Source reconstruction of the 1969 Majene, Sulawesi earthquake and tsunami: A preliminary study

I. R. Pranantyo, A. Cipta, H. A. Shiddiqi, M. Heidarzadeh

Research output: Contribution to journalConference articlepeer-review

Abstract

We studied the February 23rd, 1969 M7.0 Majene, Sulawesi earthquake and tsunami. It was followed by tsunami reported at five locations. At least 64 people were killed and severe damage on infrastructures were reported in Majene region. Based on damage data, we estimated that the maximum intensity of the earthquake was MMI VIII. Focal mechanisms, derived using first motion polarity analysis, indicated that the earthquake had a thrust mechanism. Furthermore, we built hypothetical earthquake scenarios based on a rectangular fault plane of 40 km × 20 km with a homogeneous slip model of 1.5 m. We run the Open Quake and the JAGURS code to validate the macroseismic and tsunami observation data, respectively. Our best-fitted earthquake model generates maximum intensity of 8+ which is in line with the reported macroseismic data. However, the maximum simulated tsunami height from all scenario earthquakes is 2.25 m which is smaller than the 4 m tsunami height observed at Pelattoang. The possibility of contribution of another mechanism to tsunami generation requires further investigation.

Original languageEnglish
Article number012054
JournalIOP Conference Series: Earth and Environmental Science
Volume873
Issue number1
Early online date1 Nov 2021
DOIs
Publication statusPublished - 1 Nov 2021
Event3rd Southeast Asian Conference on Geophysics: Future Challenges and Opportunities in Geophysics, SEACG 2020 - Bandung, Virtual, Indonesia
Duration: 3 Nov 20205 Nov 2020

Bibliographical note

Funding Information:
This study is supported by the Royal Society, UK (grant number CHL\R1\180173)

Publisher Copyright:
© Published under licence by IOP Publishing Ltd.

Keywords

  • Earthquake
  • Eastern Indonesia
  • Numerical Simulations
  • Sulawesi
  • Tsunami

ASJC Scopus subject areas

  • General Environmental Science
  • General Earth and Planetary Sciences

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