, DST units) ? 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 SunOS 5.7 Last change: 1999/09/30 5 Misc. Reference Manual Pages NCSN.CATALOG(5Q) 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 SunOS 5.7 Last change: 1999/09/30 6 Misc. Reference Manual Pages NCSN.CATALOG(5Q) 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. SunOS 5.7 Last change: 1999/09/30 7 Misc. Reference Manual Pages NCSN.CATALOG(5Q) 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 NCSN, 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: SunOS 5.7 Last change: 1999/09/30 8 Misc. Reference Manual Pages NCSN.CATALOG(5Q) 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. AUTHOR Fred Klein, USGS, Menlo Park, CA. Modified for NCEDC by Doug Neuhauser, UC Berkeley Seismological Laboratory. 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