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Episodic Tremor and Slip along the length of Cascadia Observations and implications for seismic hazard
 

Summary: Episodic Tremor and Slip along the length of Cascadia
Observations and implications for seismic hazard
Richard Allen* UC Berkeley
Michael Brudzinski Miami University
Presentation to National Earthquake Predication Evaluation Council, May 18th 2007.
Segmentation of ETS characteristics and events
Three zones with similar recurrence intervals: 14 2 months in the north, 19 4 months
in the central region and 10 2 months in the south.
There are around seven segments which can host distinct ETS events.
From 2000 to 2006 there where 22 months during which an ETS event occurred, i.e. an
average of one event every 3.3 months.
Structural control of ETS
The three zones correlate with geologic terrain of the continental plate.
The seven segments correlate with forearc basins interpreted as indicators of megathrust
structure.
Implications for seismic hazard
The slow slip events likely increase stress on the megathrust.
The correlation between ETS segments and megathrust asperities is consistent with a
link between ETS and megathrust processes.
While this illustrates the importance of future research, public warnings every ~3

  

Source: Allen, Richard M. - Seismological Laboratory, Department of Earth and Planetary Science, University of California at Berkeley

 

Collections: Geosciences