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Characterizing an "uncharacteristic" ETS event in northern Cascadia

January 1, 2008

GPS and borehole strainmeter data allowed the detection and model characterization of a slow slip event in northern Cascadia in November 2006 accompanying a brief episode of seismic tremor. The event is much smaller in area and duration than other well-known ETS events in northern Cascadia but is strikingly similar to typical ETS events at the Nankai subduction zone. The 30-45 km depth range and the 2-3 cm slip magnitude as interpreted for this event appear to be common to most ETS events in these two subduction zones, regardless of their sizes. We infer that the Nankai-type small ETS events must be abundant at Cascadia and that ETS events at the two subduction zones are governed by a similar physical process.

Publication Year 2008
Title Characterizing an "uncharacteristic" ETS event in northern Cascadia
Authors Kelin Wang, Herb Dragert, Honn Kao, Evelyn Roeloffs
Publication Type Article
Publication Subtype Journal Article
Series Title Geophysical Research Letters
Index ID 70003379
Record Source USGS Publications Warehouse
USGS Organization Earthquake Science Center