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 carib.tab for this catalog follows ==================================== DATA SET TITLE: carib PRINCIPAL INVESTIGATOR: CONTRIBUTING ORGANIZATION: NGDC DATA FILE: carib.bin #\data\carib\carib.bin NUMBER OF RECORDS: 12595 ASCII FILE SIZE: 1032790 BINARY FILE SIZE: 982410 SUMMARY: Regional Catalog for the Caribbean Sea (NGDC) The Caribbean catalog included on this CD is a compilation of all events listed in the NGDC earthquake data base. Several catalogs of data adjoining the Caribbean are also located on Volume 2 - Global catalogs. This is the composite catalog of earthquakes for the Caribbean region from the NGDC data base. The time covered is: 1502 - 1995 The region covered is: 9 N - 26 N 88 W - 55 W This catalog has data obtained from many sources. Multiple listings for the same event are common. 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 USN 12595 century_and_year CENTURY_.LST 4 8 short 0 57 58 short 0 1502 1994 12595 month MONTH.LST 9 10 short 0 59 60 short 0 1 12 12557 day DAY.LST 11 12 short 0 61 62 short 0 1 31 12547 hour HOUR.LST 13 14 short 0 63 64 short 0 1 23 11972 minute MINUTE.LST 15 16 short 0 65 66 short 0 1 59 12246 second SECOND.LST 17 19 short 1 67 68 short 1 1 59 12060 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 2 500 11017 mb_magn MB_MAGN.LST 36 38 short 2 14 15 short 2 3 6 3215 MB NO HISTOGRAM 39 40 constant 0 NOT IN BINARY flag_isoseismal FLAG_ISO.CST 41 43 char 0 16 18 char 0 FPS FPS 28 intensity INTENSIT.CST 44 44 char 0 19 19 char 0 1 X 561 flags_ngdc FLAGS_NG.CST 45 50 char 0 20 25 char 0 T UT 33 flag_diastrophic FLAG_DIA.CST 45 45 char 0 26 26 char 0 U U 1 flag_tsunami FLAG_TSU.CST 46 46 char 0 27 27 char 0 Q T 28 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 T T 5 Flinn_Engdahl_region FLINN_EN.LST 51 53 short 0 32 33 short 0 72 526 12595 ms_local_magn MS_LOCAL.LST 54 55 short 1 34 35 short 1 2 7 598 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 172 flag_cultural FLAG_CUL.CST 59 59 char 0 37 37 char 0 C F 1330 flag_other FLAG_OTH.CST 60 60 char 0 38 38 char 0 M S 12 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 1 flag_depth_control_PDE FLAG_DEP.CST 68 68 char 0 45 45 char 0 * N 6724 number_of_stations_or_quality NUMBER_O.CST 69 71 char 0 46 48 char 0 1 IX* 10906 time_authority TIME_AUT.CST 72 72 char 0 49 49 char 0 % Z 7635 ml_magn_local ML_MAGN_.LST 73 75 short 2 50 51 short 2 1 8 5405 ml_magn_local_scale ML_MAGN1.CST 76 77 char 0 52 53 char 0 DR MW 5406 ml_magn_local_authority NO HISTOGRAM 78 80 char 0 NOT IN BINARY latitude LATITUDE.LST NOT IN ASCII 4 7 long 3 9 26 12595 longitude LONGITUD.LST NOT IN ASCII 8 11 long 3 -88 -55 12595 depth_negate DEPTH_NE.LST NOT IN ASCII 12 13 short 0 -500 0 11045 magn_other MAGN_OTH.LST NOT IN ASCII 39 40 short 2 2 9 1285 magn_other_authority MAGN_OT1.CST NOT IN ASCII 41 43 char 0 APY USE 1407 ml_magn_local_source ML_MAGN2.CST NOT IN ASCII 54 56 char 0 ABE WHI 5406 year_decimal YEAR_DEC.LST NOT IN ASCII 71 78 double 10 1502.000 1995.664 12595 ==================================== 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 carib.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 carib.dat follow ======================================================== SIG 1502 18300N 69500W 0 088 C 000SIG SIG 15300901000000010700N 62500W 0 097 C 000SIG CER 15300901143000010700N 64100W 0 X 097 SIG 15300901143000010700N 64100W 0 X 097 C 000SIG SIG 15300911150000010300N 64100W 0 T 097 C 000SIG SIG 1543 10600N 64100W 0 097 C 000SIG SIG 1543 10700N 64100W 0 097 C 000SIG SIG 15640420000000019100N 70300W 0 088 C 000SIG CER 1629 10470N 64170W 0 7 097 SIG 1641 11000N 67000W 0 094 C 000SIG . . . . PDE 19950827102611810918N 61665W 33 098 N 5%370MDTRN PDE 19950827162350110460N 61695W 33 098 N 4?220MDTRN PDE 19950829050641910756N 62382W 32 097 * 6? PDE 19950829083549018043N 66968W 10 090 G 4?180MDMPR PDE 19950829174614717176N 67429W 10 089 G 6?270MDMPR PDE 19950829214937218711N 67096W 70 089 G 6?280MDMPR PDE 19950830051349310375N 61506W 42 098 ? 8* PDE 19950830053609211149N 63305W 10 094 G 6? PDE 19950831001508210351N 61251W 33 098 N 4? PDE 19950831120016111275N 62520W150 095 G 4? ==================================== Variable File This file contains statistical information on each of the variables in the data set. The variable file carib.var for this catalog follows ==================================== Input file : carib.bin Input format file: carib.fmt No requested precision, Approximate number of sorting bins = 100 source: 12595 values read minimum: BCI found at record 1032 maximum: USN found at record 764 Summary file: source.cst Histogram data precision: 0, Number of sorting bins: 18 latitude: 12595 values read minimum: 9.000 found at record 166 maximum: 26.500 found at record 322 Summary file: latitude.lst Histogram data precision: 0, Number of sorting bins: 34 longitude: 12595 values read minimum: -88.000 found at record 2734 maximum: -54.786 found at record 5293 Summary file: longitud.lst Histogram data precision: 0, Number of sorting bins: 121 depth_negate: 12595 values read minimum: -500 found at record 785 maximum: 0 found at record 1 Summary file: depth_ne.lst Histogram data precision: 0, Number of sorting bins: 5 mb_magn: 12595 values read minimum: 0.00 found at record 1 maximum: 6.60 found at record 3875 Summary file: mb_magn.lst flag_isoseismal: 12595 values read minimum: found at record 1 maximum: FPS found at record 6309 Summary file: flag_iso.cst intensity: 12595 values read minimum: found at record 1 maximum: X found at record 3 Summary file: intensit.cst flags_ngdc: 12595 values read minimum: found at record 1 maximum: UT found at record 9688 Summary file: flags_ng.cst flag_diastrophic: 12595 values read minimum: found at record 1 maximum: U found at record 9688 Summary file: flag_dia.cst flag_tsunami: 12595 values read minimum: found at record 1 maximum: T found at record 5 Summary file: flag_tsu.cst flag_seiche: 12595 values read minimum: found at record 1 maximum: found at record 1 Summary file: flag_sei.cst flag_volcanism: 12595 values read minimum: found at record 1 maximum: found at record 1 Summary file: flag_vol.cst flag_non_tectonic: 12595 values read minimum: found at record 1 maximum: found at record 1 Summary file: flag_non.cst flag_infrasonic: 12595 values read minimum: found at record 1 maximum: T found at record 3090 Summary file: flag_inf.cst Histogram data precision: 0, Number of sorting bins: 31 Flinn_Engdahl_region: 12595 values read minimum: 72 found at record 289 maximum: 526 found at record 5759 Summary file: Flinn_En.lst Histogram data precision: 0, Number of sorting bins: 7 ms_local_magn: 12595 values read minimum: 0.0 found at record 1 maximum: 7.6 found at record 9688 Summary file: ms_local.lst z_h: 12595 values read minimum: found at record 1 maximum: Z found at record 3945 Summary file: z_h.cst flag_cultural: 12595 values read minimum: found at record 3 maximum: F found at record 120 Summary file: flag_cul.cst flag_other: 12595 values read minimum: found at record 1 maximum: S found at record 6366 Summary file: flag_oth.cst Histogram data precision: 0, Number of sorting bins: 9 magn_other: 12595 values read minimum: 0.00 found at record 1 maximum: 9.60 found at record 85 Summary file: magn_oth.lst magn_other_authority: 12595 values read minimum: found at record 3 maximum: USE found at record 3287 Summary file: magn_ot1.cst international_data_exchange_event: 12595 values read minimum: found at record 1 maximum: X found at record 3875 Summary file: internat.cst flag_depth_control_PDE: 12595 values read minimum: found at record 1 maximum: N found at record 2084 Summary file: flag_dep.cst number_of_stations_or_quality: 12595 values read minimum: found at record 1 maximum: IX* found at record 745 Summary file: number_o.cst time_authority: 12595 values read minimum: found at record 1 maximum: Z found at record 120 Summary file: time_aut.cst Histogram data precision: 0, Number of sorting bins: 9 ml_magn_local: 12595 values read minimum: 0.00 found at record 1 maximum: 8.10 found at record 887 Summary file: ml_magn_.lst ml_magn_local_scale: 12595 values read minimum: found at record 1 maximum: MW found at record 876 Summary file: ml_magn1.cst ml_magn_local_source: 12595 values read minimum: found at record 1 maximum: WHI found at record 3967 Summary file: ml_magn2.cst Histogram data precision: 0, Number of sorting bins: 117 century_and_year: 12595 values read minimum: 1502 found at record 1 maximum: 1995 found at record 12252 Summary file: century_.lst Histogram data precision: 0, Number of sorting bins: 13 month: 12595 values read minimum: 0 found at record 1 maximum: 12 found at record 15 Summary file: month.lst Histogram data precision: 0, Number of sorting bins: 32 day: 12595 values read minimum: 0 found at record 1 maximum: 31 found at record 704 Summary file: day.lst Histogram data precision: 0, Number of sorting bins: 24 hour: 12595 values read minimum: 0 found at record 1 maximum: 23 found at record 70 Summary file: hour.lst Histogram data precision: 0, Number of sorting bins: 60 minute: 12595 values read minimum: 0 found at record 1 maximum: 59 found at record 211 Summary file: minute.lst Histogram data precision: 0, Number of sorting bins: 60 second: 12595 values read minimum: 0.0 found at record 1 maximum: 59.9 found at record 2124 Summary file: second.lst Histogram data precision: 0, Number of sorting bins: 121 depth: 12595 values read minimum: 0 found at record 1 maximum: 500 found at record 785 Summary file: depth.lst Histogram data precision: 0, Number of sorting bins: 117 year_decimal: 12595 values read minimum: 1502.0001160895 found at record 1 maximum: 1995.6643840722 found at record 12595 Summary file: year_dec.lst ==================================== The bibliographic file carib.bib for this catalog follows ==================================== This is the NGDC Bibliography for the Caribbean "Destructive and Near Destructive Earthquakes of Puerto Rico and Nearby Regions." House of Representatives Document No. 269. Sixty-Sixth Congress, First Session. (1946): 1-4. "Earthquakes in the Various States." Publication of the U.S. Printing Office GPO Jacket No 777-941 (1963): 106-18. "Puerto Rico Earthquakes, 1919 - 1937." Data Complied From Monthly Weather Review (1937): 1-2. "Research of Seismicity in Seismic Zones of Less Activity: Central Cuba." Publication of the Soviet Geophysical Committee and the Academy of Sciences of the USSR (1983): 1-134. ---. "The Puerto Rico Earthquakes of October-November, 1918." The Bulletin of the Seismological Society of America Vol. 9.No. 4 (1919): 95-127. ---. "The Seismicity of the Caribbean Region." Journal of Geophysical Research Vol. 70.No. 20 (1965): 5065-74. ---. A Catalogue of Earthquakes in the United States Prior to 1925 (Based on Unpublished Data Compiled by Harry Fielding Reid and Published Sources Prior to 1930). Honolulu, Hawaii: Hawaii Institute of Geophysics, University of Hawaii, June 1968. HIG-68-9 Data Report No. 10. Coffman, J. L. and von Hake C. A. "Earthquake History of The United States." Publication of the Environmental Data Service of NOAA .Publ. 41-1 (1973): 1-208. Coffman, J. L. and von Hake C. A. Stover C. W., Editors. Earthquake History of the United States. Hard Back (3) and Soft Cover Book (two copies). Publication 41-1 Revised Edition (Through 1970) Reprinted 1982 with Supplement (1971-1980) ed. U.S. Government Printing Office, Washington, D.C. and Boulder, CO: U.S. Department of Commerce, and U.S. Department of the Interior, 1973. 41-1. Coffman, J. L., Editor. Earthquake History of the United States. Soft Cover Booklet (one copy). Editors. J. L. Coffman. 1979 ed. Boulder, CO: U.S. Department of Commerce, National Oceanic and Atmospheric Administration and U.S. Department of the Interior, Geological Survey., 1979. Publication 41-1. Couch, R. Victor L. and Keeling K. Costal and Offshore Earthquakes of the Pacific Northwest. Corvallis, Oregon: School of Oceanography at Oregon State University, 1974. Hall, M. Earthquakes in Jamaica From 1688 to 1919. Kingston, Jamaica: Government Printing Office, 1922. Hall, M. S., Government MeteorologistSoft Cover Booklet. Barrister-At-Law, Government Meteorologist. M. Hall. Kingston, Jamaica: Government Printing Office, 1922. Hall, M. S., Barrister-At-Law. Earthquakes in Jamaica. Soft Cover. Compiler. M. Hall. Third Report, No. 337 ed. Kingston, Jamaica: Government Printing Office, 1907. Hays, W. W. Algermissen S. T. Espinosa A. F. Perkins D. M. Rinehart W. A. Guidelines for Developing Design Earthquake Response Spectra. Golden, CO: U.S. Geological Survey, 1974. Heck, N. H. Eppley R. A., Editors. Earthquake History of the United States. Soft Cover Booklet. Editors. N. H. Eppley R. A. Heck. Revised (1938, 1956) Editions ed. Washington, D.C.: U.S. Government Printing Office, 1938. No. 41-1. Heck, N. H. and Wood H. O., Editor. Earthquake History of the United States. Soft Cover Booklet. N. H. Heck. Original Edition (1938)(2 Copies), Revised (1947) Edition, Revised 1951 Edition. ed. Washington, D.C.: United States Government Printing Office, 1938. Heck, N. H., Division Chiefforty typewritten pages. Linehan, D. Compilation of Earthquakes in Northeastern United States and Eastern Canada 1534 - 1957. Weston Geophysical Research Inc. Map Showing Recomputed Hypocenters of Earthquakes in the Eastern and Central United States and Adjacent Canada, 1925-1980. Seismic. Reston, Virginia: U.S. Department of Interior, USGS, 1984. McClain, W. C. and Myers O. H.45 pages of 8 1/2" X 11 bound copy. Springfield, Virginia: U. S. Department of Commerce, 1970. ORNL-4582. Nottis, G. N. Editor New York State Geological Survey. Epicenters of Northeastern United States and Southeastern Canada, Onshore and Offshore; Time Period 1534-1980. Series No. 38, Map and Chart ed. Albany, N.Y.: The University of the State of New York, The State Education Department, Feb. 1983. Nuttli, O. W., AuthorSoft Cover Booklet. O. W. Nuttli. First Edition ed.Volume NO. 1, Monograph Series, Central United States Earthquake Consortium. Marion, Illinois: Funding provided by the Federal Emergency Management Agency, 1987. Reid, H. F. and Taber S. "The Porto Rico Earthquake of 1918." House of Representatives Publication (66th Congress, 1st Session) Document No. 269 (1919): 3-74. Results of Researches on the International Geophysical Projects. Research of Seismicity in Seismic Zones of Less Activity (Central Cuba). Moscow, Russia: Nauka, 1983. Rutten, L. M. R. and Van Raadshooven B. "On Earthquake Epicentres and Earthquake Shocks Between 1913 and 1938 in the Region Between 0° and 30° N and 56° and 120° W." Nederl. Akad. Wet., Verh. Tweede Sectie, Deel XXXIX.No. 4 (1940): Pages 1-44. Ryall, A. Slemmons D. B. & Gedney L. D. "Seismicity, Tectonism, and Surface Faulting in the Western United States During Historic Time." Bulletin of the Seismological Society of America Vol. 56.No. 5 (1966): 1105-35. Seismicity Map of the Conterminous United States and Adjacent Areas, 1965-1974 and 1975 - 1984. Seismic. Reston, Virginia: U.S. Department of Interior, USGS, 1977. Sykes, L. R. and Ewing M. "The Seismicity of the Caribbean Region." Journal of Geophysical Research Vol. 70.No. 20 (1965): 5065-74. Wood, H. O. Allen M. W. and Heck N. H., Chief, Division of Terrestrial Magnetism and SeismologyHard Cover Book. United States Government Printing Office: U.S. Department of Commerce, Coast and Geodetic Survey, 1934. Special Publication No. 191. Wood, H. O. Heck N. H. and Eppley R. A., Editors. Earthquake History of the United States. Soft Cover Booklet. Editors. H. O. Heck N. H. and Eppley R. A. Wood. Revised (1960) Edition ed. U.S. Government Printing Office, Washington, D.C.: U.S. Department of Commerce, Coast and Geodetic Survey, 1961. No. 41-1. Wood, H. O. and Heck N. H., Editors. Earthquake History of the United States. Soft Cover Booklet. Editors. H. O. and Heck N. H. Wood. Revised (1951) Edition ed. United States Government Printing Office, Washington, D.C.: U.S. Department of Commerce, Coast and Geodetic Survey, 1951. Woollard, G. P. "A Catalogue of Earthquakes in the United States Prior to 1925." Publication of the Hawaii Institute of Geophysics .June (1968): 1-200. ======================================================== 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 =========================================================================