Extent and duration of the 2003 Cascadia slow earthquake

Details Extent and duration of the 2003 Cascadia slow earthquake Extent and duration of the 2003 Cascadia slow earthquake

Feb 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3204301m&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 4, CiteID L04301

Physics

Geophysics

15

Geodesy And Gravity: Seismic Cycle Related Deformations (6924, 7209, 7223, 7230), Geodesy And Gravity: Transient Deformation (6924, 7230, 7240), Geodesy And Gravity: Satellite Geodesy: Results (6929, 7215, 7230, 7240), Marine Geology And Geophysics: Subduction Zone Processes (1031, 3613, 8170, 8413), Seismology: Earthquake Source Observations (1240)

Scientific paper

Inversion of continuous GPS measurements from the Pacific Northwest show the 2003 Cascadia slow earthquake to be among the largest of ten transients recognized here. Twelve stations bracketing slow slip indicate transient slip propagated bi-directionally from initiation in the southern Puget basin, reaching 300 km along-strike over a period of seven weeks. This event produced, for the first time, resolvable vertical subsidence, and horizontal displacement reaching six mm in southern Washington State. Inverted for non-negative thrust slip, a maximum of 3.8 cm of slip is inferred, centered at 28 km depth near the sharp arch in the subducting Juan de Fuca plate. Nearly all slip lies shallower than 38 km. Inverted slip shows a total moment release equal to Mw = 6.6 and a high degree of spatial localization rather than near-uniform slip. This suggests rupture concentrated along asperities holds for slow earthquakes as well as conventional events.

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