Table of Contents for this Document File: Name of File Contributing Source File directory/location Information on the region covered Variable Table Format File Sample Data Variable File Additional Documentation ==================================================================== ==================================================================== ==================================== Variable Table The variable table contains a list of parameters contained in the data as well as information on the existence of histograms which can be viewed in GeoVu. File mexico.tab for this catalog follows ==================================== DATA SET TITLE: mexico PRINCIPAL INVESTIGATOR: CONTRIBUTING ORGANIZATION: NGDC DATA FILE: mexico.bin NUMBER OF RECORDS: 39315 ASCII FILE SIZE: 3223830 BINARY FILE SIZE: 3066570 SUMMARY: This is the composite catalog for the region of Mexico and the east-central Pacific Ocean from the NGDC earthquake data base. The time covered is: 1523 to 1995 The region covered is: 14 N to 30 N 80 W to 150 W This composite catalog comes from many sources. Many events are identified with multiple listings for different sources. 1. VARIABLE NAME HISTOGRAM NAME 2. ASCII FORMAT BINARY FORMAT NO. & MIN/MAX VALUES Stat End Type Prc Stat End Type Prc Min. Max. #nonzero source SOURCE.CST 1 3 char 0 1 3 char 0 BCI USE 39315 century_and_year CENTURY_.LST 4 8 short 0 57 58 short 0 1522 1994 39315 month MONTH.LST 9 10 short 0 59 60 short 0 1 12 39304 day DAY.LST 11 12 short 0 61 62 short 0 1 31 39300 hour HOUR.LST 13 14 short 0 63 64 short 0 1 23 37651 minute MINUTE.LST 15 16 short 0 65 66 short 0 1 59 38567 second SECOND.LST 17 19 short 1 67 68 short 1 1 59 38291 latitude_abs NO HISTOGRAM 20 24 long 3 NOT IN BINARY latitude_ns NO HISTOGRAM 25 25 char 0 NOT IN BINARY longitude_abs NO HISTOGRAM 26 31 long 3 NOT IN BINARY longitude_ew NO HISTOGRAM 32 32 char 0 NOT IN BINARY depth DEPTH.LST 33 35 short 0 69 70 short 0 4 928 34492 mb_magn MB_MAGN.LST 36 38 short 2 14 15 short 2 1 7 8966 MB NO HISTOGRAM 39 40 constant 0 NOT IN BINARY flag_isoseismal FLAG_ISO.CST 41 43 char 0 16 18 char 0 FPS PDE 39 intensity INTENSIT.CST 44 44 char 0 19 19 char 0 1 X 222 flags_ngdc FLAGS_NG.CST 45 50 char 0 20 25 char 0 Q FT 41 flag_diastrophic FLAG_DIA.CST 45 45 char 0 26 26 char 0 F F 2 flag_tsunami FLAG_TSU.CST 46 46 char 0 27 27 char 0 Q T 40 flag_seiche FLAG_SEI.CST 47 47 char 0 28 28 char 0 S S 1 flag_volcanism FLAG_VOL.CST 48 48 char 0 29 29 char 0 0 0 0 flag_non_tectonic FLAG_NON.CST 49 49 char 0 30 30 char 0 0 0 0 flag_infrasonic FLAG_INF.CST 50 50 char 0 31 31 char 0 0 0 0 Flinn_Engdahl_region FLINN_EN.LST 51 53 short 0 32 33 short 0 47 693 39315 ms_local_magn MS_LOCAL.LST 54 55 short 1 34 35 short 1 2 8 765 MS NO HISTOGRAM 56 57 constant 0 NOT IN BINARY z_h Z_H.CST 58 58 char 0 36 36 char 0 H Z 278 flag_cultural FLAG_CUL.CST 59 59 char 0 37 37 char 0 C F 1249 flag_other FLAG_OTH.CST 60 60 char 0 38 38 char 0 M S 4 magnitude_other NO HISTOGRAM 61 63 short 2 NOT IN BINARY magn_other_source NO HISTOGRAM 64 66 char 0 NOT IN BINARY international_data_exchange_event INTERNAT.CST 67 67 char 0 44 44 char 0 X X 4 flag_depth_control_PDE FLAG_DEP.CST 68 68 char 0 45 45 char 0 * N 5415 number_of_stations_or_quality NUMBER_O.CST 69 71 char 0 46 48 char 0 1 CCC 24818 time_authority TIME_AUT.CST 72 72 char 0 49 49 char 0 % Z 12900 ml_magn_local ML_MAGN_.LST 73 75 short 2 50 51 short 2 1 8 13547 ml_magn_local_scale ML_MAGN1.CST 76 77 char 0 52 53 char 0 CL NU 13568 ml_magn_local_authority NO HISTOGRAM 78 80 char 0 NOT IN BINARY latitude LATITUDE.LST NOT IN ASCII 4 7 long 3 14 30 39315 longitude LONGITUD.LST NOT IN ASCII 8 11 long 3 -150 -80 39315 depth_negate DEPTH_NE.LST NOT IN ASCII 12 13 short 0 -932 0 34795 magn_other MAGN_OTH.LST NOT IN ASCII 39 40 short 2 2 8 3961 magn_other_authority MAGN_OT1.CST NOT IN ASCII 41 43 char 0 BDA TUL 4032 ml_magn_local_source ML_MAGN2.CST NOT IN ASCII 54 56 char 0 ABE WHI 13568 year_decimal YEAR_DEC.LST NOT IN ASCII 71 78 double 10 1523.000 1995.656 39315 ==================================== Format File The format file is a listing of the variable names, types and positions within the binary and ASCII files. The file is composed of two parts - the first section is the format of the ASCII file, the second, the format of the binary file. The ASCII format file *.af must be renamed to *.afm to be used with the Freeform utility. Likewise, the binary format file *.bf must be renamed to *.bfm. The structure of this file is: Field 1: Variable name Field 2: First position of variable in line Field 3: Last position of variable in line Field 4: Type of variable Field 5: Precision of variable **Refer to Freeform user's manual for further information See format file mexico.fmt in this directory ==================================== ======================================================== Sample Data A representative sample of data records showing the first 10 lines and the last 10 lines of the ASCII data file(i.e. the .dat file). The first and last 10 records of mexico.dat follow ======================================================== SIG 1523 19200N 96400W 0 525 C 000SIG SIG 1538 19200N 99100W 0 523 C 000SIG SIG 15420317000000019200N 99100W 0 523 C 000SIG SIG 15681227000000020200N103500W 0 524 C 000SIG SIG 1603 17000N 96300W 0 060 C 000SIG SIG 160403 17000N 96300W 0 060 C 000SIG SIG 16080108000000017000N 96300W 0 060 C 000SIG SIG 16110825000000019500N 99100W 0 523 C 000SIG SIG 16110925000000019500N 99100W 0 523 C 000SIG SIG 16190213000000017000N 96300W 0 060 C 000SIG . . . . PDE 19950730230414217245N 99882W 45 059 ? 8% PDE 19950731214742917491N101157W 10 058 G 7% PDE 19950813212343914752N 91061W 2342 MB 070 D 27* PDE 19950814211422115971N 95767W 3343 MB 066 N 27* PDE 19950818083556615180N104987W 3341 MB 064 N 18* PDE 19950822105614216000N 92967W 33 061 N 6? PDE 19950823053944317017N 99735W 27 059 10% PDE 19950824013951828515N112956W 1044 MB 049 G 34 PDE 19950828104612026092N110284W 1257 MBFPS 04965MS 690GS G207 660MWGS PDE 19950828122304025966N110262W 1047 MB 049 G 87 ==================================== Variable File This file contains statistical information on each of the variables in the data set. The variable file mexico.var for this catalog follows ==================================== Input file : mexico.bin Input format file: mexico.fmt No requested precision, Approximate number of sorting bins = 100 source: 39315 values read minimum: BCI found at record 1070 maximum: USE found at record 548 Summary file: source.cst Histogram data precision: 0, Number of sorting bins: 17 latitude: 39315 values read minimum: 14.000 found at record 100 maximum: 30.000 found at record 203 Summary file: latitude.lst Histogram data precision: 0, Number of sorting bins: 56 longitude: 39315 values read minimum: -149.100 found at record 7315 maximum: -80.000 found at record 94 Summary file: longitud.lst Histogram data precision: 0, Number of sorting bins: 85 depth_negate: 39315 values read minimum: -930 found at record 301 maximum: 0 found at record 1 Summary file: depth_ne.lst Histogram data precision: 0, Number of sorting bins: 8 mb_magn: 39315 values read minimum: 0.00 found at record 1 maximum: 7.10 found at record 34867 Summary file: mb_magn.lst flag_isoseismal: 39315 values read minimum: found at record 1 maximum: PDE found at record 10468 Summary file: flag_iso.cst intensity: 39315 values read minimum: found at record 1 maximum: X found at record 263 Summary file: intensit.cst flags_ngdc: 39315 values read minimum: found at record 1 maximum: FT found at record 11242 Summary file: flags_ng.cst flag_diastrophic: 39315 values read minimum: found at record 1 maximum: F found at record 11242 Summary file: flag_dia.cst flag_tsunami: 39315 values read minimum: found at record 1 maximum: T found at record 23 Summary file: flag_tsu.cst flag_seiche: 39315 values read minimum: found at record 1 maximum: S found at record 29205 Summary file: flag_sei.cst flag_volcanism: 39315 values read minimum: found at record 1 maximum: found at record 1 Summary file: flag_vol.cst flag_non_tectonic: 39315 values read minimum: found at record 1 maximum: found at record 1 Summary file: flag_non.cst flag_infrasonic: 39315 values read minimum: found at record 1 maximum: found at record 1 Summary file: flag_inf.cst Histogram data precision: 0, Number of sorting bins: 45 Flinn_Engdahl_region: 39315 values read minimum: 47 found at record 707 maximum: 693 found at record 335 Summary file: Flinn_En.lst Histogram data precision: 0, Number of sorting bins: 8 ms_local_magn: 39315 values read minimum: 0.0 found at record 1 maximum: 8.1 found at record 29205 Summary file: ms_local.lst z_h: 39315 values read minimum: found at record 1 maximum: Z found at record 11032 Summary file: z_h.cst flag_cultural: 39315 values read minimum: found at record 41 maximum: F found at record 70 Summary file: flag_cul.cst flag_other: 39315 values read minimum: found at record 1 maximum: S found at record 33674 Summary file: flag_oth.cst Histogram data precision: 0, Number of sorting bins: 8 magn_other: 39315 values read minimum: 0.00 found at record 1 maximum: 8.40 found at record 79 Summary file: magn_oth.lst magn_other_authority: 39315 values read minimum: found at record 69 maximum: TUL found at record 4364 Summary file: magn_ot1.cst international_data_exchange_event: 39315 values read minimum: found at record 1 maximum: X found at record 11239 Summary file: internat.cst flag_depth_control_PDE: 39315 values read minimum: found at record 1 maximum: N found at record 4022 Summary file: flag_dep.cst number_of_stations_or_quality: 39315 values read minimum: found at record 1 maximum: CCC found at record 158 Summary file: number_o.cst time_authority: 39315 values read minimum: found at record 1 maximum: Z found at record 70 Summary file: time_aut.cst Histogram data precision: 0, Number of sorting bins: 9 ml_magn_local: 39315 values read minimum: 0.00 found at record 1 maximum: 8.40 found at record 727 Summary file: ml_magn_.lst ml_magn_local_scale: 39315 values read minimum: found at record 1 maximum: NU found at record 11192 Summary file: ml_magn1.cst ml_magn_local_source: 39315 values read minimum: found at record 1 maximum: WHI found at record 8644 Summary file: ml_magn2.cst Histogram data precision: 0, Number of sorting bins: 103 century_and_year: 39315 values read minimum: 1523 found at record 1 maximum: 1995 found at record 39189 Summary file: century_.lst Histogram data precision: 0, Number of sorting bins: 13 month: 39315 values read minimum: 0 found at record 1 maximum: 12 found at record 4 Summary file: month.lst Histogram data precision: 0, Number of sorting bins: 32 day: 39315 values read minimum: 0 found at record 1 maximum: 31 found at record 43 Summary file: day.lst Histogram data precision: 0, Number of sorting bins: 24 hour: 39315 values read minimum: 0 found at record 1 maximum: 23 found at record 79 Summary file: hour.lst Histogram data precision: 0, Number of sorting bins: 60 minute: 39315 values read minimum: 0 found at record 1 maximum: 59 found at record 164 Summary file: minute.lst Histogram data precision: 0, Number of sorting bins: 60 second: 39315 values read minimum: 0.0 found at record 1 maximum: 59.9 found at record 4262 Summary file: second.lst Histogram data precision: 0, Number of sorting bins: 84 depth: 39315 values read minimum: 0 found at record 1 maximum: 930 found at record 301 Summary file: depth.lst Histogram data precision: 0, Number of sorting bins: 103 year_decimal: 39315 values read minimum: 1523.0001160895 found at record 1 maximum: 1995.6562082699 found at record 39315 Summary file: year_dec.lst ==================================== The bibliographic file mexico.bib for this catalog follows ==================================== This is the NGDC Bibliography for the Central America Region ---. "Catalog of Nicaraguan Earthquakes." Bulletin of the Seismological Society of America Vol. 64.No. 4 (1974): 1135-58. ---. "Catalog of Nicaraguan Earthquakes." Bulletin of the Seismological Society of America Vol. 64.No. 4 (1974): 1135-58. ---. "New Seismic Chart of Mexico." Anales Del Instituto De Geofisica, Universidad Nacional Autonoma De Mexico Volume V (1959): pages 45-162. ---. "Reporte De Los Temblores Ocurridos En Nicaragua Los Meses De Marzo a Junio De 1975." Soft Cover Booklet, Journal. Boletin Volume I.No. I (1975). ---. "The Mexico Earthquake of July 28, 1957." Publication of the California Chapters, Construction Specification Institute, Inc. (1957): 1-3. Claxton, R. H. "Investigating Natural Hazards in Latin American History." West Georgia College Studies in the Social Sciences Volunme XXV (1986). Dewey, J. W and Algermissen S. T. "Seismicity of the Middle America Arc-Trench System Near Managua, Nicaragua." Bulletin of the Seismological Society of America Vol. 64.No. 4 (1974): 1033-47. Figueroa A., Jesųs. "Historia Sismica Y Estadistica De Temblores De La Costa Occidental De Mexico." Boletin Bibliografico De Geofisica Y Oceanografia Americanas Volume III, Parta Geofisica, 1960-1962 (1963): Pages 108-33. Groves, Gordon W. and Lezama Pedro Figueroa A. Jesųs Mejėa de Valle Marta Canōn A. Carlos Guerrero Jesųs Martėnez. Anales Del Instituto De Geofisica. Mexico: Instituto De Geofisica, Torre De Ciencias Ciudad Universitaria Mexico 20, D. F., 1959. Hollis, E. P. "The Earthquake Problem in the Western Hemisphere." Bulletin of the Pan American Union .February (1948): Pages 86-100. Leeds, D. J. Catalog of Nicaraguan Earthquakes 1520 - 1973. Revised Copy ed. Los Angeles: Dames and Moore, 1974. Volume 64. Merino y Coronado, J. "Notes Concerning the Seismicity of Central America." Journals of the Institute of Geophysics Vols. 18 - 19 (1975): 159-80. Merion Y Coronado, J. "Earlier Notes of Seismic Observations in the Republic of Mexico." Journal of the Institute of Geophysics of the National Autonomous Universisty of Mexico Vol. 9 (1963): 11-32. Ministry of Public Works. "Two Articles: 1) Summary of Seismic Activity Registered in El Salvador During the Months of May Through August, 1961 and 2) Preliminary Seismic Map of the Republic of El Salvador." Seismological Bulletin of National Geological Service of El Salvador Vol. 7.May - August (1962): 26-27. Munoz, A. V., Author. Seismicity of Panama During the Interval 1904-83. Soft Cover Booklet, Report. Uppsala, Sweden: Seismological Department. Uppsala University, 1987. Report No. 1-87. Quesada, A. A. "Report of Earthquakes Occuring in Nicaragua in the Months of March Through June of 1975." Bulletin of the Institute of Seismic Investigations Vol. 1.No. 1 (1975): 1-23. Schultz, R. "Estudio Sobre La Sismicidad En La Region Centro-Americana." Boletin Bibliografico De Geofisica Y Oceanografia Americanas Volume III, Parte Geofėsica, 1960-1962 (1963): Pages 136-44. Singh, S. K. Rodriguez M and Espindola J. M. "A Catalog of Shallow Earthquakes of Mexico From 1900 to 1981." Bulletin of the Seismological Society of America Vol. 74.No. 1 (1984): 1-279. ======================================================== Additional Documentation Any other files contributed to or generated by NGDC as documentation for the data base follows. ======================================================== ======================================================== ======================================================== Following is an abbreviated summary of the format for the ASCII version of this file - *.dat. For a more extensive version of this format, please see the file: formtap.txt in /data/supplmnt directory Line Position Field Comments 1-3 Data source Source from which all or most of the data were obtained. 4 B.C. data indicator Minus sign indicates pre- Christian era. 4-12 Date (Universal Positions 4-8 year, 9-10 month, and 11-12 day Time--UT). 13-19 Origin Time Computed, or observed if (Universal Time--UT) controlled explosion with shot timed. Positions 13-14 hour, 15-16 minute, and 17-19 second. Implied decimal between positions 18 and 19. 20-24 Geographic latitude Usually given to three (decimal degrees) decimal places, although this degree of accuracy is not necessarily applicable. Implied decimal between positions 21 and 22. 25 N/S North or South latitude. 26-31 Geographic longitude Usually given to three (decimal degrees) decimal places. Implied decimal between positions 28 and 29. 32 E/W East or West longitude. 33-35 Focal depth (km) See also position 68. 36-38 Body-wave (Mb) Implied decimal between average value positions 36 and 37. Value as determined by *PDE program. 39-40 MB If magnitude in 36-38 is given. 41-43 Isoseismal map, Three-letter abbreviation fault plane indicating the publication solution, or both of an isoseismal (intensity) map in the following publications: USE, United States Earthquakes; *PDE, Preliminary Deter- mination of Epicenters; WEL, New Zealand Seismologoy Report, Wellington, N.Z.; BSS, Bulleting of the Seismological Society of America; ZUR, Zurich, Switzerland; NTR, Nature Magazine. FPS indicates a fault- plane solution was computed. BOT means that both a fault plane solution and an isoseismal map were produced by the U.S. Geological Survey. 44 Maximum intensity Modified Mercalli Scale or converted to MM Scale: 1-9 = I-IX X = X E = XI T = XII See Appendix 5. 45-50 Associated Phenomena 45 Diastrophism code F = Surface faulting. U = Uplift/subsidence. D = Faulting and uplift/ subsidence. 46 Tsunami code T = Tsunami generated. Q = Possible Tsunami. 47 Seiche code S = Seiche. Q = Possible Seiche. 48 Volcanism Code V = Earthquake associated with volcanism. 49 Nontectonic code R = Rockburst. C = Coal bump or rock- burst in coal mine. M = Meteoritic source. E = Explosion -- accidental, con- trolled or suspected. I = Collapse. L = Lights or other such visual phenomena seen. 50 Waves generated code T = T-wave. A = Acoustic Wave. G = Gravity wave. B = Both A and G. 51-53 Flinn-Engdahl geo- As described by Flinn graphic region no. and others (1974). See appendix 6. 54-55 Surface wave (Ms) Implied decimal between avergae value positions 54 and 55. Value determined by PDE program. (IASPEI formula used). 56-57 MS If magnitude in 54-55 is given. 58 Component Z or H Z = Ms computed from component long- period vertical. H = Ms computed from long-period horizontal component. 59 Cultural Effects C, D, F or H in position 59 indicates reported casualties, damage, felt information or earthquake heard, respectively. The notations listed here provide a brief summary of the earthquake effects on populations and buildings. Casualty, damage, or felt reports associated with a particular earthquake do not imply that the effects were noted at the epi- central position. Especially with offshore earthquakes, the maximum intensity may be reported at some distance from the source of the shock. An "F" in this position (felt but no damage reported) having no accompanying intensity (position 44) is likely associated with an intensity of I - III on the Modified Mercalli Scale; however, tha actual intensity may be higher. 60 Unusual Events L = Liquefaction. G = Geyser/fumerol. S = Landsliding, avalanche. B = Sand Blows. C = Ground cracking, not associated with faulting. V = Visual phenomena or lights. O = Olfactory phenomena. M = More than one of the above. 61-63 Other Magnitude Value obtained from several sources; unspec- ified magnitude type but generally Ms (implied decimal between positions 61 and 62). Fractions have been converted to decimal numbers, or encoded as follows: 6 - 6 1/4 = 6.13 6 1/4 = 6.25 6 1/4 - 6 1/2 = 6.38 6 1/2 = 6.50 6 1/2 - 6 3/4 = 6.63 6 3/4 = 6.75 6 3/4 - 7 = 6.88 For any other range, median values are listed. 64-66 Authority for See source codes in magnitude in appendix 4. positions 61-63 67 Special event X = International Date designator Exchange (IDE) earthquake. 68 Depth control A = Assigned. Designator D = Restrained depth based on 2 or more reported pP's identified as such. G = Depth restrained by Geophysicist. N = Held at 33 km (Normal Depth) where data not sensitive to depth for a shallow-focus. S = Depth control aided by use of S-phase data. * = Less well-constrained free-depth solution; 90% confidence it lies within 8.5 and 16 km (used since January 1985). ? = Poorly constrained free depth solution (used since January 1985). 69-71 Number of stations/ Number of P and/or P' Quality Indicators arrivals used in hypo- center solution. Quality Indicators are as listed below: Source Style and Indicators _____________________________________________________________________________ Source Style and Indicators Single-letter designator in position 69 72 Authority for time Blank = Authority same coordinates/other as source (positions quality indicators 1-3). 73-75 Local Magnitude Implied decimal between positions 73 and 74. 76-77 Magnitude scale used If magnitude in 73-75 is given. Generally ML; USGS will use MB. ML = Local magnitude MB = Body-wave magnitude CL = Coda-length magnitude MS = Surface-wave magnitude DR = Duration Magnitude NU = Nuttli Magnitude MW = Moment magnitude (Abe, 1983, 1984) MR = Rautian magnitude (Kondorskaya and Shebalin, 1982) LH = Magnitude Mlh (Kondorskaya and Shebalin, 1982) LG = Lg body-wave magnitude (Nuttli, 1973) SL = Magnitude from Stover and others, 1984 SH = Magnitude from Stover and others, 1984 SA = Magnitude from Stover and others, 1984 SU = Magnitude of unknown origin from Stover and others, 1984 K = Russian Energy class magnitude MC = Reported magnitude of unknown origin MG = Reported magnitude of unknown origin 78-80 Authority for value in 73-75. ========================================================================= END OF DOCUMENTATION FILE =========================================================================