Slip rate and tremor genesis in Cascadia
Geophysical Research Letters
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Abstract
At many plate boundaries, conditions in the transition zone between seismogenic and stable slip produce slow earthquakes. In the Cascadia subduction zone, these events are consistently observed as slow, aseismic slip on the plate interface accompanied by persistent tectonic tremor. However, not all slow slip at other plate boundaries coincides spatially and temporally with tremor, leaving the physics of tremor genesis poorly understood. Here we analyze seismic, geodetic, and strainmeter data in Cascadia to observe for the first time a large, tremor-generating slow earthquake change from tremor-genic to silent and back again. The tremor falls silent at reduced slip speeds when the migrating slip front pauses as it loads the stronger adjacent fault segment to failure. The finding suggests that rheology and slip-speed-regulated stressing rate control tremor genesis, and the same section of fault can slip both with and without detectable tremor, limiting tremor's use as a proxy for slip.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Slip rate and tremor genesis in Cascadia |
| Series title | Geophysical Research Letters |
| DOI | 10.1002/2013GL058607 |
| Volume | 41 |
| Issue | 2 |
| Year Published | 2014 |
| Language | English |
| Publisher | Wiley |
| Contributing office(s) | Volcano Hazards Program, Volcano Science Center |
| Description | 7 p. |
| First page | 392 |
| Last page | 398 |
| Country | Canada, United States |
| State | British Columbia, California, Oregon, Washington |
| Other Geospatial | Cascadia Subduction Zone |
| Google Analytic Metrics | Metrics page |