| 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. |
| Genre: | Article |
| ProdID: | 70041948 |
| Citation Author: | Gomberg, Joan ; Prejean, Stephanie ; Ruppert, Natalia |
| Citation Contributing Office: | Earthquake Science Center |
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| Citation End Page: | 899 |
| Citation Issue: | 2 |
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| Citation Language: | English |
| Citation Larger Work Title: | Bulletin of the Seismological Society of America |
| Citation LatN: | 71.39 |
| Citation LatS: | 51.21 |
| Citation LonE: | -129.99 |
| Citation LonW: | 172.45 |
| Citation Month: | APR |
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| Citation Phsyical Description: | 8 p. |
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| Citation Publisher: | Seismological Society of America |
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| Citation Search Results Text: | Afterslip, tremor, and the Denali fault earthquake; 2012; Article; Journal; Bulletin of the Seismological Society of America; Gomberg, Joan ; Prejean, Stephanie ; Ruppert, Natalia |
| Citation Start Page: | 892 |
| Citation Volume: | 102 |
| Citation Year: | 2012 |
| Type: | citation/reference |
| Text: | Afterslip, tremor, and the Denali fault earthquake; 2012; Article; Journal; Bulletin of the Seismological Society of America; Gomberg, Joan ; Prejean, Stephanie ; Ruppert, Natalia |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1785/0120110142 |
| Date Other: | Wed, 19 Dec 2012 00:00 -0600 |
| Publisher: | Seismological Society of America |
