Large rock avalanches triggered by the M 7.9 Denali Fault, Alaska, earthquake of 3 November 2002
Engineering Geology
By: R.W. Jibson, E. L. Harp, W. Schulz, and D. K. Keefer
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Abstract
The moment magnitude (M) 7.9 Denali Fault, Alaska, earthquake of 3 November 2002 triggered thousands of landslides, primarily rock falls and rock slides, that ranged in volume from rock falls of a few cubic meters to rock avalanches having volumes as great as 20 ?? 106 m3. The pattern of landsliding was unusual: the number and concentration of triggered slides was much less than expected for an earthquake of this magnitude, and the landslides were concentrated in a narrow zone about 30-km wide that straddled the fault-rupture zone over its entire 300-km length. Despite the overall sparse landslide concentration, the earthquake triggered several large rock avalanches that clustered along the western third of the rupture zone where acceleration levels and ground-shaking frequencies are thought to have been the highest. Inferences about near-field strong-shaking characteristics drawn from interpretation of the landslide distribution are strikingly consistent with results of recent inversion modeling that indicate that high-frequency energy generation was greatest in the western part of the fault-rupture zone and decreased markedly to the east. ?? 2005 Elsevier B.V. All rights reserved.
Suggested Citation
Jibson, R., Harp, E.L., Schulz, W., and Keefer, D.K., 2006, Large rock avalanches triggered by the M 7.9 Denali Fault, Alaska, earthquake of 3 November 2002: Engineering Geology, v. 83, no. 1-3, p. 144-160, https://doi.org/10.1016/j.enggeo.2005.06.029.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Large rock avalanches triggered by the M 7.9 Denali Fault, Alaska, earthquake of 3 November 2002 |
| Series title | Engineering Geology |
| DOI | 10.1016/j.enggeo.2005.06.029 |
| Volume | 83 |
| Issue | 1-3 |
| Year Published | 2006 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Engineering Geology |
| First page | 144 |
| Last page | 160 |