Multi-event simulations of slow slip events for a Cascadia-like subduction zone

Details Multi-event simulations of slow slip events for a Cascadia-like subduction zone Multi-event simulations of slow slip events for a Cascadia-like subduction zone

Aug 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3816312c&link_type=abstract

Geophysical Research Letters, Volume 38, Issue 16, CiteID L16312

Physics

Seismology: Earthquake Dynamics (1242), Seismology: Earthquake Interaction, Forecasting, And Prediction (1217, 1242, 4315), Tectonophysics: Subduction Zone Processes (1031, 3060, 3613, 8413)

Scientific paper

We employ the earthquake simulator, RSQSim, which incorporates rate- and state-dependent friction, to investigate characteristics of slow slip events (SSEs) along a Cascadia-like mega-thrust. The simulations consist of 100,000 SSEs with equivalent moment magnitudes Mw4.0-7.0. The largest simulated SSEs (Mw6.4-7.0) have inter-event times of ˜19 months, durations of 10-40 days, mean slips of 2.2-4.1 cm, and along-strike propagation speeds of 7-20 km/day, which are comparable to observations from Cascadia. The simulations show quiescence after Mw > 6.4 SSEs, followed by a progressive increase in both the magnitude and frequency of SSEs prior to the next large event. Small SSEs, below ˜Mw5.6, develop in an incoherent manner and have irregular geometries, while larger SSEs show highly coherent growth of the slip region and spontaneous, but transient, event-to-event segmentation. The change in event characteristics at ˜Mw5.6 corresponds to a break in the scaling of seismic moment with slip, fault area, and duration.

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