Observations of tremor using newly available seismic datasets in Cascadia

Robert Porritt and Richard M. Allen
University of California Berkeley

AGU Fall Meeting, San Francisco, December 2007.

Observations of episodic tremor and slip have now been made along the length of Cascadia. Until recently the seismic data available to study tremor has been limited, particularly in Oregon. However, continuous data from the NC network in northern California was recently made available at the NCEDC, Earthscope Transportable Array stations were deployed along the length of Cascadia, and this summer two Earthscope Flexible Arrays have been deployed in the region. The Mendocino Experiment (collaborative between UC Berkeley, University of Oregon, and Rice University) is a dense clustering of 80 broadband seismometers in northern California adjacent to the Mendocino Triple Junction for 1 year to gather continuous data to better image the crust and upper mantle in the region. The Flexarray Along Cascadia Experiment for Segmentation (FACES: collaborative between UC Berkeley and Miami University of Ohio) aims to provide data to expand on observations of segmentation in ETS characteristics along the Cascadia Subduction Zone. The deployment employs 23 broadband seismometers from southern Oregon to northern Washington. Using these datasets we examine the characteristics of tremor throughout the region.

© Richard M Allen