Afterslip, tremor, and the Denali fault earthquake
Bulletin of the Seismological Society of America
By: Joan Gomberg, Stephanie Prejean, and Natalia Ruppert
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Abstract
We tested the hypothesis that afterslip should be accompanied by tremor using observations of seismic and aseismic deformation surrounding the 2002 M 7.9 Denali fault, Alaska, earthquake (DFE). Afterslip happens more frequently than spontaneous slow slip and has been observed in a wider range of tectonic environments, and thus the existence or absence of tremor accompanying afterslip may provide new clues about tremor generation. We also searched for precursory tremor, as a proxy for posited accelerating slip leading to rupture. Our search yielded no tremor during the five days prior to the DFE or in several intervals in the three months after. This negative result and an array of other observations all may be explained by rupture penetrating below the presumed locked zone into the frictional transition zone. While not unique, such an explanation corroborates previous models of megathrust and transform earthquake ruptures that extend well into the transition zone.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Afterslip, tremor, and the Denali fault earthquake |
| Series title | Bulletin of the Seismological Society of America |
| DOI | 10.1785/0120110142 |
| Volume | 102 |
| Issue | 2 |
| Year Published | 2012 |
| Language | English |
| Publisher | Seismological Society of America |
| Publisher location | El Cerrito, CA |
| Contributing office(s) | Earthquake Science Center |
| Description | 8 p. |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Bulletin of the Seismological Society of America |
| First page | 892 |
| Last page | 899 |
| Country | United States |
| State | Alaska |
| Other Geospatial | Denali Fault |
| Google Analytic Metrics | Metrics page |