Stuck in the mud? Earthquake nucleation and propagation through accretionary forearcs

Details Stuck in the mud? Earthquake nucleation and propagation through accretionary forearcs Stuck in the mud? Earthquake nucleation and propagation through accretionary forearcs

Sep 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3818303f&link_type=abstract

Geophysical Research Letters, Volume 38, Issue 18, CiteID L18303

Physics

2

Mineralogy And Petrology: Subduction Zone Processes (1031, 3060, 8170, 8413), Seismology: Earthquake Dynamics (1242), Structural Geology: Fractures And Faults, Tectonophysics: Dynamics And Mechanics Of Faulting (8004)

Scientific paper

Subduction zone earthquakes can propagate to the surface causing large seafloor displacements resulting in tsunamis. This requires the earthquake to rupture through clay-rich sediments of the accretionary wedge, which are largely aseismic. As found previously, the frictional properties of a range of wet clays at low slip velocity are velocity strengthening, thus inhibiting earthquake nucleation. However, at high slip velocity the same materials weaken almost immediately resulting in a negligible critical slip weakening distance and fracture energy. We interpret this behaviour as rapid thermal pressurization of the pore fluid within the clay gouge. The lack of fracture energy can explain how a large rupture, propagating from depth, might not be arrested by clay-rich, velocity-strengthening sediments, as is commonly seen. The results suggest that generally, earthquakes may be difficult to nucleate on mature faults dominated by clay, but the propagation of earthquakes through these zones is energetically very favourable.

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