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    Hypocenter relocation of the aftershocks of the Mw 7.5 Palu earthquake (September 28, 2018) and swarm earthquakes of Mamasa, Sulawesi, Indonesia, using the BMKG network data

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    Type
    Dataset
    Authors
    Supendi, Pepen
    Nugraha, Andri Dian
    Widiyantoro, Sri
    Abdullah, Chalid Idham
    Puspito, Nanang T.
    Palgunadi, Kadek Hendrawan
    Daryono, D.
    Wiyono, Samsul Hadi
    KAUST Department
    Physical Science and Engineering (PSE) Division
    Physical Science and Engineering, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
    Date
    2019
    Permanent link to this record
    http://hdl.handle.net/10754/664960
    
    Metadata
    Show full item record
    Abstract
    Abstract On September 28, 2018, the Mw 7.5 earthquake occurred in Palu, Central Sulawesi, Indonesia. This earthquake produced strong tremors, landslides, liquefaction and a tsunami and caused thousands of fatalities and damaged houses and infrastructure. We have relocated 386 of the 554 Palu aftershocks by using the double-difference relocation method (hypoDD) from September 28 to November 22, 2018. The aftershock pattern is consistent with the crustal deformation in the area and generally shows that the events have a NW–SE trending of ~ 200 km in length and ~ 50 km in width. Most of the aftershocks are located to the east of the Palu-Koro Fault Line. Since November 2, 2018, there have been hundreds of swarm earthquakes in the area of Mamasa, West Sulawesi, which is about 230 km south of the city of Palu. Some of these earthquakes were felt, and houses were even damaged. We have relocated 535 of the 556 swarm earthquakes having a magnitude of M 2 to M 5.4. Our results show that the seismicity pattern has a dip that becomes shallower to the west (dipping at a ~ 45° angle) and extends from north to south for a length of ~ 50 km. We also conducted a focal mechanism analysis to estimate the type of fault slip for selected events of an M > 4.5 magnitude. Most of the solutions of the focal mechanism analysis show a normal fault type. This swarm earthquake probably corresponds to the activity of the fault in the local area.
    Citation
    Pepen Supendi, Nugraha, A., Widiyantoro, S., Chalid Abdullah, Nanang Puspito, Kadek Palgunadi, D. Daryono, & Samsul Wiyono. (2019). Hypocenter relocation of the aftershocks of the Mw 7.5 Palu earthquake (September 28, 2018) and swarm earthquakes of Mamasa, Sulawesi, Indonesia, using the BMKG network data. figshare. https://doi.org/10.6084/M9.FIGSHARE.C.4784517.V1
    Publisher
    figshare
    DOI
    10.6084/m9.figshare.c.4784517.v1
    Relations
    Is Supplement To:
    • [Article]
      Supendi, P., Nugraha, A. D., Widiyantoro, S., Abdullah, C. I., Puspito, N. T., Palgunadi, K. H., … Wiyono, S. H. (2019). Hypocenter relocation of the aftershocks of the Mw 7.5 Palu earthquake (September 28, 2018) and swarm earthquakes of Mamasa, Sulawesi, Indonesia, using the BMKG network data. Geoscience Letters, 6(1). doi:10.1186/s40562-019-0148-9. DOI: 10.1186/s40562-019-0148-9 HANDLE: 10754/660977
    ae974a485f413a2113503eed53cd6c53
    10.6084/m9.figshare.c.4784517.v1
    Scopus Count
    Collections
    Physical Science and Engineering (PSE) Division; Datasets

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