TY - JOUR
T1 - Fault slip distribution of the 2014 Iquique, Chile, earthquake estimated from ocean-wide tsunami waveforms and GPS data
AU - Gusman, Aditya Riadi
AU - Murotani, Satoko
AU - Satake, Kenji
AU - Heidarzadeh, Mohammad
AU - Gunawan, Endra
AU - Watada, Shingo
AU - Schurr, Bernd
N1 - Publisher Copyright:
©2015. American Geophysical Union. All Rights Reserved.
PY - 2015/2/28
Y1 - 2015/2/28
N2 - 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 traveltime 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 coseismic crustal deformation. The major slip region with a size of 100km×40km is located downdip the epicenter at depth ~28 km, regardless of assumed rupture velocities. The total seismic moment estimated from the slip distribution is 1.24×1021Nm (Mw 8.0).
AB - 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 traveltime 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 coseismic crustal deformation. The major slip region with a size of 100km×40km is located downdip the epicenter at depth ~28 km, regardless of assumed rupture velocities. The total seismic moment estimated from the slip distribution is 1.24×1021Nm (Mw 8.0).
KW - Chile earthquakes
KW - earthquake rupture process
KW - far-field tsunami waveforms
KW - joint inversion
KW - the 2014 Iquique earthquake
KW - tsunami delay correction
UR - http://www.scopus.com/inward/record.url?scp=84924902409&partnerID=8YFLogxK
U2 - 10.1002/2014GL062604
DO - 10.1002/2014GL062604
M3 - Article
AN - SCOPUS:84924902409
SN - 0094-8276
VL - 42
SP - 1053
EP - 1060
JO - Geophysical Research Letters
JF - Geophysical Research Letters
IS - 4
ER -