NCSN.PHASE(5Q) Misc. Reference Manual Pages NCSN.PHASE(5Q) NAME NCSN.PHASE, ncsn.phase, calnet.phase - description of NCSN phase file format (Y2K compliant) DESCRIPTION The NCSN phase data is stored in shadow card format. Shadow format is a kludge developed to store the most essen- tial event and station data for local earthquakes in Cali- fornia. It is a good example of incremental growth. Its only virtues are that it exists, several programs support it, and the NCSN catalog is presently in this format. Shadow format has old style HYPO71 phase cards and HYPOINVERSE archive formats at its core. The main phase card fields are still in their original places in shadow format, and some addi- tional raw data fields have been added where blank spaces occurred before. The phase format grew into the HYPOINVERSE archive format by filling in blanks and adding a summary line with the location and other event data as a header at the beginning of each event. The next addition occurred when we needed places to store RTP and CUSP coda duration fit parameters and data to locate the CUSP archive tape and the seismograms on it. These data were put on "shadow" cards following each line of the HYPOINVERSE archive format. The structure of a full shadow format file is as follows. Like a HYPO71 phase file, a file may contain any number of events. Events within a file are in chronological order. All shadow cards begin with a $ sign (items 2, 3, 5 and 7 below). There is one header (items 1, 2, 3) and one termina- tor (items 6 and 7) per event. There may be any number of stations (items 4 and 5). (1) A summary line with location and other event data; (2) The first summary shadow begins with "$1" and has reference time and archive tape information for CUSP events (the fields are empty for RTP events); (3) Additional and optional event shadows may follow, presently to a maximum of 4, beginning with "$2", etc. Data for each station (of which there may be any number) follow and consist of pairs of lines: (4) Phase lines with data for individual stations; SunOS 5.5.1 Last change: 1999/09/30 1 NCSN.PHASE(5Q) Misc. Reference Manual Pages NCSN.PHASE(5Q) (5) Phase lines are followed by one shadow line with coda duration parameters and seismogram recovery data; The event ends with: (6) A terminator card with an ID number and an optional trial hypocenter; and (7) The terminator shadow, presently mostly blank. There are standard subsets of these full shadow files. Stripping out all shadow cards (lines beginning with $) results in a HYPOINVERSE archive file. This form omits coda duration fit parameters and seismogram pointers. Thus pre- RTP and pre-CUSP data exist without shadow ($) cards. Keep- ing only the summary header produces a catalog file of sum- mary data suitable for programs like SELECT and QPLOT. Many of the fields are calculated by a location program, and some of those are unique to HYPOINVERSE. Events not pro- cessed by HYPOINVERSE, or processed with a subset of HYPOIN- VERSE options may not have all fields defined. The FORTRAN formats below are to be used for reading the fields. Decimal points may or may not appear, and if not, their places are implied by the format as indicated. 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). SunOS 5.5.1 Last change: 1999/09/30 2 NCSN.PHASE(5Q) Misc. Reference Manual Pages NCSN.PHASE(5Q) 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. 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, SunOS 5.5.1 Last change: 1999/09/30 3 NCSN.PHASE(5Q) Misc. Reference Manual Pages NCSN.PHASE(5Q) 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. 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?). SunOS 5.5.1 Last change: 1999/09/30 4 NCSN.PHASE(5Q) Misc. Reference Manual Pages NCSN.PHASE(5Q) 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" 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. SunOS 5.5.1 Last change: 1999/09/30 5 NCSN.PHASE(5Q) Misc. Reference Manual Pages NCSN.PHASE(5Q) - Depth was poorly constrained and was held fixed at its current value. SUMMARY SHADOW FORMAT Most of these fields hold CUSP related data. If the event was only on the RTP and CUSP did not digitize the event, all fields up to col. 80, except the "$1" identifier are blank. * indicates a new/revised field % indicates a moved field Cols Len. Format Data ____ ___ ______ ____ 1-2 2 '$1' Designates Shadow Summary Card 3-6 4 I4 Reference time: year 7-10 4 2I2 Reference time: month, day 11-14 4 2I2 Reference time: hour, minute 15-20 6 F6.3 Reference time: seconds First Arkive Tape: 21-23 3 A3 Network Identifier (e.g. CAL, CIT, HVO) 24 1 1X blank 25-34 10 I10 Arkive tape number 35-44 10 I10 Arkive event id number 45-50 6 I6 File number on Arkive tape Second Arkive Tape (rare): 51-53 3 A3 Network Identifier 54 1 1X blank 55-64 10 I10 Arkive tape number 65-74 10 I10 Arkive event id number 75-80 I6 File number on Arkive tape 81-83 3 F3.2 S-wave amplitude magnitude (like cols. 35-36 of summary card) * 84-86 3 F3.2 Coda duration magnitude (like cols. 68-69 of summary card) * 87-90 4 F4.3 L1 norm for primary P amplitude magnitude $ 91-94 4 F4.3 L1 norm for secondary P amplitude magnitude $ $ Denotes optional fields that may not be filled. STATION ARCHIVE FORMAT YEAR 2000 The following line appears for each station. If CUSP digi- tized the event, an entry may appear for saved traces such as time code or stations from which no information was meas- ured. The unique designation of a station name has expanded SunOS 5.5.1 Last change: 1999/09/30 6 NCSN.PHASE(5Q) Misc. Reference Manual Pages NCSN.PHASE(5Q) with time, reflecting the increase in sensor types and con- flicts with station names in use by other networks. We for- mally define a station name with 10 letters as the concate- nation of the 5-letter site code, 2-letter network code, and 3-letter component code. Hypoinverse optionally uses 1 or 3 letter component codes, and both are listed in the print file. NCSN practice is to use the 3-letter code for station matching, and the 1-letter code as a convenience label only. The number of decimal places N is implied by the fortran format (ie F5.N). * indicates an enlarged/moved field + indicates a new field the weight-out code for P&S times was redundant and has been eliminated. Start Fortran Col. Len. Format Data ____ ___ ______ ______ 1 5 A5 5-letter station site code, left justified. * 6 2 A2 2-letter seismic network code. * 8 1 1X Blank * 9 1 A1 One letter station component code. 10 3 A3 3-letter station component code. * 13 1 1X Blank * 14 2 A2 P remark such as "IP". 16 1 A1 P first motion. 17 1 I1 Assigned P weight code. 18 4 I4 Year. * 22 8 4I2 Month, day, hour and minute. 30 5 F5.2 Second of P arrival. 35 4 F4.2 P travel time residual. 39 3 F3.2 P weight actually used. 42 5 F5.2 Second of S arrival. 47 2 A2 S remark such as "ES". 49 1 1X Blank 50 1 I1 Assigned S weight code. 51 4 F4.2 S travel time residual. 55 7 F7.2 Amplitude (Peak-to-peak in Develocorder or paper mm). * 62 2 I2 Amp units code. 0=PP mm, 1=0 to peak mm (UCB stations). + 64 3 F3.2 S weight actually used. 67 4 F4.2 P delay time. 71 4 F4.2 S delay time. 75 4 F4.1 Epicentral distance (km). 79 3 F3.0 Emergence angle at source. 82 1 I1 Amplitude magnitude weight code. 83 1 I1 Duration magnitude weight code. 84 3 F3.2 Period at which the amplitude was measured for this station. 87 1 A1 1-letter station remark. (See table 4 below). 88 4 F4.0 Coda duration in seconds. 92 3 F3.0 Azimuth to station in degrees E of N. 95 3 F3.2 Duration magnitude for this station. * SunOS 5.5.1 Last change: 1999/09/30 7 NCSN.PHASE(5Q) Misc. Reference Manual Pages NCSN.PHASE(5Q) 98 3 F3.2 Amplitude magnitude for this station. * 101 4 F4.3 Importance of P arrival. 105 4 F4.3 Importance of S arrival. 109 1 A1 Data source code (See table 1 below). 110 1 A1 Label code for duration magnitude from FC1 or FC2 command. 111 1 A1 Label code for amplitude magnitude from XC1 or XC2 command. STATION SHADOW FORMAT The shadow format differs for RTP and CUSP data. Columns 1-41 are the same for both. You can discriminate between RTP and CUSP shadows before reading them by looking on the phase card. RTP phases will have a data source (col. 92) of R, P, or M and (usually) corresponding P remarks (cols. 5-6) of XP, YP and ZP. The coda duration fit parameters result from a fit of the coda envelope to the form 10**A * t**-Q where 10**A is in units of digital counts and t is in seconds after the P time. If Q is fixed at 1.8 (QFIX), the resulting A is AFIX below. If both are fit simultaneously, AFREE and QFREE are stated below. For more on coda duration fitting see Carl Johnson's thesis (Caltech 1979) or Hirshorn et al., Real Time Signal Duration Magnitudes from Low-gain Short Period Seismometers, USGS Open File Report 87-630, 1987. For RTP data, the AMH tuple provides data for cols 44-50. Up to six time/amplitude data pairs describing the coda duration decay are written. See Al Lindh for a description of these data. RTP AND CUSP Cols. Format Data ----- ------ ---- 1-2 '$ ' Designator for shadow phase card. 3-5 I3 No. of (averaged) amplitude windows used in coda duration fit algorithm. 6-10 F5.2 AFIX (see above). 11-15 F5.2 QFIX (see above). 16-20 F5.2 AFREE (see above). 21-25 F5.2 QFREE (see above). 26-30 F5.2, 1X RMS of L1 fit to coda duration amplitude windows. 32-35 A4 Coda phase descriptor (See table below). 36-40 I5, 1X Coda duration time (seconds) as measured directly i.e., not recalculated. CUSP ONLY SunOS 5.5.1 Last change: 1999/09/30 8 NCSN.PHASE(5Q) Misc. Reference Manual Pages NCSN.PHASE(5Q) 42-45 'AHS ' Amplitude descriptor, peak S-wave half amplitude value as computed for MCD tuple. 46-50 I5 Amplitude corresponding to phase card cols 42-45 51 '1' First/Second arkive tape source 52-53 I2 CUSP set number for these phase data 54-57 I4 CUSP pin number for these phase data 58-67 I10 Offset: number of words in Arkive file before first word of the seismogram 68-77 F10.5 Toffset: offset time of first data point for this seismogram, relative to reference time in cols 4-19 of shadow summary card. 78-84 I7 Nwords: number of words in this seismogram 85-92 F8.6 Digint: digitization interval, seconds RTP ONLY 42-43 'PH' Amplitude descriptor, peak P-wave half amplitude 44-45 A1,I1 Phase descriptor and weight assigned by RTP to the amplitude it reports; e.g. P0. Weight code is the number of the first 3 P peaks that clipped. From indices (2,3) of the PHASE attribute of the AMH tuple. 46-50 I5 Amplitude corresponding to cols 42-45, from the AMP attribute of AMH tuple. PERiod attribute is available but is not written out. 51-57 I3,I4 Time-amplitude data pair #1 58-64 I3,I4 Time-amplitude data pair #2 65-71 I3,I4 Time-amplitude data pair #3 72-78 I3,I4 Time-amplitude data pair #4 79-85 I3,I4 Time-amplitude data pair #5 86-92 I3,I4 Time-amplitude data pair #6 93-95 F3.2 P amplitude magnitude. * 96-98 F3.2 Weight of magnitude used in L1 norm (0.0-9.9) * 99-102 F4.3 L1 norm. The event magnitude is from the station with the minimum norm. * 103 A1 P amplitude magnitude type code. * * Denotes new fields that may not be defined in older catalog files. 4-LETTER CODA DESCRIPTOR (columns 32-35 of shadow card) First letter: P Normal termination of coda; RTP codas < 144 sec. S Short or premature termination of coda; recalculated RTP codas > 144 sec. N Noisy coda with early termination. RTP gave a negative duration time. Second letter: SunOS 5.5.1 Last change: 1999/09/30 9 NCSN.PHASE(5Q) Misc. Reference Manual Pages NCSN.PHASE(5Q) T Bad coda duration computed using the wrong clipping value (CUSP only). S Normal case of coda duration longer than S-P time. P P coda; duration less than S-P time. Third letter: _ (space) Did not do a coda fit. X Coda duration is from a fixed L1 norm fit to the average absolute amplitudes. R Coda duration is from a free L1 norm fit to the average absolute amplitudes. N Normal coda, no fits were necessary. Fourth letter 0-4 Coda weight (0=full weight, 4=no weight). EVENT TERMINATOR FORMAT Normally the event terminator will contain only the event ID number. It signals the end of an event because the sta- tion code is blank. Fields are reserved for an optional trial hypocenter or fixed depth control. HYPOINVERSE may use either this trial hypocenter or the hypocenter on the event header. See the HYPOINVERSE documentation for more informa- tion on trial hypocenters. If the event is designated as N=NTS shot or R=refraction shot, the "trial" information described below are the known parameters, with an assumed depth of zero. 1-4 4X,2X Must be blank. 7-10 2I2 Trial hour and minute. 11-14 F4.2 Trial second. 15-16 F2.0,1X Trial latitude (deg). 18-21 F4.2 Trial latitude (min). 22-24 F3.0,1X Trial longitude (deg). 26-29 F4.2 Trial longitude (deg). 30-34 F5.2 Trial depth (a negative value fixes depth). 35-62 28X blank 63-72 I10 ID number EVENT TERMINATOR SHADOW 1-2 '$ ' Shadow card designator 3-62 60X blank 63-72 I10 ID number Tables 1-6 were modified 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). SunOS 5.5.1 Last change: 1999/09/30 10 NCSN.PHASE(5Q) Misc. Reference Manual Pages NCSN.PHASE(5Q) 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) 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 2. NETWORK OWNER/OPERATOR CODES N was the 1-letter net code formerly used by Menlo Park. In the former usage, it was the fourth letter of the 4-letter station code. The IRIS code is now the official net code used with station site codes. In addition to regular NCSN stations, NC is also used for defunct nets for which the the USGS archives phase data. IRIS NEIS ORG Operator N code code code - ---- ---- ---- -------- A* Special purpose, i.e a tie-breaker SunOS 5.5.1 Last change: 1999/09/30 11 NCSN.PHASE(5Q) Misc. Reference Manual Pages NCSN.PHASE(5Q) B BK BRK UCB UC Berkeley, including digital seismic network BDSN C CI PAS GSP Caltech-USGS Pasadena C CI GSPM Formerly operated by Menlo, now by Pasadena C CI PAS CIT Caltech, original pre-USGS stations C* TS CIT Caltech terrascope (BAR,GSC,ISA,MLA,PAS,PFO,SBC,SVD) D SN GSD Southern Great Basin Net (UN Reno formerly USGS Denver) F PX UCS Parkfield net (Duke/UC Santa Barbara/Berkeley/USGS) G NC CDMG CDM Calif. Div. of Mines and Geology L NC LAC LLL Lawrence Livermore Labs, Livermore net L LL LAC LLL Lawrence Livermore Labs, NTS net M NC MNLO GSM USGS Menlo M NC MNLO GSMP Formerly operated by Pasadena, now by Menlo O UW UWA Univ. of Washington Oregon stations P NC 5DY,DIG,SMO,CEN USGS Menlo portables P NC (Non-USGS portables use P and UNR, CIT etc.) R NN REN UNR W great basin/E Sierra Nevada (Univ. of Nevada Reno) S SC USC USC Univ. of Southern Calif. (may have been LA ?) T NC TER Terra Corp. (Mendocino area) U UU UUT University of Utah regional network W WR CDWR DWR Calif. Div. of Water Resources X MX ECX ECX Mexican national network, CICESE, Ensenada, Mexico Y NC WCC Woodward-Clyde & PG&E (Sierra foothills) Y PG PGE Pacific Gas & Electric Co. (Diablo Canyon) AZ UCSD Anza network, UC San Diego SD? SD UC San Diego, So. Calif. Earthquake Center * The letter A is used instead of C for the station Calabasas: CALA = CALA-TS (Calabasas); whereas CALC = CAL-CI (California City) Table 3a. 3-LETTER COMPONENT CODE DEFINITIONS (Menlo & Pasadena codes) (For SEED channel code definition, see appendix A of the SEED manual) The channel identifier distinguishes different components at the same station site. The naming condenses all component information into 3 letters which are all that are available in the CUSP format. Unlike SEED, CUSP does not have space for separate gain and transmission path codes and condenses this information into the 3-letter code. The first letter describes the sensor type and frequency band, the second the gain and the third the sensor orientation or direction. All network channels must use these standard codes to allow ready identification of channels. For example, the standard short-period vertical network station uses the code VHZ. The equivalent NCSN 1-letter code is V. In some contexts, the 3-letter codes can be abbreviated to the older 1-letter codes. SunOS 5.5.1 Last change: 1999/09/30 12 NCSN.PHASE(5Q) Misc. Reference Manual Pages NCSN.PHASE(5Q) Sensor type and frequency band (first letter of 3-letter code) V short period seismometer (i.e. L4C) A accelerometer or FBA B broadband or Strekheisen (i.e. STS-2) W Wood-Anderson L long period seismometer (used for digitally transmitted terrascope data) D dilatometer T time trace H short period seismometer (often downhole) X Experimental Gain (including telemtry type and dynamic range) (second letter) H high gain (12-24 db attenuation for USGS seismometers) M medium gain [proposed, presently unused] L low gain (42-48 db attenuation for USGS seismometers) F very low gain (72 db attenuation for USGS seismometers) S strong motion (very very low gain) D high gain, digital telemetry, high dynamic range Orientation (third letter; these are the same as the SEED codes) Z vertical E east-west N north-south 1,2,3 non-traditional orientations I or blank no orientation, isotropic compenent (dilatometer, hydrophone, time trace) Table 3b. 1-LETTER AND 3-LETTER COMPONENT (CHANNEL) CODES The 1-letter and/or the 3-letter codes are used by Menlo Park & Pasadena. The SEED code maps 1-to-1 and is used for international data exchange. 1 -3- SEED V VHZ EHZ vertical high gain velocity (0-30 db attenuation, gen. 12 or 18) Z VLZ ELZ vertical low gain " (36-48 db attenuation, gen. 48) E VLE ELE east horizontal " (36-48 db attenuation, gen. 42) N VLN ELN north horizontal " " VHE EHE east horizontal high gain velocity (0-30 db attenuation) VHN EHN north horizontal high gain velocity " F VFZ ENZ very low gain velocity vertical (54-80 db atten., gen. 72) G VFN ENN " north " H VFE ENE " east " SunOS 5.5.1 Last change: 1999/09/30 13 NCSN.PHASE(5Q) Misc. Reference Manual Pages NCSN.PHASE(5Q) U VDZ EDZ hi gain seismometer, high dynamic range digital (DST), vertical W VDN EDN hi gain seismometer, high dynamic range digital (DST), north X VDE EDE hi gain seismometer, high dynamic range digital (DST), east D VL1 EL1 additional rotated velocity horizontal O VL2 EL2 " P DDI EVS dilatometer, digital telemetry (gain 1) P DSI EVS dilatometer (gain 1) Q DFI EVF " (gain 12) R DLI EVL " (gain 50) S DHI EVH " (gain 200) T T AT time code (CUSP recording) L WLN ELN NS Wood-Anderson torsion (2100X - 2800X) incl. synthetic amps. M WLE ELE EW Wood-Anderson " " X WFN ENN NS lo-gain torsion (BKY 700X, CIT 100X) Y WFE ENE EW lo-gain torsion (BKY 700X, CIT 100X) I ADZ HGZ vert force-balance-accel., digital (2.0g v. v. low gain) J ADN HGN north " " K ADE HGE east " " I ASZ HGZ vert force-balance-accel. (2.0g v. v. low gain) J ASN HGN north " " K ASE HGE east " " A AFZ HOZ vert " (0.2g very low gain) B AFN HON north " " C AFE HOE east " " I ASZ HLZ vert Berkeley FBA-23 accelerometer J ASN HLN north " " K ASE HLE east " " The following codes are for the Terrascope or Berkeley Streckheisen stations: 1 HHZ HHZ vert broad band (analog telemetry, CUSP recording, 80-100 sps) 2 HHN HHN north " " 3 HHE HHE east " " 4 BHZ BHZ vert very broad band (digital telemetry, 20 samples/sec) 5 BHN BHN north " " 6 BHE BHE east " " 7 HLZ HLZ vert " " low gain (100 sps) 8 HLN HLN north " " 9 HLE HLE east " " We use the following SEED seismometer instrument codes not in the SEED document: SunOS 5.5.1 Last change: 1999/09/30 14 NCSN.PHASE(5Q) Misc. Reference Manual Pages NCSN.PHASE(5Q) N Very low gain seismometer O Alternate (higher) gain accelerometer D High gain, high dynamic range seismometer Table 4. STATION REMARK CODES (_ stands for a blank space). 1-letter Meaning Original 3-letter codes code ---- ------- ----------------------- A Calibration card CAL B Coda read to backgrd. BGC BGK BCK C Clipped CLP CMX D Dead trace DED OUT NNE DWK _NE NE_ N/E E Emergent VVE F F-P uncertain FPQ FP? G Guessed time GES GUS EST M Max amplitude read MAX MX_ N Noisy trace NOI NSE NOY NOE P Amplitude is of P wave PMX S Spiky trace SPI SPK T Cross-talk _CF CF_ CF? CFQ W Weak signal WEK WKE VWK Table 5. 1-LETTER REGION CODE (First letter of N.Calif. USGS stations) (Regions in parentheses are not used in the normal name code convention). A Auburn region N Napa Valley region B San Juan Bautista region O Oroville region C Calaveras region P Parkfield region D Mojave desert Q (Southern Nevada) E (Elsinore fault region) R (Riverside region) F (San Fernando and Los Angeles basins) S Santa Barbara region G Geysers region T (Tejon pass region) H Hollister region U (Northern Nevada (UNR net)) I (Imperial valley) V Oregon J San Jose region W Walker pass region K Klamath mountain region X (Mexico) L Lassen and Shasta region Y M Melones and Mammoth regions Z Table 6. 2-LETTER PORTABLE NET CODES The 4-letter station code for portables consists of the 2- letter net code, a 1-digit number or letter (number of the station within the portable deployment), and the letter 'P' SunOS 5.5.1 Last change: 1999/09/30 15 NCSN.PHASE(5Q) Misc. Reference Manual Pages NCSN.PHASE(5Q) for portable. The catalog does not have data from a few of the portable deployments listed below. Region or name Dates Operator -------------- ----- -------- BA, BB, BC, BD, BE, BF, BL & BM Bear Valley 7/74-1/75 USGS 10-day BI Bishop 1978 CA Long Valley Caldera 3/84 USGS CH Chalfant Valley 7/86 USGS CL Long Valley 6-9/81 CDMG CO Coalinga 5-9/83 USGS CP Coalinga GEOS 5/83 USGS digital GEOS CS Coso Hot Springs 5-6/77 USGS Centipede DA, DB, DD, DE, DF, DG, DH, DI, DJ, DK, DL, DM, DS: Dry Lake centipede (BV) 9-11/78 USGS DC Dos Cuadras Ocean Bot. 12/75-1/76 USGS OBS DU Durwood Meadows 10-11/83 USGS 5-day EU Eureka & Cape Mendocino 11-12/80 USGS GE Geysers 8-12/81 USGS HP Bear Valley 7-9/67 USGS JA Long Valley 1/83 USGS KE Kettleman Hills 8/85 USGS LA Lassen Park 7-10/80 USGS 5-day LI Livermore 1-2/80 LLL MC Mono Craters 7-8/82 USGS MD Mount Diablo 6-7/70 USGS MH Morgan Hill GEOS 4-5/84 USGS digital GEOS MI Morgan Hill 5-day 4-5/84 USGS ML Mammoth Lakes 5-6/80 USGS MM " " " Caltech MN " " " UNR MO " " " USGS digital GEOS MP " " 78-82 CDMG MQ Mammoth Mountain 6/23-27/89 USGS - GEOS MR Mammoth 8/82 USGS OR Oroville 8/75-76 DWR OW " 8/75 Woodward Clyde PB Point Buchon 12/80-5/81 USGS PK Parkfield PM Point Mugu 2-4/73 USGS RO Rocklin 6/78 CDMG RV Round Valley 11/84 USGS SA San Andreas 1-5/70 USGS SB San Juan Bautista 5-6/81 USGS SC Santa Cruz Mtns. 9/67 USGS SH Shasta 8/78 USGS SP Shasta (Stevens Pass) 8/78 USGS SR Santa Rosa 10/69 USGS ST Shasta (tennant) 1/81 USGS SU Point Sur 1-2/84 USGS UA UNR Mammoth 10/78 UNR SunOS 5.5.1 Last change: 1999/09/30 16 NCSN.PHASE(5Q) Misc. Reference Manual Pages NCSN.PHASE(5Q) UB UNR Mammoth 10-11/79 UNR UD UNR Round Valley 11/84 UNR UE UNR Chalfant Valley 7/86 UNR UF UNR Mammoth 5/82 UNR UO Union Oil, Medicine Lake 8/84 Union Oil 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 SunOS 5.5.1 Last change: 1999/09/30 17 NCSN.PHASE(5Q) Misc. Reference Manual Pages NCSN.PHASE(5Q) 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 SunOS 5.5.1 Last change: 1999/09/30 18 NCSN.PHASE(5Q) Misc. Reference Manual Pages NCSN.PHASE(5Q) 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 SunOS 5.5.1 Last change: 1999/09/30 19 NCSN.PHASE(5Q) Misc. Reference Manual Pages NCSN.PHASE(5Q) (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: 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. SunOS 5.5.1 Last change: 1999/09/30 20