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Unraveling earthquake stresses: Insights from dynamically triggered earthquakes
Richard Alfaro-Diaz, Los Alamos National Lab


Earthquake triggering has been shown to occur in a variety of
settings and with a suite of proposed mechanisms. Small earthquakes, non-volcanic tremor, and even volcanic responses can be triggered dynamically from the seismic wave arrivals of large earthquakes. Static triggering results from increased stress from the fault motion of a nearby large earthquake, and generally is the dominant form of triggering within two fault lengths of a large earthquake. Induced earthquakes have been triggered through wastewater injection in certain parts of the U.S. In sum, dynamic, static, and induced seismicity result from stress changes near
triggered faults and/or volcanoes. Studying triggered earthquakes may provide insight into the stress state of faults, the faulting process, and magmatic responses. We explore dynamic triggering in documented regions of induced seismicity and in geothermal areas. Specifically, we document dynamic triggering and analyze the stress and attributes of triggering (wave type, orientation to local stress field, peak dynamic stress) in order to characterize dynamic triggering in these regions.


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