EGU22-8496, updated on 28 Mar 2022
https://doi.org/10.5194/egusphere-egu22-8496
EGU General Assembly 2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Characteristic of Source and Seismic Hazard Analysis of Majene Earthquake Mw 6.2, January 15, 2021

Retno Agung Prasetyo, Supriyanto Rohadi, Rahmat Setyo Yuliatmoko, Aditya Rahman, Yusuf Hadi Perdana, Nelly Florida Riama, Suko Prayitno Adi, Dwikorita Karnawati, and Bambang Setiyo Prayitno
Retno Agung Prasetyo et al.
  • Indonesia Agency for Meteorology Cliamtology and Geophysics, Jakarta, Indonesia (prasetyo.agung@bmkg.go.id)

A major earthquakes struck the Majene Regency, in West Sulawesi province, Indonesia, on 15 January 2021 at 02.28 local time, the hypocenter is 2.97°S, 118.99°E, depth 38.0 km, with moment magnitude Mw 6.2 with an epicenter located about 6 km Northeast Majene, West Sulawesi. This large event causing extensive damage, great economic loss and casualties in the Majene city and surrounding region. The mainshock preceded by significant foreshock on 14 January 2021 at 14.35 local time, 3°S, 118.94°E, depth 10.0 km Mw 5.9, epicenter was located at about 4 km Northwest of Majene. The faulting orientation of the mainshock, and foreshock was strike = 330°, dip = 17°, and slip = 59°, and strike = 353°, dip = 29°, and slip = 61°, respectively, is possibly related to Mamuju-Majene thrust fault. Focal mechanism solutions for the earthquakes indicate rupture occurred thrust fault with low dip angle. The mainshock was followed by low aftershocks productivity may due to homogeneous faulting systems and relatively uniform stress state in that region. We use hypocenter relocation, stress drop, coulomb stress and seismic hazard (PSHA) to investigate the earthquake characteristics and seismic hazard analysis. The distribution of hypocenter relocations indicate aftershock ruptured northern extension of the mainshock. This result supports that the highest of acceleration is the north component of the three component recorded acceleration, this detect the components of directivity toward the north for the foreshock distribution.

How to cite: Prasetyo, R. A., Rohadi, S., Yuliatmoko, R. S., Rahman, A., Perdana, Y. H., Riama, N. F., Adi, S. P., Karnawati, D., and Prayitno, B. S.: Characteristic of Source and Seismic Hazard Analysis of Majene Earthquake Mw 6.2, January 15, 2021, EGU General Assembly 2022, Vienna, Austria, 23–27 May 2022, EGU22-8496, https://doi.org/10.5194/egusphere-egu22-8496, 2022.

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