Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 41, Issue 2, Pages 392-398Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/2013GL058607
Keywords
tectonic tremor; slow slip; episodic tremor and slip; slip rate; subduction zones; Cascadia
Categories
Funding
- Division Of Earth Sciences
- Directorate For Geosciences [1261833] Funding Source: National Science Foundation
Ask authors/readers for more resources
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. Key Points Slip speed regulates tremor Same event and same fault can slip with and without detected tremor Fault segmentation inhibits slow slip propagation
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available