Source model of the 16 September 2015 Illapel, Chile, Mw 8.4 earthquake based on teleseismic and tsunami data

Mohammad Heidarzadeh, Satoko Murotani, Kenji Satake, Takeo Ishibe, Aditya Riadi Gusman

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107 Citations (SciVal)

Abstract

We proposed a source model for the 16 September 2015 Illapel (Chile) tsunamigenic earthquake using teleseismic and tsunami data. The 2015 epicenter was at the northernmost of the aftershocks zone of the 2010 Mw 8.8 Maule earthquake. Teleseismic body wave inversions and tsunami simulations showed optimum rupture velocities of 1.5-2.0 km/s. The agreement between observed and synthetic waveforms was quantified using normalized root-mean-square (NRMS) misfit. The variations of NRMS misfits were larger for tsunami data compared to the teleseismic data, because tsunami waveforms are more sensitive to the spatial distribution of slip. The large-slip area was 80 km (along strike) × 100 km (along dip) with an average slip of 5.0 m and depth of 12-33 km, located ~70 km to the northwest of the epicenter. We obtained a seismic moment of 4.42 × 1021 Nm equivalent to Mw 8.4. Results may indicate a northward stress transfer from the 2010 Maule earthquake.

Original languageEnglish
Pages (from-to)643-650
Number of pages8
JournalGeophysical Research Letters
Volume43
Issue number2
DOIs
Publication statusPublished - 28 Jan 2016

Bibliographical note

Publisher Copyright:
© 2016. American Geophysical Union. All Rights Reserved.

Keywords

  • Chilean subduction zone
  • earthquake
  • Illapel earthquake of 16 September 2015
  • teleseismic body wave inversion
  • tsunami
  • tsunami modeling

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

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