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 indoc.tab for this catalog follows ==================================== DATA SET TITLE: indoc PRINCIPAL INVESTIGATOR: CONTRIBUTING ORGANIZATION: NGDC DATA FILE: indoc.bin NUMBER OF RECORDS: 6057 ASCII FILE SIZE: 496674 BINARY FILE SIZE: 472446 SUMMARY: This is the composite catalog for the Indian Ocean region from NGDC. The time period covered is: 1618 A. D. to 1995 A.D. The region covered is: 60S to 20N 50E to 90E This is a composite catalog from many sources and contains multiple listings for the same event. 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 SYK 6057 century_and_year CENTURY_.LST 4 8 short 0 57 58 short 0 1618 1995 6057 month MONTH.LST 9 10 short 0 59 60 short 0 1 12 6057 day DAY.LST 11 12 short 0 61 62 short 0 1 31 6057 hour HOUR.LST 13 14 short 0 63 64 short 0 1 23 5751 minute MINUTE.LST 15 16 short 0 65 66 short 0 1 59 5975 second SECOND.LST 17 19 short 1 67 68 short 1 1 59 5913 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 1 651 4740 mb_magn MB_MAGN.LST 36 38 short 2 14 15 short 2 3 6 4017 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 12 intensity INTENSIT.CST 44 44 char 0 19 19 char 0 3 6 12 flags_ngdc FLAGS_NG.CST 45 50 char 0 20 25 char 0 T T 2 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 T T 2 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 0 314 705 6057 ms_local_magn MS_LOCAL.LST 54 55 short 1 34 35 short 1 3 7 609 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 145 flag_cultural FLAG_CUL.CST 59 59 char 0 37 37 char 0 C F 48 flag_other FLAG_OTH.CST 60 60 char 0 38 38 char 0 0 0 0 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 0 0 0 flag_depth_control_PDE FLAG_DEP.CST 68 68 char 0 45 45 char 0 * N 1781 number_of_stations_or_quality NUMBER_O.CST 69 71 char 0 46 48 char 0 1 625 4293 time_authority TIME_AUT.CST 72 72 char 0 49 49 char 0 * W 906 ml_magn_local ML_MAGN_.LST 73 75 short 2 50 51 short 2 4 6 120 ml_magn_local_scale ML_MAGN1.CST 76 77 char 0 52 53 char 0 DR MW 125 ml_magn_local_authority NO HISTOGRAM 78 80 char 0 NOT IN BINARY latitude LATITUDE.LST NOT IN ASCII 4 7 long 3 -60 20 5965 longitude LONGITUD.LST NOT IN ASCII 8 11 long 3 50 90 6057 depth_negate DEPTH_NE.LST NOT IN ASCII 12 13 short 0 -651 0 4740 magn_other MAGN_OTH.LST NOT IN ASCII 39 40 short 2 2 8 1125 magn_other_authority MAGN_OT1.CST NOT IN ASCII 41 43 char 0 BDA UPP 1127 ml_magn_local_source ML_MAGN2.CST NOT IN ASCII 54 56 char 0 BJI SEA 125 year_decimal YEAR_DEC.LST NOT IN ASCII 71 78 double 10 1618.380 1995.658 6057 ==================================== 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 indoc.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 indoc.dat follow ======================================================== SIG 16180520000000019000N 72800E 0 314 D 000SIG SIG 18430401000000019000N 77000E 0 314 C 000SIG BDA 190904292234 27 S 63 E 60 428 7 BDA 33 G-R 19090429224112 35 S 53 E 428 68 PAS G-R 19120511172624 9 S 72 E 426 68 PAS BDA 19130119170515 2 N 86 E 60 420 74 BDA 33 ISS 191301191705150 1000N 88000E 0 420 ISS 19160407092603029000S 53500E 0 425 ISS 191605091433270 500N 88500E 0 420 G-R 19160509143342 15 N 89 E 420 63 PAS . . . . PDE 19950805014725610099N 56929E 1039 MB 421 G 11* PDE 19950806192905215725N 59631E 1047 MB 41743MS G 81 PDE 199508172324594 9238N 58025E 1049 MB 42148MS G 50 PDE 199508172339220 9048N 58115E 1050 MB 42148MS 540HRV G104 PDE 199508172347579 9332N 58057E 1044 MB 421 G 20* PDE 19950822011924842230S 88467E 1042 MB 43544MS G 11? PDE 19950822012941542063S 88222E 1040 MB 435 G 6? PDE 19950826033933520164S 66647E 1047 MB 42746MS G 15* PDE 19950827162758425570S 69638E 1044 MB 425 G 24* PDE 199508291245257 7575S 67964E 1049 MB 429 540HRV G103 ==================================== Variable File This file contains statistical information on each of the variables in the data set. The variable file indoc.var for this catalog follows ==================================== Input file : indoc.bin Input format file: indoc.fmt No requested precision, Approximate number of sorting bins = 100 source: 6057 values read minimum: BCI found at record 512 maximum: SYK found at record 638 Summary file: source.cst Histogram data precision: 0, Number of sorting bins: 72 latitude: 6057 values read minimum: -57.992 found at record 3207 maximum: 20.000 found at record 399 Summary file: latitude.lst Histogram data precision: 0, Number of sorting bins: 41 longitude: 6057 values read minimum: 50.000 found at record 46 maximum: 90.000 found at record 13 Summary file: longitud.lst Histogram data precision: 0, Number of sorting bins: 130 depth_negate: 6057 values read minimum: -651 found at record 2537 maximum: 0 found at record 1 Summary file: depth_ne.lst Histogram data precision: 0, Number of sorting bins: 5 mb_magn: 6057 values read minimum: 0.00 found at record 1 maximum: 6.70 found at record 4558 Summary file: mb_magn.lst flag_isoseismal: 6057 values read minimum: found at record 1 maximum: FPS found at record 3182 Summary file: flag_iso.cst intensity: 6057 values read minimum: found at record 1 maximum: 6 found at record 886 Summary file: intensit.cst flags_ngdc: 6057 values read minimum: found at record 1 maximum: T found at record 3652 Summary file: flags_ng.cst flag_diastrophic: 6057 values read minimum: found at record 1 maximum: found at record 1 Summary file: flag_dia.cst flag_tsunami: 6057 values read minimum: found at record 1 maximum: T found at record 3652 Summary file: flag_tsu.cst flag_seiche: 6057 values read minimum: found at record 1 maximum: found at record 1 Summary file: flag_sei.cst flag_volcanism: 6057 values read minimum: found at record 1 maximum: found at record 1 Summary file: flag_vol.cst flag_non_tectonic: 6057 values read minimum: found at record 1 maximum: found at record 1 Summary file: flag_non.cst flag_infrasonic: 6057 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: 25 Flinn_Engdahl_region: 6057 values read minimum: 314 found at record 1 maximum: 705 found at record 401 Summary file: Flinn_En.lst Histogram data precision: 0, Number of sorting bins: 6 ms_local_magn: 6057 values read minimum: 0.0 found at record 1 maximum: 7.6 found at record 3652 Summary file: ms_local.lst z_h: 6057 values read minimum: found at record 1 maximum: Z found at record 2492 Summary file: z_h.cst flag_cultural: 6057 values read minimum: found at record 3 maximum: F found at record 531 Summary file: flag_cul.cst flag_other: 6057 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: 8 magn_other: 6057 values read minimum: 0.00 found at record 1 maximum: 8.10 found at record 202 Summary file: magn_oth.lst magn_other_authority: 6057 values read minimum: found at record 7 maximum: UPP found at record 1054 Summary file: magn_ot1.cst international_data_exchange_event: 6057 values read minimum: found at record 1 maximum: found at record 1 Summary file: internat.cst flag_depth_control_PDE: 6057 values read minimum: found at record 1 maximum: N found at record 977 Summary file: flag_dep.cst number_of_stations_or_quality: 6057 values read minimum: found at record 1 maximum: 625 found at record 5862 Summary file: number_o.cst time_authority: 6057 values read minimum: found at record 1 maximum: W found at record 5855 Summary file: time_aut.cst Histogram data precision: 0, Number of sorting bins: 4 ml_magn_local: 6057 values read minimum: 0.00 found at record 1 maximum: 6.40 found at record 5680 Summary file: ml_magn_.lst ml_magn_local_scale: 6057 values read minimum: found at record 1 maximum: MW found at record 5862 Summary file: ml_magn1.cst ml_magn_local_source: 6057 values read minimum: found at record 1 maximum: SEA found at record 5855 Summary file: ml_magn2.cst Histogram data precision: 0, Number of sorting bins: 83 century_and_year: 6057 values read minimum: 1618 found at record 1 maximum: 1995 found at record 5972 Summary file: century_.lst Histogram data precision: 0, Number of sorting bins: 12 month: 6057 values read minimum: 1 found at record 6 maximum: 12 found at record 14 Summary file: month.lst Histogram data precision: 0, Number of sorting bins: 31 day: 6057 values read minimum: 1 found at record 2 maximum: 31 found at record 113 Summary file: day.lst Histogram data precision: 0, Number of sorting bins: 24 hour: 6057 values read minimum: 0 found at record 1 maximum: 23 found at record 46 Summary file: hour.lst Histogram data precision: 0, Number of sorting bins: 60 minute: 6057 values read minimum: 0 found at record 1 maximum: 59 found at record 71 Summary file: minute.lst Histogram data precision: 0, Number of sorting bins: 60 second: 6057 values read minimum: 0.0 found at record 1 maximum: 59.9 found at record 1664 Summary file: second.lst Histogram data precision: 0, Number of sorting bins: 130 depth: 6057 values read minimum: 0 found at record 1 maximum: 651 found at record 2537 Summary file: depth.lst Histogram data precision: 0, Number of sorting bins: 83 year_decimal: 6057 values read minimum: 1618.3809380074 found at record 1 maximum: 1995.6589905410 found at record 6057 Summary file: year_dec.lst ==================================== The bibliographic file indoc.bib for this catalog follows ==================================== This is the NGDC Bibliography for the Oceania Region ---. "Earthquake-Origins in the South-West Pacific in 1910." Transactions of the New Zealand Institute Vol. 44.Bulletin 39 (Hector Observatory) (1912): 139-42. ---. "Seismicity of the South Atlantic." Journal of Geophysical Research Vol. 73.No. 12 (1968): 3807-20. ---. "The Seismicity of the Arctic." Bulletin of the Seismological Society of America Vol. 55.No. 2 (1965): 501-18. ---. "The Seismicity of the Lower South Antilles." Journal for Geophysics Year 6.Book 4 - 7: 361-69. . "Damaging Earthquake Reports for Guam." Xerox Copy, Data file. Hodgson, E. A. "The Seismicity of the Arctic." Journal of the Royal Astronomical Society of Canada Volume XXIV, No. 5.May-June, 1930 (1930): Pages 201-10. Hodgson, J. H. Bath M. Jensen H. Kvale A. Linden N. A. Murphy L. M. Shebalin N. V. Tryggvason E. and Vesanen E. "Seismicity of the Arctic." Annals of the International Geophysical Year Vol. 30: 33-66. Hodgson, J. H. Båth M. Jensen H. Kvale A. Linden N. A. Murphy L. M. Shebalin N. V. Tryggvason E. and Vesanen E. "Seismicity of the Arctic." Reprinted From Annals of the International Geophysical Year Volume XXX--Seismology: Pages 33-66. Hogben, G. "Earthquake-Origins in the South-West Pacific in 1910." Transactions of the New Zealand Institute, Dominion Observatory Volume XLIV.Dominion Observarory Bulletin No. S 4 (1912): Pages 139-42. Keith, A. Hodgson E. A. de Smitt V. P. et. al. "The Grandbanks Earthquake of 1929." Nature, Dominion Observatory, Western Union Telegraph Company, Eastern Section of the Seismological Society of America, Et. Al. (1929-1964): Various. Stover, C. W. "Seismicity of the Indian Ocean." Journal of Geophysical Research Vol. 71.No. 10 (1966): 2575-81. Sykes, L. R. "Seismicity of the South Pacific Ocean." Journal of Geophysical Research Volume 68.No. 21 (1963): Pages 5999. Tams, E. "Die Seismischen Verhältnisse Des Offenen Atlantischen Ozeans." Sonderdruck Aus Gerlands Beiträge Zur Geophysik. Bd. IVIII.Heft 3 (1927): Pages 319-53. ======================================================== 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 =========================================================================