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The December 1872 Washington state earthquake

Bulletin of the Seismological Society of America

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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. The intensity magnitude, M1, is 6.8 and moment magnitude, M, is 6.5-7.0 at the 95% confidence level.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
The December 1872 Washington state earthquake
Series title:
Bulletin of the Seismological Society of America
Volume
92
Issue:
8
Year Published:
2002
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Bulletin of the Seismological Society of America
First page:
3239
Last page:
3258