2012 IRIS Workshop

Systematic Variability in LFE Recurrence Time Up and Down-dip

Justin R Sweet: University of Washington, Kenneth C Creager: University of Washington

We find a systematic variation in the recurrence time for low-frequency earthquakes (LFEs) located on the Cascadia subduction interface beneath the Olympic peninsula of Washington State. LFEs occur less frequently updip and more frequently downdip, in agreement with previously published results for tremor in this region (Wech and Creager, 2011). Note: the five Episodic Tremor and Slip (ETS) events that occurred during the time we analyzed are highlighted.

Full-resolution graphics file in original format: 0060.ai

The dataset analyzed for this figure comes from the Big Skidder (BS) CAFE array. Additional arrays and stations were used only for determining LFE locations. Tremor detections (also shown) rely on data from Pacific Northwest Seismic Network (PNSN) stations. Plate interface locations are from McCrory, 2006.

Acknoweldgements: This research was supported by funding from NSF under the Array of Arrays proposal. Additional support was provided by IRIS and EarthScope in the form of equipment and data storage.

Keywords: lfe, low_frequency_earthquake, tremor

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