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Title: Fault slip distribution of the 2014 Iquique, Chile, earthquake estimated from ocean-wide tsunami waveforms and GPS data
Authors: Gusman, AR
Murotani, S
Satake, K
Heidarzadeh, M
Gunawan, E
Watada, S
Schurr, B
Keywords: Science & Technology;Physical Sciences;Geosciences, Multidisciplinary;Geology;TOHOKU EARTHQUAKE;COSEISMIC SLIP;DEFORMATION;SIMULATION;SPACE;TIME
Issue Date: 2015
Citation: GEOPHYSICAL RESEARCH LETTERS, 2015, 42 (4), pp. 1053 - 1060 (8)
Abstract: We applied a new method to compute tsunami Green’s functions for slip inversion of the 1 April 2014 Iquique earthquake using both near-field and far-field tsunami waveforms. Inclusion of the effects of the elastic loading of seafloor, compressibility of seawater, and the geopotential variation in the computed Green’s functions reproduced the tsunami travel-time delay relative to long-wave simulation, and allowed us to use far-field records in tsunami waveform inversion. Multiple time window inversion was applied to tsunami waveforms iteratively until the result resembles the stable moment-rate function from teleseismic inversion. We also used GPS data for a joint inversion of tsunami waveforms and co-seismic crustal deformation. The major slip region with a size of 100 km × 40 km is located down-dip the epicenter at depth ~28 km, regardless of assumed rupture velocities. The total seismic moment estimated from the slip distribution is 1.24 × 1021 Nm (Mw 8.0).
Appears in Collections:Dept of Life Sciences Research Papers

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