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 afr.tab for this catalog follows ==================================== DATA SET TITLE: afr PRINCIPAL INVESTIGATOR: CONTRIBUTING ORGANIZATION: NGDC DATA FILE: afr.bin NUMBER OF RECORDS: 22503 ASCII FILE SIZE: 1845246 BINARY FILE SIZE: 1755234 SUMMARY: This is the composite catalog of earthquake in the region of Africa from the NGDC data base. The time covered is: 1070 to 1995 A.D. The area covered is: 30 N to 60 S 10 W to 50 E The data in this catalog comes from many sources and it 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 AEC USE 22503 century_and_year CENTURY_.LST 4 8 short 0 57 58 short 0 1070 1995 22503 month MONTH.LST 9 10 short 0 59 60 short 0 1 12 22472 day DAY.LST 11 12 short 0 61 62 short 0 1 31 22447 hour HOUR.LST 13 14 short 0 63 64 short 0 1 30 21424 minute MINUTE.LST 15 16 short 0 65 66 short 0 1 59 21894 second SECOND.LST 17 19 short 1 67 68 short 1 1 60 21351 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 1 962 13209 mb_magn MB_MAGN.LST 36 38 short 2 14 15 short 2 3 6 3969 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 18 intensity INTENSIT.CST 44 44 char 0 19 19 char 0 1 X 467 flags_ngdc FLAGS_NG.CST 45 50 char 0 20 25 char 0 T F 27 flag_diastrophic FLAG_DIA.CST 45 45 char 0 26 26 char 0 F F 4 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 S S 1 flag_volcanism FLAG_VOL.CST 48 48 char 0 29 29 char 0 V V 7 flag_non_tectonic FLAG_NON.CST 49 49 char 0 30 30 char 0 E R 12 flag_infrasonic FLAG_INF.CST 50 50 char 0 31 31 char 0 T T 1 Flinn_Engdahl_region FLINN_EN.LST 51 53 short 0 32 33 short 0 156 587 22503 ms_local_magn MS_LOCAL.LST 54 55 short 1 34 35 short 1 3 7 547 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 96 flag_cultural FLAG_CUL.CST 59 59 char 0 37 37 char 0 C F 763 flag_other FLAG_OTH.CST 60 60 char 0 38 38 char 0 M S 3 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 3689 number_of_stations_or_quality NUMBER_O.CST 69 71 char 0 46 48 char 0 1 DA 15457 time_authority TIME_AUT.CST 72 72 char 0 49 49 char 0 ! Z 3629 ml_magn_local ML_MAGN_.LST 73 75 short 2 50 51 short 2 1 7 5358 ml_magn_local_scale ML_MAGN1.CST 76 77 char 0 52 53 char 0 DR NU 5442 ml_magn_local_authority NO HISTOGRAM 78 80 char 0 NOT IN BINARY latitude LATITUDE.LST NOT IN ASCII 4 7 long 3 -60 30 22324 longitude LONGITUD.LST NOT IN ASCII 8 11 long 3 -10 50 22466 depth_negate DEPTH_NE.LST NOT IN ASCII 12 13 short 0 -962 0 13209 magn_other MAGN_OTH.LST NOT IN ASCII 39 40 short 2 1 8 9187 magn_other_authority MAGN_OT1.CST NOT IN ASCII 41 43 char 0 BDA UPP 9203 ml_magn_local_source ML_MAGN2.CST NOT IN ASCII 54 56 char 0 AAE TRI 5442 year_decimal YEAR_DEC.LST NOT IN ASCII 71 78 double 10 1070.150 1995.665 22503 ==================================== 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 afr.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 afr.dat follow ======================================================== SIG 10700225000000030000N 31100E 0 553 C 000SIG SIG 1071 14100N 43200E 0 8 555 D 000SIG SIG 12010705000000028000N 33000E 0 9 553 D 000SIG SIG 12010705000000028000N 33000E 0 9 553 D 000SIG SIG 1358 14100N 43200E 0 8 555 D 000SIG SIG 1377 12400N 45100E 0 559 C 000SIG GOU 1400 13500N 41870E 10 558 F !600MLGOU SIG 1426 14100N 43200E 0 E 555 D 000SIG GOU 1431 13000N 41000E 5 558 F !500MLGOU GOU 1433 14100N 38700E 10 558 F !500MLGOU . . . . PDE 199507300222486 9642S 28507E 1041 MB 567 G 11?450LGBUL PDE 19950804011454025179N 36425E 1043 MB 555 G 19* PDE 19950807070934112049N 44317E 1045 MB 55548MS G 32* PDE 19950808174152526351S 27360E 538 MB 584 340PRE G 13 360LGBUL PDE 19950810004104415473S 41604E 1051 MB 58250MS 530HRV G243 PDE 19950811115258626360S 27399E 542 MB 584 G 11?420LGBUL PDE 19950820120049812162N 44187E 1045 MB 55544MS G 51* PDE 199508261427475 2073N 31354E 3340 MB 568 N 11? PDE 19950827175100248004S 32018E 1052 MB 43147MS 520HRV G 53 PDE 19950831230519529194N 34819E 10 553 G 7?370MLJER ==================================== Variable File This file contains statistical information on each of the variables in the data set. The variable file afr.var for this catalog follows ==================================== Input file : afr.bin Input format file: afr.fmt No requested precision, Approximate number of sorting bins = 100 source: 22503 values read minimum: AEC found at record 1559 maximum: USE found at record 1759 Summary file: source.cst Histogram data precision: 0, Number of sorting bins: 90 latitude: 22503 values read minimum: -58.220 found at record 7961 maximum: 30.000 found at record 1 Summary file: latitude.lst Histogram data precision: 0, Number of sorting bins: 61 longitude: 22503 values read minimum: -10.000 found at record 297 maximum: 50.000 found at record 414 Summary file: longitud.lst Histogram data precision: 0, Number of sorting bins: 127 depth_negate: 22503 values read minimum: -962 found at record 490 maximum: 0 found at record 1 Summary file: depth_ne.lst Histogram data precision: 0, Number of sorting bins: 5 mb_magn: 22503 values read minimum: 0.00 found at record 1 maximum: 6.90 found at record 19727 Summary file: mb_magn.lst flag_isoseismal: 22503 values read minimum: found at record 1 maximum: FPS found at record 11960 Summary file: flag_iso.cst intensity: 22503 values read minimum: found at record 1 maximum: X found at record 1261 Summary file: intensit.cst flags_ngdc: 22503 values read minimum: found at record 1 maximum: F found at record 1431 Summary file: flags_ng.cst flag_diastrophic: 22503 values read minimum: found at record 1 maximum: F found at record 1431 Summary file: flag_dia.cst flag_tsunami: 22503 values read minimum: found at record 1 maximum: T found at record 44 Summary file: flag_tsu.cst flag_seiche: 22503 values read minimum: found at record 1 maximum: S found at record 997 Summary file: flag_sei.cst flag_volcanism: 22503 values read minimum: found at record 1 maximum: V found at record 81 Summary file: flag_vol.cst flag_non_tectonic: 22503 values read minimum: found at record 1 maximum: R found at record 11598 Summary file: flag_non.cst flag_infrasonic: 22503 values read minimum: found at record 1 maximum: T found at record 5507 Summary file: flag_inf.cst Histogram data precision: 0, Number of sorting bins: 64 Flinn_Engdahl_region: 22503 values read minimum: 156 found at record 409 maximum: 587 found at record 327 Summary file: Flinn_En.lst Histogram data precision: 0, Number of sorting bins: 6 ms_local_magn: 22503 values read minimum: 0.0 found at record 1 maximum: 7.1 found at record 5700 Summary file: ms_local.lst z_h: 22503 values read minimum: found at record 1 maximum: Z found at record 8370 Summary file: z_h.cst flag_cultural: 22503 values read minimum: found at record 18 maximum: F found at record 7 Summary file: flag_cul.cst flag_other: 22503 values read minimum: found at record 1 maximum: S found at record 21586 Summary file: flag_oth.cst Histogram data precision: 0, Number of sorting bins: 9 magn_other: 22503 values read minimum: 0.00 found at record 1 maximum: 8.30 found at record 671 Summary file: magn_oth.lst magn_other_authority: 22503 values read minimum: found at record 7 maximum: UPP found at record 891 Summary file: magn_ot1.cst international_data_exchange_event: 22503 values read minimum: found at record 1 maximum: found at record 1 Summary file: internat.cst flag_depth_control_PDE: 22503 values read minimum: found at record 1 maximum: N found at record 1369 Summary file: flag_dep.cst number_of_stations_or_quality: 22503 values read minimum: found at record 1 maximum: DA found at record 300 Summary file: number_o.cst time_authority: 22503 values read minimum: found at record 1 maximum: Z found at record 20781 Summary file: time_aut.cst Histogram data precision: 0, Number of sorting bins: 8 ml_magn_local: 22503 values read minimum: 0.00 found at record 1 maximum: 7.20 found at record 7949 Summary file: ml_magn_.lst ml_magn_local_scale: 22503 values read minimum: found at record 1 maximum: NU found at record 19 Summary file: ml_magn1.cst ml_magn_local_source: 22503 values read minimum: found at record 1 maximum: TRI found at record 573 Summary file: ml_magn2.cst Histogram data precision: 0, Number of sorting bins: 108 century_and_year: 22503 values read minimum: 1070 found at record 1 maximum: 1995 found at record 22375 Summary file: century_.lst Histogram data precision: 0, Number of sorting bins: 13 month: 22503 values read minimum: 0 found at record 2 maximum: 12 found at record 16 Summary file: month.lst Histogram data precision: 0, Number of sorting bins: 32 day: 22503 values read minimum: 0 found at record 2 maximum: 31 found at record 318 Summary file: day.lst Histogram data precision: 0, Number of sorting bins: 25 hour: 22503 values read minimum: 0 found at record 1 maximum: 30 found at record 7864 Summary file: hour.lst Histogram data precision: 0, Number of sorting bins: 60 minute: 22503 values read minimum: 0 found at record 1 maximum: 59 found at record 478 Summary file: minute.lst Histogram data precision: 0, Number of sorting bins: 61 second: 22503 values read minimum: 0.0 found at record 1 maximum: 60.0 found at record 111 Summary file: second.lst Histogram data precision: 0, Number of sorting bins: 127 depth: 22503 values read minimum: 0 found at record 1 maximum: 962 found at record 490 Summary file: depth.lst Histogram data precision: 0, Number of sorting bins: 108 year_decimal: 22503 values read minimum: 1070.1508010211 found at record 1 maximum: 1995.6656494007 found at record 22503 Summary file: year_dec.lst ==================================== The bibliographic file afr.bib for this catalog follows ==================================== This is the NGDC Bibliography for East Africa ---. A Catalogue of Felt Earthquakes in Kenya, 1892 - 1969. Kenya: Seismology Unit, Geology Department, University of Nairobi, Kenya, July 1971. Alsinawi, S. A. Baban S. G. and Issa A. S.Xerox Copy. Baghdad, Iraq: Department of Geology, College of Science, University of Baghdad, Jadiriyah, 1985. Fairhead, J. D. and Girdler R. W. "The Seismicity of the Red Sea, Gulf of Aden and Afar Triangle." Phil. Trans. Roy. Soc. Lond. Volume 267 A. (1970): Pages 49-74. Gorshkov, G. P. "The Seismicity of Africa." Review of Natural Resources (1963): 103-51. Gouin, P. "Seismic Zoning in Ethiopia." Bulletin of the Geophysical Observatory .No. 17 (1976): 1-46. Heck, N. H. and Davis R. M. Jr. "A List of Earthquakes Published in 1688." Bulletin of the Seismological Society of America Vol. 36.No. 4 (1946): 363-72. Loupekine, I. S. A Catalogue of Felt Earthquakes in Kenya, 1892 - 1969. Nairobi, Kenya: University of Nairobi, 1971. Wery, A. "Seismic Observations and Meteorology of Ruanda." Communications of the Royal Observatory of Belgium No. 133.Series No. 43: 1-12. This is the NGDC Bibliography for the North Africa Region "Sesimic Activity in Morocco." Monthly Journal of Seismology: Faculty of Sciences of the Service De Physique Du Globe, Rabat, Morocco March (1969): 1-5. ---, Compiler. Résumé Annuel Des Observations Instrumentales Et Des Tremblements De Terre Ressentis Au Maroc En 1968. Xerox Copy, Report. Rabat: Institut Scientifique Cherifien, Service De Physique Du Globe, 1969. Royaume Du Maroc. ---. "Moyen-Orient Et Afrique Du Nord." Mission D'Information Séismologique No. de série: 1759.Novembre-Décembre 1969 (1970): Pages 1-45. Alsinawi, S. A. Baban S. G. and Issa A. S.Xerox Copy. Baghdad, Iraq: Department of Geology, College of Science, University of Baghdad, Jadiriyah, 1985. Committee of Structural Steel Producers of American Iron and Steel Institute. The Agadir, Morocco Earthquake February 29, 1960. New York: American Iron and Steel Institute, 1962. Gorshkov, G. P. "The Seismicity of Africa." Review of Natural Resources (1963): 103-51. Heck, N. H. and Davis R. M. Jr. "A List of Earthquakes Published in 1688." Bulletin of the Seismological Society of America Vol. 36.No. 4 (1946): 363-72. Institut Scientifique Cherifien, Service De Physique Du Globe. "Les Tremblements De Terre R Essentis En 1965 Et 1966 Au Maroc." Bulletin Macroseismique Du Maroc Pour 1965 Et 1966 (1967): Pages 1-12. Observatoire Geophysique Averroes, Section Seismologie Berrechid Maroc. "Bulletin Macroseismique De L'Observatoire Averroes." Royaume Du Maroc, Institut Scientifique, Service De Physique Du Globe Et De Meteorologie. (1963): Pages 1-5. Rothé, J. P., ProfesseurSoft Cover Booklet. Strasbourg, France: Faculte Des Sciences Institut De Physique Du Globe, 1962. Various. Letter to U.S. Coast & Geodetic Survey. 1959. This is the NGDC Bibliography for West Africa "Seismic Activity in Morocco." Monthly Journal of Seismology: Faculty of Sciences of the Service De Physique Du Globe, Rabat, Morocco March (1969): 1-5. Ambraseys, N. N. and Adams R. D. "Seismicity of West Africa." Journal of Geophysics (Annales Geophysicae) .No. 6 (1986): 679-702. Bacon, M. Banson J. K. A.Soft Cover Booklet. London, England: Geology Department, Chelsea College, London, 1980. Gorshkov, G. P. "The Seismicity of Africa." Review of Natural Resources (1963): 103-51. Rothé, J. P., ProfesseurSoft Cover Booklet. Strasbourg, France: Faculte Des Sciences Institut De Physique Du Globe, 1962. This is the NGDC Bibliography for region of South Africa ---, Compiler. Résumé Annuel Des Observations Instrumentales Et Des Tremblements De Terre Ressentis Au Maroc En 1968. Xerox Copy, Report. Rabat: Institut Scientifique Cherifien, Service De Physique Du Globe, 1969. Royaume Du Maroc. ---. A Catalogue of Felt Earthquakes in Kenya, 1892 - 1969. Kenya: Seismology Unit, Geology Department, University of Nairobi, Kenya, July 1971. A Catalogue of Earthquakes in the Lake Kariba Area: 1959 to 1968 (Rhodesia. Epicentres of Local Earthquakes Recorded at Bulawayo, Broken Hill and Chileka: July 1965 to June 1966. Lambert Conformal Conic Projction. 1967. Fernandez, L. M. Ph. D. Catalogue of Earthquakes in Southern Africa and Surrounding Oceans for 1979, 1980, 1981, 1982, 1983. Republic of South Africa Pretoria: Department of Mineral and Energy Affairs, Geological Survey, 1983. Finsen, W. S. "The Statistics of Witwatersrand Earth Tremors, 1938.5 to 1949.0, and The Geographical Distribution of Some South African Earthquakes." Union Observatory Volume 5, Part 10.Circular No.110, 1950, July (1950): Pages 445-56, Catalogue, Pages 459-72. Gorshkov, G. P. "The Seismicity of Africa." Review of Natural Resources (1963): 103-51. Heck, N. H. and Davis R. M. Jr. "A List of Earthquakes Published in 1688." Bulletin of the Seismological Society of America Vol. 36.No. 4 (1946): 363-72. Herrinck, P. Dr. Sc. Séismicité Du Congo Belge., Compilation Des Séismes Observés Aux Stations Climatologiques Entre 1909 Et 1954. Brussel: Académie royale des Sciences coloniales, Chef de la Section géographique du Service météorologique du Congo belge et du Ruand-Urundi, 1959. Institut Scientifique Cherifien, Service De Physique Du Globe. "Les Tremblements De Terre R Essentis En 1965 Et 1966 Au Maroc." Bulletin Macroseismique Du Maroc Pour 1965 Et 1966 (1967): Pages 1-12. Loupekine, I. S. A Catalogue of Felt Earthquakes in Kenya, 1892 - 1969. Nairobi, Kenya: University of Nairobi, 1971. Observatoire Geophysique Averroes, Section Seismologie Berrechid Maroc. "Bulletin Macroseismique De L'Observatoire Averroes." Royaume Du Maroc, Institut Scientifique, Service De Physique Du Globe Et De Meteorologie. (1963): Pages 1-5. Wery, A. "Seismic Observations and Meteorology of Ruanda." Communications of the Royal Observatory of Belgium No. 133.Series No. 43: 1-12. ======================================================== Additional Documentation Any other files contributed to or generated by NGDC as documentation for the data base follows. ======================================================== ======================================================== ======================================================== END OF DOCUMENTATION FILE ======================================================== ======================================================== 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 =========================================================================