Faulting Mechanism of Tarutung Earthquake 2022 Mw 5.8 Using Moment Tensor Inversion
Abstract
On October 1, 2022, an earthquake with a magnitude of 5.8 shook the Tarutung area which was generated by an active fault at a shallow depth of 10 km. In this study, relocating the hypocenter and determining the mechanism of the earthquake was carried out to understand the active tectonic structure. The distribution of hypocenter relocation figures a pull-apart pattern at shallow depths. The earthquake mechanism shows a dextral pattern in the Southwest – Southeast direction with a strike of 138º – 158º. The aftershocks are more dominantly distributed in the pull-apart system in the southeastern part and show the greater part of the transfer of seismic static stress to the southeastern side of the Toru fault. The pull-apart tectonic system scheme in the Tarutung basin with secondary faults as extensional faults is proposed to be a fault source model that forms a negative-flower structure geological pattern. The results of this study can be used as a reference for the Tarutung tectonic system and applied as a mitigation study.
Downloads
References
Aki, K., & Richards, P. G. (2002). Quantitative seismology.
Asnawi, Y., Simanjuntak, A., Muksin, U., Rizal, S., Syukri, M. S. M., Maisura, M., & Rahmati, R. (2022). Analysis of Microtremor H/V Spectral Ratio and Public Perception for Disaster Mitigation. GEOMATE Journal, 23(97), 123-130.
Bellier, O., Sebrier, M., Pramumijoyo, S., Beaudouin, T., Harjono, H., Bahar, I., & Forni, D. O. (1997). Paleoseismicity and seismic hazard along the Great Sumatran Fault (Indonesia). Journal of Geodynamics, 24(1-4), 169-183.
Bradley, K. E., Feng, L., Hill, E. M., Natawidjaja, D. H., & Sieh, K. (2017). Implications of the diffuse deformation of the Indian Ocean lithosphere for slip partitioning of oblique plate convergence in Sumatra. Journal of Geophysical Research: Solid Earth, 122(1), 572-591.
Gahalaut, V. K., Nagarajan, B., Catherine, J. K., & Kumar, S. (2006). Constraints on 2004 Sumatra–Andaman earthquake rupture from GPS measurements in Andaman–Nicobar Islands. Earth and Planetary Science Letters, 242(3-4), 365-374.
Heimann, S., Isken, M., Kühn, D., Sudhaus, H., Steinberg, A., Daout, S., ... & Dahm, T. (2018). Grond: A probabilistic earthquake source inversion framework.
Hurukawa, N., Wulandari, B. R., & Kasahara, M. (2014). Earthquake history of the Sumatran fault, Indonesia, since 1892, derived from relocation of large earthquakes. Bulletin of the Seismological Society of America, 104(4), 1750-1762.
Irwandi, I., Muksin, U., & Simanjuntak, A. V. (2021). Probabilistic seismic hazard map analysis for Aceh Tenggara district and microzonation for Kutacane city. In IOP Conference Series: Earth and Environmental Science (Vol. 630, No. 1, p. 012001). IOP Publishing.
McCaffrey, R. (2009). The tectonic framework of the Sumatran subduction zone. Annual Review of Earth and Planetary Sciences, 37, 345-366.
Muksin, U., Arifullah, A., Simanjuntak, A. V., Asra, N., Muzli, M., Wei, S., ... & Okubo, M. (2023). Secondary fault system in Northern Sumatra, evidenced by recent seismicity and geomorphic structure. Journal of Asian Earth Sciences, 105557.
Muksin, U., Bauer, K., & Haberland, C. (2013). Seismic Vp and Vp/Vs structure of the geothermal area around Tarutung (North Sumatra, Indonesia) derived from local earthquake tomography. Journal of volcanology and geothermal research, 260, 27-42.
Muksin, U., Haberland, C., Nukman, M., Bauer, K., & Weber, M. (2014). Detailed fault structure of the Tarutung Pull-Apart Basin in Sumatra, Indonesia, derived from local earthquake data. Journal of Asian Earth Sciences, 96, 123-131.
Nurana, I., Simanjuntak, A. V. H., Umar, M., Kuncoro, D. C., Syamsidik, S., & Asnawi, Y. (2021). Spatial Temporal Condition of Recent Seismicity In The Northern Part of Sumatra. Elkawnie: Journal of Islamic Science and Technology, 7(1), 131-145.
Pasari, S., Simanjuntak, A. V., Mehta, A., Neha, & Sharma, Y. (2021). A synoptic view of the natural time distribution and contemporary earthquake hazards in Sumatra, Indonesia. Natural Hazards, 108, 309-321.
Pasari, S., Simanjuntak, A. V., Mehta, A., Neha, & Sharma, Y. (2021). The current state of earthquake potential on Java Island, Indonesia. Pure and Applied Geophysics, 178, 2789-2806.
Pasari, S., Simanjuntak, A. V., Neha, & Sharma, Y. (2021). Nowcasting earthquakes in Sulawesi island, Indonesia. Geoscience Letters, 8, 1-13.
Sieh, K., & Natawidjaja, D. (2000). Neotectonics of the Sumatran fault, Indonesia. Journal of Geophysical Research: Solid Earth, 105(B12), 28295-28326.
Simanjuntak, A. V., & Ansari, K. (2022). Seismicity clustering of sequence phenomena in the active tectonic system of backthrust Lombok preceding the sequence 2018 earthquakes. Arabian Journal of Geosciences, 15(23), 1730.
Simanjuntak, A. V., Kuncoro, D. C., Irwandi, I., & Muksin, U. (2022). Understanding swarm earthquakes in Southeast Aceh, Sumatra. In E3S Web of Conferences (Vol. 339, p. 02011). EDP Sciences.
Simanjuntak, A., Muksin, U., Asnawi, Y., Rizal, S., & Wei, S. (2022). Recent Seismicity and Slab Gap Beneath Toba Caldera (Sumatra) Revealed Using Hypocenter Relocation Methodology. Geomate Journal, 23(99), 82-89.
Waldhauser, F. (2001). HYPODD--A program to compute double-difference hypocenter locations, U.S. Geologic Survey Open-File Report.
Waldhauser, F. and W.L. Ellsworth (2000). A double-difference earthquake location algorithm: Method and application to the Hayward fault, Bulletin of the Seismological Society of America 90, 1353-1368.
Copyright (c) 2023 Journal of Applied Geospatial Information
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
Copyright @2023. This is an open-access article distributed under the terms of the Creative Commons Attribution-ShareAlike 4.0 International License which permits unrestricted use, distribution, and reproduction in any medium. Copyrights of all materials published in JAGI are freely available without charge to users or / institution. Users are allowed to read, download, copy, distribute, search, or link to full-text articles in this journal without asking by giving appropriate credit, provide a link to the license, and indicate if changes were made. All of the remix, transform, or build upon the material must distribute the contributions under the same license as the original.
