Only reported earthquakes with magnitudes of 2.5 or above or intensities of II or above are listed below. In addition, all historic earthquakes are not listed, as records of their occurrences have not yet been discovered. For example, there have undoubtedly been more earthquakes in the Yellowstone National Park area than are shown on this list. As old records and newspapers are examined, more earthquake accounts will be found.
See also https://earthquake.usgs.gov/data/comcat
Explanation
Year: Year that earthquake occurred
Mth: Month that earthquake occurred
Day: Day that earthquake occurred (UTC Time)
Time: Universal Time Coordinated (UTC) Time
N: * if Earthquake occurred on previous day, Mountain Time
Lat: Latitude of epicenter
Long: Longitude of epicenter
mb: Body-wave magnitude
Ms: Surface-wave magnitude
Mag: Magnitude from other scale
Scale: Other magnitude scale used
MD = Coda-length magnitude
MI = Magnitude derived from epicentral intensity
ML = Local (Richter) magnitude
Mw = Moment magnitude
UK = Unknown magnitude scale
Mag: same as above
Scale: same as above
Intensity: Maximum reported intensity
Nst: The total number of seismic stations used to determine earthquake location.
Gap: The largest azimuthal gap between azimuthally adjacent stations (in degrees).
In general, the smaller this number, the more reliable is the calculated horizontal
position of the earthquake. Earthquake locations in which the azimuthal gap
exceeds 180 degrees typically have large location and depth uncertainties.
Clo: Distance to closest station
RMS: The root-mean-square (RMS) travel time residual, in sec, using all weights. This
parameter provides a measure of the fit of the observed arrival times to the
predicted arrival times for this location. Smaller numbers reflect a better
fit of the data. The value is dependent on the accuracy of the velocity model
used to compute the earthquake location, the quality weights assigned to the
arrival time data, and the procedure used to locate the earthquake.
Explo: Was source of earthquake an explosion?
E = Explosion
N = Non-tectonic event
Blank Space = Tectonic event
Source: Sources used by U. S. Geological Survey plus other sources
ABE = Catalog of large earthquakes, 1897-1980 from Abe (1981, 1982,
1984); Abe and Kanamori (1979); and Abe and Noguchi (1983a, b).
BCIS = Catalog of earthquakes listed in the publications of the Bureau
Central International Seismologique (BCIS) for 1935, 1950-1975.
File supplied by NOAA (Rinehart and others, 1985).
BDA = Catalog of large earthquakes, 1897-1977, compiled by Bath and
Duda (1979). File supplied by NOAA (Rinehart and others, 1985).
DNAG = Catalog of North American earthquakes, 1534-1985, compiled for
the Decade of North American Geology (Engdahl and Rinehart, 1991).
EPRI = Catalog of earthquakes of the United States east of the Rocky
Mountains, 1627-1985, compiled by the Electric Power Research
Institute.
ISS = Epicenters listed in the International Seismological Summaries,
1913-1963.
P&S = World-wide seismic moment catalog of earthquakes, 1900-1989
(Pacheco and Sykes, 1992)
PDE = U. S. Geological Survey's Preliminary Determination of
Epicenters - Monthly Listing.
SRA = Catalog of earthquakes occurring in the eastern, central, and
mountain states of the United States, 1534-1986 (Stover and
others, 1984).
USHIS = Catalog of principle earthquakes in each of the 50 states in
the United States, 1568-1989 (Stover and Coffman, 1993).
UU = Catalog of earthquakes compiled by the University of Utah
Seismograph Stations, 1850-1985. Listing through June 1978 by
Arabasz and others (1979).
WSGS = Data from earthquake record compiled by the Wyoming State
Geological Survey.
References
Abe, K., 1981, Magnitudes of large shallow earthquakes from 1904 to 1980: Physics of the Earth and Planetary Interiors, v. 27, p. 72-92. Abe, K., 1982, Magnitude, seismic moment and apparent stress for major deep earthquake: Journal of the Physics of the Earth, v. 30, p. 321-330. Abe, K., 1984, Complements to "magnitudes of large shallow earthquakes from 1904 to 1980": Physics of the Earth and Planetary Interiors, v. 34, p. 17-23. Abe, K., and Kanamori, H., 1979, Temporal variation of the activity of intermediate and deep focus earthquakes: Journal of Geophysical Research, v. 84, no. 87, p. 3589-3595. Abe, K., and Noguchi, S., 1983a, Determination of magnitude for large shallow earthquakes 1898-1917: Physics of the Earth and Planetary Interiors, v. 32, p. 45-59. Abe, K., and Noguchi, S., 1983b, Revision of magnitudes of large shallow earthquakes 1897-1912: Physics of the Earth and Planetary Interiors, v. 33, p. 1-11. Arabasz, W.J., Smith, R.B., and Richins, W.D., 1979, Earthquake studies in Utah 1850-1978: University of Utah Seismograph Stations, Department of Geology and Geophysics, University of Utah, Salt Lake City, Utah, 84112, 552p. Bath, M., and Duda, S.J., 1979, Some aspects of global seismicity: Report No. 1-79, Seismological Institute, Uppsala, Sweden, 41p. Case, J.C., 1993, Geologic Hazards in Wyoming: Wyoming Geo-notes, no. 40, p. 46-48. Case, J.C., Larsen, L.L., Boyd, C.S., and Cannia, J.C., 1995, Earthquake epicenters and suspected active faults with surficial expression in Wyoming: Wyoming State Geological Survey Geologic Hazards Section Interim Report No. 2, scale 1:1,000,000. Engdahl, E.R., and Rinehart, W.A., 1991, Seismicity map of North America, in Slemmons, D.B., Engdahl, E.R., Zoback, M.D., and Blackwell, D.D. (eds.), "Neotectonics of North America": Boulder, CO, The Geological Society of America, Decade Map Volume 1, 21-27. Pacheco, J.F., and Sykes, L.R., 1992, Seismic moment catalog of large shallow earthquakes, 1900 to 1989: Bulletin of the Seismological Society of America, v. 82, no. 3, p. 1306-1349. Rinehart, W., Meyers, H., and von Hake, C.A., 1985, Summary of earthquake data base: Key to Geophysical Records Documentation No. 21, U.S. Department of Commerce, National Geophysical Data Center, Boulder, CO, October 1985. Stover, C.W., Reagor, G., and Algermissen, S.T., 1984, United States earthquake data file: U.S. Geological Survey, Open-File Report 84-225, 123p. Stover, C.W., and Coffman, J.L., 1993, Seismicity of the United States, 1568-1989 (revised): U.S. Geological Survey, Professional Paper 1527, 418p.
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