A Silent Slip Event on the Deeper Cascadia Subduction Interface

Details A Silent Slip Event on the Deeper Cascadia Subduction Interface A Silent Slip Event on the Deeper Cascadia Subduction Interface

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001sci...292.1525d&link_type=abstract

Science, Volume 292, Issue 5521, pp. 1525-1528 (2001).

Physics

201

Scientific paper

Continuous Global Positioning System sites in southwestern British Columbia, Canada, and northwestern Washington state, USA, have been moving landward as a result of the locked state of the Cascadia subduction fault offshore. In the summer of 1999, a cluster of seven sites briefly reversed their direction of motion. No seismicity was associated with this event. The sudden displacements are best explained by ~2 centimeters of aseismic slip over a 50-kilometer-by-300-kilometer area on the subduction interface downdip from the seismogenic zone, a rupture equivalent to an earthquake of moment magnitude 6.7. This provides evidence that slip of the hotter, plastic part of the subduction interface, and hence stress loading of the megathrust earthquake zone, can occur in discrete pulses.

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