E3S Web Conf.
Volume 339, 2022The 10th International Conference on Multidisciplinary Research (ICMR) in conjunction with The 2nd International and National Symposium on Aquatic Environment and Fisheries (INSAEF) 2021
|Number of page(s)||4|
|Section||Recent Advancement in Technologies of Marine Explorations and Earth System|
|Published online||24 January 2022|
Understanding swarm earthquakes in Southeast Aceh, Sumatra
1 Badan Meteorologi Klimatologi dan Geofisika (BMKG), 22123 Aceh Besar, Aceh, Indonesia
2 Department of Physics of Universitas Syiah Kuala (USK), 22122 Banda Aceh, Aceh, Indonesia
3 Tsunami Disaster and Mitigation Hazard Center (TDMRC), Universitas Syiah Kuala (USK), 22122 Banda Aceh, Aceh, Indonesia
* Corresponding author:
The cause of the swarm earthquakes occurring from September until November 2020 remains unclear. The swarm activities are close to the Tripa active fault but also close to Mt. Bendahara. This study offers the analysis of seismic P and S wave arrivals and relocate the hypocenter of the swarm. We analysed the hypocentre distribution that recorded by Badan Meteorologi Klimatologi dan Geofisika (BMKG) from July 2020 to January 2021. The arrival of P and S-wave from 103 events was used obtain 1-D seismic velocity model. The earthquake used for this study consisted of at least 6 phases of seismic arrivals with the azimuthal gap angle less than 180 degree. The different velocities occurred in the upper and lower of the crustal thickness of 0 – 40 km. The Vp values are about 5.0 – 7.0 km/s and 3.0 – 5.0 km/s for Vs value while the Vp/Vs ratio are ranging from 1.5 to 1.7. Our preliminary results indicate that the potential swarm activities near to Mt. Bandahara maybe triggered by an unknown fault activity as no volcanic activity was reported.
© The Authors, published by EDP Sciences, 2022
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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