Analysis of the 2021 Semangko Bay Earthquake Sequence in Southern Sumatra, Indonesia, Using Broadband Seismic Network Data

Pepen Supendi; Sri Widiyantoro; Nicholas RawlinsonAdhi WibowoPriyobudi PriyobudiKadek Hendrawan PalgunadiAndri Dian NugrahaIswandi ImranGayatri Indah MarliyaniDaryono DaryonoBambang Setiyo PrayitnoMuhammad SadlyDwikorita KarnawatiNovita SariAnton Sugiharto

首页> 外文期刊>Seismological research letters >Analysis of the 2021 Semangko Bay Earthquake Sequence in Southern Sumatra, Indonesia, Using Broadband Seismic Network Data

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Analysis of the 2021 Semangko Bay Earthquake Sequence in Southern Sumatra, Indonesia, Using Broadband Seismic Network Data

机译：Analysis of the 2021 Semangko Bay Earthquake Sequence in Southern Sumatra, Indonesia, Using Broadband Seismic Network Data

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Beginning on 30 June 2021, hundreds of earthquakes were detected beneath Semangko Bay in southernmost Sumatra, which is located adjacent to the Sunda Strait, a narrow sea passage that separates the islands of Java and Sumatra. A number of these earthquakes were large enough to be felt by people living in the city of Lampung, some 100 km to the east. In terms of magnitude and temporal distribution, the earthquakes did not follow a typical mainshock–aftershock sequence because the onset was marked by a cluster of five earthquakes with local magnitudes that ranged between 4.2 and 4.6, followed by a rapid decay in the number of detected events. We have relocated 254 of the 258 earthquakes that were recorded between 30 June and 14 July 2021, with a local magnitude range between ML 0.9 and 4.6, using the double‐difference relocation method (hypoDD); focal mechanisms were also determined for a subset of events with a magnitude >4. Our results show that the seismicity pattern and focal mechanism solutions are more consistent with a multiple event episode caused by the rupture of several antithetic faults that have a similar strike to the west Semangko fault in southernmost Sumatra rather than a single fault plane. These faults appear to be part of a small graben system located beneath Semangko Bay, which was likely activated by ongoing extension in the Sunda Strait.

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《Seismological research letters》 |2022年第3期|1373-1381|共9页
作者
Pepen Supendi; Sri Widiyantoro; Nicholas RawlinsonAdhi WibowoPriyobudi PriyobudiKadek Hendrawan PalgunadiAndri Dian NugrahaIswandi ImranGayatri Indah MarliyaniDaryono DaryonoBambang Setiyo PrayitnoMuhammad SadlyDwikorita KarnawatiNovita SariAnton Sugiharto;
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Agency for Meteorology, Climatology, and Geophysics;

Physical Science and Engineering, King Abdullah University of Science and Technology, Thuwal;

Global Geophysics Research Group, Faculty of Mining and Petroleum Engineering, Institut Teknologi BandungStructural Engineering Research Group, Faculty of Civil and Environmental Engineering, Institut Teknologi BandungDepartment of Earth Sciences—Bullard Labs, University of CambridgeGeological Engineering Department, Gadjah Mada University;

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中图分类地震学;
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Analysis of the 2021 Semangko Bay Earthquake Sequence in Southern Sumatra, Indonesia, Using Broadband Seismic Network Data

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