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  Source analysis and seismotectonic context of the 2021 MW 5.8 and MW 6.2 Tojo Una-Una earthquake in Sulawesi (Indonesia)

Daniarsyad, G., Sianipar, D., Serhalawan, Y., Arimuko, A., Ulfiana, E., Daryono, D., Pranata, B., Adi, S. P., Karnawati, D. (2023): Source analysis and seismotectonic context of the 2021 MW 5.8 and MW 6.2 Tojo Una-Una earthquake in Sulawesi (Indonesia), XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-3845

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Item Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5020700 Version Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5020700_2
Genre: Conference Paper

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 Creators:
Daniarsyad, Gatut1, Author
Sianipar, Dimas1, Author
Serhalawan, Yopi1, Author
Arimuko, Abraham1, Author
Ulfiana, Emi1, Author
Daryono, Daryono1, Author
Pranata, Bayu1, Author
Adi, Suko Prayitno1, Author
Karnawati, Dwikorita1, Author
Affiliations:
1IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations, ou_5011304              

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 Abstract: On 26 July 2021, two significant earthquakes took place beneath the Gulf of Tomini, Sulawesi, Indonesia. The first earthquake, an MW 5.8, was followed by an MW 6.3 earthquake and caused light damages in the nearby town. The origin of these earthquakes was unclear, and their relations to regional seismotectonic were not well understood. In this study, we analyze the source characteristics of these earthquakes by using seismograms came from regional and global seismic stations. We obtain the double-couple focal mechanisms for four selected events using regional waveform inversion and indicate normal-faulting mechanisms for all earthquakes with centroid depths in the middle crust (depth of about ~10-13 km). We contribute the possible finite-fault rupture of the MW 6.3 event by using a teleseismic inversion. This event has only one single asperity with a peak slip of about 146 cm and a high stress drop of about 80 bars. The average slip in this asperity is approximately 87 cm, and the rupture duration is about 7–s. Our hypocenter relocation procedure favors the northeast-dipping plane (strike 290°, dip 48°) as a possible active fault ruptured during the earthquakes. We propose that the 2021 Tojo Una-Una earthquakes correspond to a possible active normal fault that has not been identified previously in the earthquake hazard map. This normal fault could be related to extensional tectonics beneath the Gulf of Tomini.

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Language(s): eng - English
 Dates: 2023-07-112023-07-11
 Publication Status: Finally published
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 Identifiers: DOI: 10.57757/IUGG23-3845
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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Place of Event: Berlin
Start-/End Date: 2023-07-11 - 2023-07-20

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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Source Genre: Proceedings
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Publ. Info: Potsdam : GFZ German Research Centre for Geosciences
Pages: - Volume / Issue: - Sequence Number: - Start / End Page: - Identifier: -