Fault slip distribution of the 2014 Iquique, Chile, earthquake estimated from ocean-wide tsunami waveforms and GPS data

Aditya Riadi Gusman, Satoko Murotani, Kenji Satake, Mohammad Heidarzadeh, Endra Gunawan, Shingo Watada, Bernd Schurr

Research output: Contribution to journalArticlepeer-review

122 Citations (SciVal)

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 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).

Original languageEnglish
Pages (from-to)1053-1060
Number of pages8
JournalGeophysical Research Letters
Volume42
Issue number4
DOIs
Publication statusPublished - 28 Feb 2015

Bibliographical note

Publisher Copyright:
©2015. American Geophysical Union. All Rights Reserved.

Keywords

  • Chile earthquakes
  • earthquake rupture process
  • far-field tsunami waveforms
  • joint inversion
  • the 2014 Iquique earthquake
  • tsunami delay correction

ASJC Scopus subject areas

  • Geophysics
  • General Earth and Planetary Sciences

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