Fault size and depth extent of the Ecuador earthquake (Mw 7.8) of 16 April 2016 from teleseismic and tsunami data

Mohammad Heidarzadeh, Satoko Murotani, Kenji Satake, Tomohiro Takagawa, Tatsuhiko Saito

Research output: Contribution to journalArticlepeer-review

30 Citations (SciVal)

Abstract

The April 2016 Ecuador Mw 7.8 earthquake was the first megathrust tsunamigenic earthquake along the Ecuador-Colombia subduction zone since 1979 (Mw 8.2 with 200 deaths from tsunami). While there was no tsunami damage from the 2016 earthquake, small tsunamis were recorded at Deep-ocean Assessment and Reporting of Tsunami and tide gauges. Here we designed various fault models with and without shallow-slip area and compared the computed teleseismic and tsunami waveforms with the observations. While teleseismic inversions were indifferent about inclusion or exclusion of the shallow slip, tsunami waveforms strongly favored the slip model without shallow slip. Our final slip model has a depth range of 15–44 km, and its western shallowest limit is located at the distance of ~60 km from the trench. Maximum and average slips were 2.5 and 0.7 m, respectively. The large-slip area was 80 km (along strike) × 60 km (along dip) in the depth range of 15–35 km.

Original languageEnglish
Pages (from-to)2211-2219
Number of pages9
JournalGeophysical Research Letters
Volume44
Issue number5
DOIs
Publication statusPublished - 16 Mar 2017

Bibliographical note

Publisher Copyright:
©2017. American Geophysical Union. All Rights Reserved.

Keywords

  • earthquake
  • earthquake source
  • Ecuador earthquake 16 April 2016
  • subduction zone
  • teleseismic inversion
  • tsunami

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

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