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1925 Montana Earthquake
The 1925 Montana (Clarkston Valley) earthquake occurred at 17:21:12 MDT on 27 June in Montana, with the epicenter being located near Townsend. The earthquake had a magnitude of 6.9 in the surface wave magnitude scale. A maximum intensity of IX ''(Violent)'' was observed. Serious damage was reported near the epicenter. 3 hours after the mainshock, a strong aftershock was recorded with an unknown magnitude that also caused damage. Tectonic setting The epicenter area, Clarkston Valley is a valley surrounded by mountains of severely folded Mesozoic and older rocks and floored with tertiary lake beds and recent alluvium. Physiographic evidences indicate that the Clarkston Valley is a structural depression on the east by a fault of post-Miocene age. Presumably the origin of the earthquake was on this fault at a considerable depth below the surface. In the neighborhood of Deer Lodge several faults of apparently small extent that trend northwestward are mapped by the geologists o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
International Seismological Centre
The International Seismological Centre (ISC) is a non-governmental, nonprofit organisation charged with the final collection, definitive analysis and publication of global seismicity. The ISC was formed in 1964 as an international organisation independent of national governments that would carry on the work of the International Seismological Summary in collecting and analyzing seismic data from around the world, and particularly to handle increased flow of data from the World-Wide Standard Seismograph Network (WWSSN), also established that year. The ISC considers its prime task to be the collection and re-analysis of all available earthquake seismic date in order to produce definitive data on earthquakes. The ISC's catalog is considered "the most complete and authoritative final depository of global earthquake parameter data." Purpose The main scientific goal of the Centre is the definitive compilation of earthquake information and the readings on which they are based. Collecti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |