publication . Article . 2002

The December 1872 Washington State Earthquake

William H. Bakun; Ralph A. Haugerud; Margaret G. Hopper; Ruth S. Ludwin;
Open Access
  • Published: 01 Dec 2002 Journal: Bulletin of the Seismological Society of America, volume 92, pages 3,239-3,258 (issn: 0037-1106, Copyright policy)
  • Publisher: Seismological Society of America (SSA)
Abstract
The largest historical earthquake in eastern Washington occurred on 15 December 1872. We used Modified Mercalli intensity (MMI) assignments for 12 twentieth-century earthquakes to determine attenuation relations for different regions in the Pacific Northwest. MMI attenuation for propagation paths east and west of the Cascade Mountains differs significantly only for epicentral distances greater than about 225 km. We used these attenuation relations and the MMI assignments for the 15 December 1872 earthquake to conclude that its epicentral region was east of the Cascade Mountains near Lake Chelan, Washington, and most probably near the south end of Lake Chelan. Th...
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Subjects
free text keywords: Geochemistry and Petrology, Geophysics, Geology, Mercalli intensity scale, Magnitude (mathematics), Seismology, Attenuation, Moment magnitude scale
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