Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 40, Issue 12, Pages 2963-2968Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/grl.50590
Keywords
seismogeodesy; source model; Tohoku-oki earthquake; real time GPS; CMT; rapid response
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Funding
- NASA [NNX09AI67G, NNX12AK24G, NNX12AN55H]
- SCEC [12083]
- NASA [43463, NNX12AK24G, 117396, NNX09AI67G, 69781, NNX12AN55H] Funding Source: Federal RePORTER
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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.
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