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

Supendi P., Ramdhan M., Priyobudi, Sianipar D., Wibowo A., Gunawan M.T., Rohadi S., Riama N.F., Daryono, Prayitno B.S., Murjaya J., Karnawati D., Meilano I., Rawlinson N., Widiyantoro S., Nugraha A.D., Marliyani G.I., Palgunadi K.H., Elsera E.M.

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


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. [Figure not available: see fulltext.]. © 2021, The Author(s).

Earthquake; Mamuju–Majene; Relocation; Rupture; Stress-change


Earth, Planets and Space

Publisher: Springer Science and Business Media Deutschland GmbH

Volume 73, Issue 1, Art No 106, Page – , Page Count

Journal Link:

doi: 10.1186/s40623-021-01436-x

Issn: 13438832

Type: All Open Access, Gold, Green


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