Tsunami Source Inversion Using Tide Gauge and DART Tsunami Waveforms of the 2017 Mw8.2 Mexico Earthquake

Bruno Adriano, Yushiro Fujii, Shunichi Koshimura, Erick Mas, Angel Ruiz-Angulo, Miguel Estrada

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

On September 8, 2017 (UTC), a normal-fault earthquake occurred 87 km off the southeast coast of Mexico. This earthquake generated a tsunami that was recorded at coastal tide gauge and offshore buoy stations. First, we conducted a numerical tsunami simulation using a single-fault model to understand the tsunami characteristics near the rupture area, focusing on the nearby tide gauge stations. Second, the tsunami source of this event was estimated from inversion of tsunami waveforms recorded at six coastal stations and three buoys located in the deep ocean. Using the aftershock distribution within 1 day following the main shock, the fault plane orientation had a northeast dip direction (strike = 320 , dip = 77 , and rake = - 92 ). The results of the tsunami waveform inversion revealed that the fault area was 240 km × 90 km in size with most of the largest slip occurring on the middle and deepest segments of the fault. The maximum slip was 6.03 m from a 30 × 30 km2 segment that was 64.82 km deep at the center of the fault area. The estimated slip distribution showed that the main asperity was at the center of the fault area. The second asperity with an average slip of 5.5 m was found on the northwest-most segments. The estimated slip distribution yielded a seismic moment of 2.9 × 10 21 Nm (Mw = 8.24), which was calculated assuming an average rigidity of 7 × 10 10 N/m2.

Original languageEnglish
Pages (from-to)35-48
Number of pages14
JournalPure and Applied Geophysics
Volume175
Issue number1
DOIs
Publication statusPublished - 2018 Jan 1

Keywords

  • 2017 Mw8.2 Mexico earthquake
  • tsunami numerical modeling
  • tsunami source inversion

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

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