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 ott.tab for this catalog follows ==================================== DATA SET TITLE: ott PRINCIPAL INVESTIGATOR: CONTRIBUTING ORGANIZATION: OTT LATITUDE: 45.38967 N LONGITUDE: 75.7095 W OTT Elevation: 83.0 LOCATION and NAME: Ottawa DATA FILE: ott.bin #\data\canada\eastern\ott\ott.bin NUMBER OF RECORDS: 12757 ASCII FILE SIZE: 1046074 BINARY FILE SIZE: 995046 SUMMARY: OTT Ottawa, Canada. Canadian Region Data from Ottawa, Canada 1946 - 1994 Canadian earthquake data comes from the Geological Survey of Canada and local observatories. There are a number of useful historical documents as well as data from local networks included on this CD. Contacts for further information on Canadian Earthquakes are: Janet A. Drysdale 1 Observatory Cr. Ottawa, Ontario FAX: 613-922-8836 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 OTT OTT 12757 century_and_year CENTURY_.LST 4 8 short 0 57 58 short 0 1946 1994 12757 month MONTH.LST 9 10 short 0 59 60 short 0 1 12 12757 day DAY.LST 11 12 short 0 61 62 short 0 1 31 12757 hour HOUR.LST 13 14 short 0 63 64 short 0 1 23 12229 minute MINUTE.LST 15 16 short 0 65 66 short 0 1 59 12513 second SECOND.LST 17 19 short 1 67 68 short 1 1 59 12517 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 84 11758 mb_magn MB_MAGN.LST 36 38 short 2 14 15 short 2 4 5 9 MB NO HISTOGRAM 39 40 constant 0 NOT IN BINARY flag_isoseismal FLAG_ISO.CST 41 43 char 0 16 18 char 0 USE USE 1 intensity INTENSIT.CST 44 44 char 0 19 19 char 0 3 8 17 flags_ngdc FLAGS_NG.CST 45 50 char 0 20 25 char 0 E R 4 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 E R 4 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 18 682 12757 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 C H 96 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 A A 1 number_of_stations_or_quality NUMBER_O.CST 69 71 char 0 46 48 char 0 1 382 10625 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 -1 6 10706 ml_magn_local_scale ML_MAGN1.CST 76 77 char 0 52 53 char 0 LG NU 12251 ml_magn_local_authority NO HISTOGRAM 78 80 char 0 NOT IN BINARY latitude LATITUDE.LST NOT IN ASCII 4 7 long 3 46 79 12757 longitude LONGITUD.LST NOT IN ASCII 8 11 long 3 -134 -53 12757 depth_negate DEPTH_NE.LST NOT IN ASCII 12 13 short 0 -84 0 11758 magn_other MAGN_OTH.LST NOT IN ASCII 39 40 short 2 3 7 16 magn_other_authority MAGN_OT1.CST NOT IN ASCII 41 43 char 0 NEI WES 16 ml_magn_local_source ML_MAGN2.CST NOT IN ASCII 54 56 char 0 NEI WES 12251 year_decimal YEAR_DEC.LST NOT IN ASCII 71 78 double 10 1946.475 1994.542 12757 ==================================== 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 ott.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 ott.dat follow ======================================================== OTT 19460623171319 499 N1253 W USE8 025 D 73 PAS OTT 19600423114752 47533N 703 W 447 4 OTT OTT 19600423114752047533N 70300W 0 447 400OTT OTT 19600704125147 52 N131 W 022 OTT 19600704125147052000N131000W 0 022 OTT 196107052243441503 N 667 W 33 449 5 OTT A OTT 19620225060550049000N128500W 0 025 350OTT OTT 19740105111019072750N 89880W 0 682 OTT 19740106073536047270N 69910W 0 448 140MLOTT OTT 19740106163330052090N118110W 0 023 . . . . OTT 19940626053132050028N129539W 10 025 4 270MLOTT OTT 19940626115431050334N130149W 10 025 5 220MLOTT OTT 19940627073230049211N126800W 20 025 5 190MLOTT OTT 19940628205144049552N122398W 3 023 4 100MLOTT OTT 19940708014316049349N 67030W 16 447 11 270MLOTT OTT 19940708015415049347N 67031W 21 447 6 240MLOTT OTT 19940714124152047025N 66616W 5 451 15 409MLOTT OTT 19940714125518047704N 68002W 18 448 17 260MLOTT OTT 19940717093504049053N 67405W 18 447 5 150MLOTT OTT 19940718043153046966N 66617W 18 451 13 220MLOTT ==================================== Variable File This file contains statistical information on each of the variables in the data set. The variable file ott.var for this catalog follows ==================================== Input file : ott.bin Input format file: ott.fmt No requested precision, Approximate number of sorting bins = 100 source: 12757 values read minimum: OTT found at record 1 maximum: OTT found at record 1 Summary file: source.cst Histogram data precision: 0, Number of sorting bins: 34 latitude: 12757 values read minimum: 46.322 found at record 11404 maximum: 79.941 found at record 1969 Summary file: latitude.lst Histogram data precision: 0, Number of sorting bins: 82 longitude: 12757 values read minimum: -133.571 found at record 4152 maximum: -52.069 found at record 12466 Summary file: longitud.lst Histogram data precision: 0, Number of sorting bins: 76 depth_negate: 12757 values read minimum: -84 found at record 12293 maximum: 0 found at record 1 Summary file: depth_ne.lst Histogram data precision: 0, Number of sorting bins: 3 mb_magn: 12757 values read minimum: 0.00 found at record 1 maximum: 5.40 found at record 3312 Summary file: mb_magn.lst flag_isoseismal: 12757 values read minimum: found at record 2 maximum: USE found at record 1 Summary file: flag_iso.cst intensity: 12757 values read minimum: found at record 2 maximum: 8 found at record 1 Summary file: intensit.cst flags_ngdc: 12757 values read minimum: found at record 1 maximum: R found at record 3424 Summary file: flags_ng.cst flag_diastrophic: 12757 values read minimum: found at record 1 maximum: found at record 1 Summary file: flag_dia.cst flag_tsunami: 12757 values read minimum: found at record 1 maximum: found at record 1 Summary file: flag_tsu.cst flag_seiche: 12757 values read minimum: found at record 1 maximum: found at record 1 Summary file: flag_sei.cst flag_volcanism: 12757 values read minimum: found at record 1 maximum: found at record 1 Summary file: flag_vol.cst flag_non_tectonic: 12757 values read minimum: found at record 1 maximum: R found at record 3424 Summary file: flag_non.cst flag_infrasonic: 12757 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: 33 Flinn_Engdahl_region: 12757 values read minimum: 18 found at record 217 maximum: 682 found at record 8 Summary file: Flinn_En.lst Histogram data precision: 0, Number of sorting bins: 1 ms_local_magn: 12757 values read minimum: 0.0 found at record 1 maximum: 0.0 found at record 1 Summary file: ms_local.lst z_h: 12757 values read minimum: found at record 1 maximum: found at record 1 Summary file: z_h.cst flag_cultural: 12757 values read minimum: found at record 2 maximum: H found at record 9745 Summary file: flag_cul.cst flag_other: 12757 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: 5 magn_other: 12757 values read minimum: 0.00 found at record 4 maximum: 7.30 found at record 1 Summary file: magn_oth.lst magn_other_authority: 12757 values read minimum: found at record 4 maximum: WES found at record 849 Summary file: magn_ot1.cst international_data_exchange_event: 12757 values read minimum: found at record 1 maximum: found at record 1 Summary file: internat.cst flag_depth_control_PDE: 12757 values read minimum: found at record 1 maximum: A found at record 6 Summary file: flag_dep.cst number_of_stations_or_quality: 12757 values read minimum: found at record 1 maximum: 382 found at record 5627 Summary file: number_o.cst time_authority: 12757 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: 8 ml_magn_local: 12757 values read minimum: -0.70 found at record 1492 maximum: 6.90 found at record 2497 Summary file: ml_magn_.lst ml_magn_local_scale: 12757 values read minimum: found at record 1 maximum: NU found at record 8875 Summary file: ml_magn1.cst ml_magn_local_source: 12757 values read minimum: found at record 1 maximum: WES found at record 874 Summary file: ml_magn2.cst Histogram data precision: 0, Number of sorting bins: 25 century_and_year: 12757 values read minimum: 1946 found at record 1 maximum: 1994 found at record 12393 Summary file: century_.lst Histogram data precision: 0, Number of sorting bins: 12 month: 12757 values read minimum: 1 found at record 8 maximum: 12 found at record 78 Summary file: month.lst Histogram data precision: 0, Number of sorting bins: 31 day: 12757 values read minimum: 1 found at record 166 maximum: 31 found at record 58 Summary file: day.lst Histogram data precision: 0, Number of sorting bins: 24 hour: 12757 values read minimum: 0 found at record 22 maximum: 23 found at record 45 Summary file: hour.lst Histogram data precision: 0, Number of sorting bins: 60 minute: 12757 values read minimum: 0 found at record 31 maximum: 59 found at record 255 Summary file: minute.lst Histogram data precision: 0, Number of sorting bins: 60 second: 12757 values read minimum: 0.0 found at record 13 maximum: 59.9 found at record 9691 Summary file: second.lst Histogram data precision: 0, Number of sorting bins: 76 depth: 12757 values read minimum: 0 found at record 1 maximum: 84 found at record 12293 Summary file: depth.lst Histogram data precision: 0, Number of sorting bins: 25 year_decimal: 12757 values read minimum: 1946.4759385781 found at record 1 maximum: 1994.5429830353 found at record 12757 Summary file: year_dec.lst ==================================== The bibliographic file ott.bib for this catalog follows ==================================== This is the NGDC Bibliography for the Canada Region "A Chapter on Earthquakes." The Canadian Naturalist and Geologist Vol. 1.May (1856): 1-5. ---, Author. Earthquakes of Eastern Canada and Adjacent Areas 1534-1927. Soft Cover Booklet, Report. Volume XXVI. Ottawa, Canada: Department of Mines and Technical Surveys, Observatories Branch, 1962. ---. "Location of Epicentres for 1912." The Journal of The Royal Astoonomical Society of Canada Vol. 7.No. 3. (1913): 229-41. ---. "Location of Epicentres for 1913." The Journal of the Royal Astronomical Society of Canada May-June (1914): 160-71. ---. "Location of Epicentres for 1914 and 1915." The Journal of the Royal Astronomical Society of Canada July - August (1916): 302-13. ---. "Loction of Epicentres for 1914." The Journal of the Royal Astronomical Society of Canada (1914): 215-23. ---. Canadian Earthquakes--1978. Ottawa, Canada: Seismological Service of Canada, 1979. Doxsee, W. W. "The Location of Epicenters, 1926-1927." Publications of the Dominion Observatory of Ottawa Vol. 7.No. 5 (1930): 191-259. Drysdale, J. A., AuthorsSoft Cover Book. (Seismological Series) Série Séismologique (Number 95) Numéro 95. Canada: Energy, Mines and Resources Canada, 1987. (Paper 87-19) Etude 87-19. 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. "There Are Earthquake Risks in Canada." Dominion Observatory, Department of Mines and Technical Surveys, Ottawa, Ontario, Reprinted From "Canadian Consulting Engineer" Volume 7.No. 7, (1965): Pages 42-51. Horner, R. B. Stevens A. E. and Wetmiller R. J. Canadian Earthquakes--1977. Ottawa, Canada: Seismological Service of Canada, 1979. 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. Klotz, O. "Location of Epicentres for 1911." The Journal of the Royal Astronomical Society of Canada Vol. 6.No. 1 (1912): 15-23. 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. Milne, W. G. "Seismic Activity in Canada, West of the 113th Meridian 1841 - 1951." Publications of the Dominion Observatory Vol. 18.No. 7 (1964): 119-46. Milne, W. G. "Seismic Activity in Canada, West of the 113th Meridian 1841-1951." Publications of the Dominion Observatory Ottawa Volume IVIII.No. 7 (1956): Pages 119-46. Milne, W. G. Rogers G. C. Riddihough R. P. McMechan G. A. and Hyndman R. D. "Seismicity of Western Canada." Can. J. Earth Sci. (Canadian Journal of Earth Sciences) Volume 15 (1978): Pages 1170-91. Milne, W. G. and Lucas K. A. "Seismic Activity in Western Canada, 1955 to 1959 Inclusive." Publications of the Dominion Observatory (1961): Page 3-23. 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. Roberts, E. B., Captain, C&GS, Chief, Geophysics Division. "Earthquakes in the Vicinity of Iceland, Greenland and Baffin Island From 1933 to the Present." Xerox copy, datafileRoberts, E.B., 1959. Smith, W. E. T.W. E. T. Smith. 1966-2 ed. Seismological Series of the Dominion Observatory . Ottawa, Canada: Department of Energy, Mines and Resources, Observatories Branch, 1967. Stevens, A. E. Milne W. G. Horner R. B. Wetmiller R. J. Leblanc G. and McMechan G. A. Canadian Earthquakes--1968. Ottawa, Canada: Seismological Service of Canada, 1976. Wetmiller, R. J. "An Earthquake Swarm on the Queen Charlotte Islands Fracture Zone." Bulletin of the Seismological Society of America Vol. 61.No. 6 (1971): 1489-505. Wetmiller, R. J. Canadian Earthquakes--1974. Ottawa, Canada: Seismological Service of Canada, 1976. Wetmiller, R. J. Stevens A. E. and Horner R. B. Canadian Earthquakes--1979. Ottawa, Canada: Seismological Service of Canada, 1981. Wetmiller, R. J. and Horner R. B. Canadian Earthquakes--1976. Ottawa, Canada: Seismological Service of Canada, 1978. ======================================================== 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 =========================================================================