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Extraordinary distance limits of landslides triggered by the 2011 Mineral, Virginia, earthquake

Bulletin of the Seismological Society of America

By:
and
DOI: 10.1785/0120120055

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Abstract

The 23 August 2011 Mineral, Virginia, earthquake (Mw 5.8) was the largest to strike the eastern U.S. since 1897 and was felt over an extraordinarily large area. Although no large landslides occurred, the shaking did trigger many rock and soil falls from steep river banks and natural cliffs in the epicentral area and from steep road cuts along, and northwest of, the Blue Ridge Parkway. We mapped the occurrence of rock falls to determine distance limits that could be compared with those from other documented earthquakes. Studies of previous earthquakes indicated a maximum epicentral distance limit for landsliding of ~60  km for an M 5.8 earthquake; the maximum distance limit for the 2011 earthquake was 245 km, the largest exceedance of the historical limit ever recorded. Likewise, the previous maximum area affected by landslides for this magnitude was 1500  km2; the area affected by landslides in the 2011 earthquake was 33,400  km2. These observations provide physical evidence that attenuation of strong shaking for eastern U.S. earthquakes is significantly lower than for plate‐boundary earthquakes. Also, distance limits parallel to the regional structural trend are greater than those that transect the structure, which suggests anisotropic attenuation related to the regional geologic structure. Peak ground acceleration (PGA) at the landslide distance limits is estimated to have been about 0.02–0.04g.

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Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Extraordinary distance limits of landslides triggered by the 2011 Mineral, Virginia, earthquake
Series title:
Bulletin of the Seismological Society of America
DOI:
10.1785/0120120055
Volume
102
Issue:
6
Year Published:
2012
Language:
English
Publisher:
Seismological Society of America
Publisher location:
El Cerrito, CA
Contributing office(s):
Geologic Hazards Science Center
Description:
10 p.
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Bulletin of the Seismological Society of America
First page:
2368
Last page:
2377
Country:
United States
State:
Virginia
City:
Mineral