Foreshock–mainshock–aftershock sequence analysis of the 14 January 2021 (Mw 6.2) Mamuju–Majene (West Sulawesi, Indonesia) earthquake

Earth, Planets and Space

Nelly Florida Riama¹  Supriyanto Rohadi¹  Dimas Sianipar¹  Bambang Setiyo Prayitno¹  Adhi Wibowo¹  Mohamad Ramdhan¹  Dwikorita Karnawati¹  Pepen Supendi¹  Mohamad Taufik Gunawan¹  Jaya Murjaya¹  Emelda Meva Elsera²  Nicholas Rawlinson³  Irwan Meilano⁴  Gayatri Indah Marliyani⁵  Andri Dian Nugraha⁶  Sri Widiyantoro⁷  Kadek Hendrawan Palgunadi⁸ 

[1] Agency for Meteorology, Climatology, and Geophysics, 10720, Jakarta, Indonesia;Agency for Meteorology, Climatology, and Geophysics, 90231, Makasar, Indonesia;Department of Earth Sciences-Bullard Labs, University of Cambridge, CB30EZ, Cambridge, UK;Faculty of Earth Science and Technology, Institute of Technology Bandung (ITB), Bandung, Indonesia;Geological Engineering Department, Gadjah Mada University, 55281, Yogyakarta, Indonesia;Global Geophysics Research Group, Faculty of Mining and Petroleum Engineering, Institut Teknologi Bandung, 40132, Bandung, Indonesia;Global Geophysics Research Group, Faculty of Mining and Petroleum Engineering, Institut Teknologi Bandung, 40132, Bandung, Indonesia;Faculty of Engineering, Maranatha Christian University, 40164, Bandung, Indonesia;Physical Science and Engineering, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia;

关键词: Mamuju–Majene;    Earthquake;    Relocation;    Rupture;    Stress-change;   

DOI  :  10.1186/s40623-021-01436-x

来源: Springer

【 摘 要 】

We present here an analysis of the destructive Mw 6.2 earthquake sequence that took place on 14 January 2021 in Mamuju–Majene, West Sulawesi, Indonesia. Our relocated foreshocks, mainshock, and aftershocks and their focal mechanisms show that they occurred on two different fault planes, in which the foreshock perturbed the stress state of a nearby fault segment, causing the fault plane to subsequently rupture. The mainshock had relatively few aftershocks, an observation that is likely related to the kinematics of the fault rupture, which is relatively small in size and of short duration, thus indicating a high stress-drop earthquake rupture. The Coulomb stress change shows that areas to the northwest and southeast of the mainshock have increased stress, consistent with the observation that most aftershocks are in the northwest.

【 授权许可】

CC BY