Reconsidering earthquake scaling
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Abstract
The relationship (scaling) between scalar moment, M0, and duration, T, potentially provides key constraints on the physics governing fault slip. The prevailing interpretation of M0-T observations proposes different scaling for fast (earthquakes) and slow (mostly aseismic) slip populations and thus fundamentally different driving mechanisms. We show that a single model of slip events within bounded slip zones may explain nearly all fast and slow slip M0-T observations, and both slip populations have a change in scaling, where the slip area growth changes from 2-D when too small to sense the boundaries to 1-D when large enough to be bounded. We present new fast and slow slip M0-T observations that sample the change in scaling in each population, which are consistent with our interpretation. We suggest that a continuous but bimodal distribution of slip modes exists and M0-T observations alone may not imply a fundamental difference between fast and slow slip.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Reconsidering earthquake scaling |
| Series title | Geophysical Research Letters |
| DOI | 10.1002/2016GL069967 |
| Volume | 43 |
| Issue | 12 |
| Year Published | 2016 |
| Language | English |
| Publisher | American Geophysical Union |
| Contributing office(s) | Earthquake Science Center |
| Description | 9 p. |
| First page | 6243 |
| Last page | 6251 |
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