Kinematic Afterslip Patterns

2023/08/03 by Brendan J. Meade, Meade, Brendan J.
Earth and Planetary Sciences · Computer Science · #earthquake and tectonic studies #Seismology and Earthquake Studies #Earthquake Detection and Analysis

paper · pdf · doi:10.48550/arxiv.2308.01510

Abstract

Non-inertial afterslip has been inferred to occur following large earthquakes. An explanation for this slow slip phenomenon is that coseismically generated stresses induce sliding on parts of a fault surface with velocity-strengthening frictional properties. Here we develop an alternative explanation for afterslip based on the idea that afterslip may occur on any portion of a fault that exhibits positive residual geometric moment following an earthquake, including sections that ruptured coseismically. Following a large earthquake, this model exhibits exponential time decay of afterslip and allows for variable sensitivity to coseismic event magnitude and residual geometric moment. This model provides a partial explanation for the spatial relationship of co- and post-seismic slip associated with the 2011 M_W=9 Tohoku-oki earthquake.

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