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 hdc.tab for this catalog follows ==================================== DATA SET TITLE: hdc PRINCIPAL INVESTIGATOR: CONTRIBUTING ORGANIZATION: HDC C LATITUDE: 10.00067 N LONGITUDE: 84.1084 W HDC C Elevation: 1150.0 LOCATION and NAME: Heredia HDC2 LATITUDE: 10.02083 N LONGITUDE: 84.12467 W HDC2 Elevation: 1220.0 LOCATION and NAME: Heredia 2 DATA FILE: hdc.bin #\data\cam\hdc\hdc.bin NUMBER OF RECORDS: 140 ASCII FILE SIZE: 11480 BINARY FILE SIZE: 10920 SUMMARY: HDC Heredia, Cost Rica Regional data from Heredia, Costa Rica 1988 - 1990 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 HDC HDC 140 century_and_year CENTURY_.LST 4 8 short 0 57 58 short 0 1988 1990 140 month MONTH.LST 9 10 short 0 59 60 short 0 1 12 140 day DAY.LST 11 12 short 0 61 62 short 0 1 31 140 hour HOUR.LST 13 14 short 0 63 64 short 0 1 23 131 minute MINUTE.LST 15 16 short 0 65 66 short 0 1 59 140 second SECOND.LST 17 19 short 1 67 68 short 1 1 59 138 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 4 178 136 mb_magn MB_MAGN.LST 36 38 short 2 14 15 short 2 0 0 0 MB NO HISTOGRAM 39 40 constant 0 NOT IN BINARY flag_isoseismal FLAG_ISO.CST 41 43 char 0 16 18 char 0 0 0 0 intensity INTENSIT.CST 44 44 char 0 19 19 char 0 0 0 0 flags_ngdc FLAGS_NG.CST 45 50 char 0 20 25 char 0 0 0 0 flag_diastrophic FLAG_DIA.CST 45 45 char 0 26 26 char 0 0 0 0 flag_tsunami FLAG_TSU.CST 46 46 char 0 27 27 char 0 0 0 0 flag_seiche FLAG_SEI.CST 47 47 char 0 28 28 char 0 0 0 0 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 71 83 140 ms_local_magn MS_LOCAL.LST 54 55 short 1 34 35 short 1 0 0 0 MS NO HISTOGRAM 56 57 constant 0 NOT IN BINARY z_h Z_H.CST 58 58 char 0 36 36 char 0 0 0 0 flag_cultural FLAG_CUL.CST 59 59 char 0 37 37 char 0 F F 35 flag_other FLAG_OTH.CST 60 60 char 0 38 38 char 0 0 0 0 magn_other MAGN_OTH.LST 61 63 short 2 39 40 short 2 2 4 18 magn_other_authority MAGN_OT1.CST 64 66 char 0 41 43 char 0 HDC HDC 18 international_data_exchange_event INTERNAT.CST 67 67 char 0 44 44 char 0 0 0 0 flag_depth_control_PDE FLAG_DEP.CST 68 68 char 0 45 45 char 0 0 0 0 number_of_stations_or_quality NUMBER_O.CST 69 71 char 0 46 48 char 0 7 11 2 time_authority TIME_AUT.CST 72 72 char 0 49 49 char 0 0 0 0 ml_magn_local ML_MAGN_.LST 73 75 short 2 50 51 short 2 2 6 122 ml_magn_local_scale ML_MAGN1.CST 76 77 char 0 52 53 char 0 DR ML 122 ml_magn_local_source ML_MAGN2.CST 78 80 char 0 54 56 char 0 HDC HDC 122 latitude LATITUDE.LST NOT IN ASCII 4 7 long 3 4 13 140 longitude LONGITUD.LST NOT IN ASCII 8 11 long 3 -91 -82 140 depth_negate DEPTH_NE.LST NOT IN ASCII 12 13 short 0 -178 0 136 year_decimal YEAR_DEC.LST NOT IN ASCII 71 78 double 10 1988.006 1990.146 140 ==================================== 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 hdc.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 hdc.dat follow ======================================================== HDC 198801031006324 9630N 84180W 42 078 F 310DRHDC HDC 198801112353421 8940N 84060W 21 077 F 360DRHDC HDC 198801131134391 9480N 83620W 13 078 F 340DRHDC HDC 198801191314001 9670N 84140W 42 078 F 360DRHDC HDC 198801252013356 8930N 84150W 7 077 F 430DRHDC HDC 198801312331450 9770N 83630W 9 078 F 440DRHDC HDC 198801312340258 9770N 83630W 17 078 F 370DRHDC HDC 198803020713128 9460N 84920W 31 078 470MLHDC HDC 198803110347583 8720N 83540W 22 078 400DRHDC HDC 198803111347276 8900N 83160W 28 078 450MLHDC . . . . HDC 19891130012702410710N 86300W 21 077 420DRHDC HDC 19900110184252311260N 85800W163 075 440DRHDC HDC 19900112032456012080N 87640W 35 074 550DRHDC HDC 19900120111037311180N 85860W137 075 410DRHDC HDC 19900131075010210820N 85240W156 078 450DRHDC HDC 19900204064514611220N 86010W 84 074 420DRHDC HDC 199002160749239 8490N 83180W 36 078 470DRHDC HDC 199002170556293 9250N 84230W 24 078 400DRHDC HDC 19900222185933411680N 87830W 35 074 560DRHDC HDC 19900223084044011270N 85990W 99 075 490DRHDC ==================================== Variable File This file contains statistical information on each of the variables in the data set. The variable file hdc.var for this catalog follows ==================================== Input file : hdc.bin Input format file: hdc.fmt No requested precision, Approximate number of sorting bins = 100 source: 140 values read minimum: HDC found at record 1 maximum: HDC found at record 1 Summary file: source.cst Histogram data precision: 0, Number of sorting bins: 10 latitude: 140 values read minimum: 4.740 found at record 36 maximum: 13.350 found at record 86 Summary file: latitude.lst Histogram data precision: 0, Number of sorting bins: 8 longitude: 140 values read minimum: -90.320 found at record 86 maximum: -81.100 found at record 108 Summary file: longitud.lst Histogram data precision: 0, Number of sorting bins: 75 depth_negate: 140 values read minimum: -178 found at record 102 maximum: 0 found at record 34 Summary file: depth_ne.lst Histogram data precision: 0, Number of sorting bins: 1 mb_magn: 140 values read minimum: 0.00 found at record 1 maximum: 0.00 found at record 1 Summary file: mb_magn.lst flag_isoseismal: 140 values read minimum: found at record 1 maximum: found at record 1 Summary file: flag_iso.cst intensity: 140 values read minimum: found at record 1 maximum: found at record 1 Summary file: intensit.cst flags_ngdc: 140 values read minimum: found at record 1 maximum: found at record 1 Summary file: flags_ng.cst flag_diastrophic: 140 values read minimum: found at record 1 maximum: found at record 1 Summary file: flag_dia.cst flag_tsunami: 140 values read minimum: found at record 1 maximum: found at record 1 Summary file: flag_tsu.cst flag_seiche: 140 values read minimum: found at record 1 maximum: found at record 1 Summary file: flag_sei.cst flag_volcanism: 140 values read minimum: found at record 1 maximum: found at record 1 Summary file: flag_vol.cst flag_non_tectonic: 140 values read minimum: found at record 1 maximum: found at record 1 Summary file: flag_non.cst flag_infrasonic: 140 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: 8 Flinn_Engdahl_region: 140 values read minimum: 71 found at record 86 maximum: 83 found at record 15 Summary file: Flinn_En.lst Histogram data precision: 0, Number of sorting bins: 1 ms_local_magn: 140 values read minimum: 0.0 found at record 1 maximum: 0.0 found at record 1 Summary file: ms_local.lst z_h: 140 values read minimum: found at record 1 maximum: found at record 1 Summary file: z_h.cst flag_cultural: 140 values read minimum: found at record 8 maximum: F found at record 1 Summary file: flag_cul.cst flag_other: 140 values read minimum: found at record 1 maximum: found at record 1 Summary file: flag_oth.cst Histogram data precision: 0, Number of sorting bins: 4 magn_other: 140 values read minimum: 0.00 found at record 1 maximum: 4.40 found at record 41 Summary file: magn_oth.lst magn_other_authority: 140 values read minimum: found at record 1 maximum: HDC found at record 25 Summary file: magn_ot1.cst international_data_exchange_event: 140 values read minimum: found at record 1 maximum: found at record 1 Summary file: internat.cst flag_depth_control_PDE: 140 values read minimum: found at record 1 maximum: found at record 1 Summary file: flag_dep.cst number_of_stations_or_quality: 140 values read minimum: found at record 1 maximum: 11 found at record 14 Summary file: number_o.cst time_authority: 140 values read minimum: found at record 1 maximum: found at record 1 Summary file: time_aut.cst Histogram data precision: 0, Number of sorting bins: 6 ml_magn_local: 140 values read minimum: 0.00 found at record 25 maximum: 6.30 found at record 86 Summary file: ml_magn_.lst ml_magn_local_scale: 140 values read minimum: found at record 25 maximum: ML found at record 8 Summary file: ml_magn1.cst ml_magn_local_source: 140 values read minimum: found at record 25 maximum: HDC found at record 1 Summary file: ml_magn2.cst Histogram data precision: 0, Number of sorting bins: 3 century_and_year: 140 values read minimum: 1988 found at record 1 maximum: 1990 found at record 132 Summary file: century_.lst Histogram data precision: 0, Number of sorting bins: 10 month: 140 values read minimum: 1 found at record 1 maximum: 12 found at record 14 Summary file: month.lst Histogram data precision: 0, Number of sorting bins: 30 day: 140 values read minimum: 1 found at record 69 maximum: 31 found at record 6 Summary file: day.lst Histogram data precision: 0, Number of sorting bins: 24 hour: 140 values read minimum: 0 found at record 18 maximum: 23 found at record 2 Summary file: hour.lst Histogram data precision: 0, Number of sorting bins: 54 minute: 140 values read minimum: 1 found at record 13 maximum: 59 found at record 112 Summary file: minute.lst Histogram data precision: 0, Number of sorting bins: 53 second: 140 values read minimum: 0.1 found at record 4 maximum: 59.6 found at record 13 Summary file: second.lst Histogram data precision: 0, Number of sorting bins: 75 depth: 140 values read minimum: 0 found at record 34 maximum: 178 found at record 102 Summary file: depth.lst Histogram data precision: 0, Number of sorting bins: 3 year_decimal: 140 values read minimum: 1988.0066153233 found at record 1 maximum: 1990.1461962202 found at record 140 Summary file: year_dec.lst ==================================== The bibliographic file hdc.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 =========================================================================