Rapid modeling of the 2011 Mw 9.0 Tohoku-oki earthquake with seismogeodesy

Citation:
Melgar, D, Crowell BW, Bock Y, Haase JS.  2013.  Rapid modeling of the 2011 Mw 9.0 Tohoku-oki earthquake with seismogeodesy. Geophysical Research Letters.

Keywords:

1242 Seismic cycle related deformations, 4302 Geological, 4341 Early warning systems, 7215 Earthquake source observations, 7290 Computational seismology, CMT, rapid response, real time GPS, seismogeodesy, source model, tohoku-oki earthquake

Abstract:

Rapid characterization of finite fault geometry and slip for large earthquakes is important for mitigation of seismic and tsunamigenic hazards. Saturation of near-source weak motion and problematic integration of strong-motion data into displacements make this difficult in real time. Combining GPS and accelerometer data to estimate seismogeodetic displacement waveforms overcomes these limitations by providing mm-level three-dimensional accuracy and improved estimation of coseismic deformation compared to GPS-only methods. We leverage collocated GPS and accelerometer data from the 2011 Mw 9.0 Tohoku-oki, Japan earthquake by replaying them in simulated real-time mode. Using a novel approach to account for fault finiteness, we generate an accurate centroid moment tensor solution independently of any constraint on the slab geometry followed by a finite fault slip model. The replay of GPS and seismic data demonstrates that robust models could have been made available within 3 min of earthquake initiation.

Notes:

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Website

DOI:

10.1002/grl.50590