Deformation under a Young Volcanic Covered Area in Southern Garut, Indonesia: Insight from 3D Gravity Modelling
DOI:
https://doi.org/10.5614/j.math.fund.sci.2024.55.3.3Keywords:
gravity, 3D inversion, active fault, southern Garut, IndonesiaAbstract
Destructive earthquakes are frequently related to inland active faults. In recent years, a significant number of shallow earthquakes with low magnitude have occurred in southern Garut, West Java, Indonesia. Two earthquakes, with magnitudes of M4.2 and M3.9 in 2016 and 2017, respectively, have caused significant damage and were interpreted as indications of an active fault. We used publicly available gravity data to infer the subsurface structure that may be related to recent seismic activity. We used spectral analysis and filtering techniques for the regional-residual anomaly separation and anomaly enhancement to show the basin structure in the study area. 3D gravity inversion modelling was performed to obtain the subsurface density distribution. The result indicates the sedimentary layers with a density of 2.4 to 2.5 gr/cm3 with an underlying basement with a density of 2.65 gr/cm3. An intra-basin basement high with an NE-SW trend divides the basin into two sub-basins. This local basement high can be associated with a magmatic intrusion body and a series of young volcanic bodies located at the northeastern end of the basin. Our results emphasize a possible strong interaction between the tectonic and magmatic activities in this region.
References
Lay, T., The Surge of Great Earthquakes from 2004 to 2014, Earth Planet. Sci. Lett., 409, pp. 133-146, 2015. doi: 10.1016/j.epsl.2014.10.047.
Tsuji, T., Yamamoto, K., Yamada, Y., Onishi, K., Bahar, A., Meilano, I. & Abidin, H.Z., Earthquake Fault of the 26 May 2006 Yogyakarta Earthquake Observed by SAR Interferometry, Earth Planets and Space, 61, pp. 29-32, 2009. doi: 10.1186/BF03353189.
Hayes, G.P., Briggs, R.W., Sladen, A., Fielding, E.J., Prentice, C., Hudnut, K., Mann, P., Taylor, F.W., Crone, A.J., Gold, R., Ito, T. & Simons, M., Complex Rupture During the 12 January 2010 Haiti Earthquake, Nature Geosci., 3(11), pp. 800-805, 2010. doi: 10.1038/ngeo977.
Natawidjaja, D.H., Daryono, D., Prasetya, G., Udrekh, Liu, P.L.F., Hananto, N.D., Kongko, W., Triyoso, W., Puji, A.R., Meilano, I., Gunawan, E., Supendi, P., Pamumpuni, A., Irsyam, M., Faizal, L., Hidayati, S., Sapiie, B., Kusuma, M.A. & Tawil, S., The 2018 Mw7.5 Palu ?Supershear? Earthquake Ruptures Geological Fault?s Multisegment Separated by Large Bends: Results from Integrating Field Measurements, LiDAR, Swath Bathymetry and Seismic-reflection Data, Geophys. J. Inter., 224(2), pp. 985-1002, 2021. doi: 10.1093/gji/ggaa498.
Abidin, H.Z., Andreas, H., Kato, T., Ito, T., Meilano, I., Kimata, F., Natawidjaja, D.H. & Harjono, H., Crustal Deformation Studies in Java (Indonesia) Using GPS, J. of Earthquake and Tsunami, 3(02), pp. 77-88, 2009. doi: 10.1142/S1793431109000445.
Supendi, P., Nugraha, A.D., Puspito, N.T., Widiyantoro, S. & Daryono, D., Identification of Active Faults in West Java, Indonesia, Based on Earthquake Hypocenter Determination, Relocation, and Focal Mechanism Analysis, Geosci. Lett., 5(31), pp. 1-10, 2018. doi: 10.1186/s40562-018-0130-y.
Supendi, P., Nugraha, A.D. & Widiyantoro, S., Recent Destructive Earthquakes Around Garut Area, West Java, Indonesia: An Unidentified Fault?, AIP Conf. Proc., 1987(1), 020077, 2018. doi: 10.1063/1.5047362.
Irsyam, M., Widiyantoro, S., Natawidjaja, D.H., Meilano, I., Rudyanto, A., Hidayati, S., Triyoso, W., Hanifa, N.R., Djarwadi, D., Faizal, L. & Sunarjito, Map of Indonesia?s Earthquake Sources and Hazards 2017, Center for Housing and Settlements Research and Development, Ministry of Public Works and Public Housing, 2017.
Alzwar, M., Bachri, S. & Akbar, N., Geological Map of The Garut and Pameungpeuk Quadrangle, Java, Scale 1:100.000, Bandung, 1992.
Koesmono, M., Kusnama & Suwarna, N., Geological Map of The Sindangbarang and Bandarwaru Quadrangle, Java, Scale 1:100.000, 2nd ed, Bandung, 1996.
Bogie, I., Indra, Y. & Wisnandary, M.C., Overview of the Wayang Windu Geothermal Field, West Java, Indonesia, Geothermics, 37(3), pp. 347-365, 2008. doi: 10.1016/j.geothermics.2008.03.004.
Intani, R.G., Golla, G.U., Syaffitri, Y., Paramitasari, H.M., Nordquist, G. A., Nelson, C., Ginanjar, Giri, G.K.D.S. & Sugandhi, A., Improving the Conceptual Understanding of the Darajat Geothermal Field, Geothermics, 83, 101716, 2020. doi: 10.1016/j.geothermics.2019.101716.
Kamah, M.Y., Armando, A., Rahmani, D.L. & Paramitha, S., Enhancement of Subsurface Geologic Structure Model Based on Gravity, Magnetotelluric, and Well Log Data in Kamojang Geothermal Field, In IOP Conference Series: Earth and Environmental Science, 103(1), 012013. doi: 10.1088/1755-1315/103/1/012013.
Sribudiyani, S., Muchsin, N., Ryacudu, R., Kunto, T., Astono, P., Prasetya, I., Sapiie, B., Asikin, S., Harsolumakso, A.H. & Yulianto, I., The Collision of East Java Microplate and Its Implication for Hydrocarbon Occurrences in the East Java Basin, in Proceeding Indonesian Petroleum Association, 29th Annual Convention, pp. 1-12, 2003.
Marliyani, G.I., Arrowsmith, J.R. & Whipple, K.X., Characterization of Slow Slip Rate Faults in Humid Areas: Cimandiri Fault Zone, Indonesia, J. Geophys. Res.: Earth Surface, 121(12), pp. 2287-2308, 2016. doi: 10.1002/2016JF003846.
Nugraha, A.D., Shiddiqi, H.A., Widiyantoro, S., Thurber, C.H., Pesicek, J.D., Zhang, H., Wiyono, S.H., Ramdhan, M., Wandono & Irsyam, M., Hypocenter Relocation Along the Sunda Arc in Indonesia, Using a 3D Seismic Velocity Model, Seismol. Res. Lett., 89(2A), pp. 603-612, 2018. doi: 10.1785/0220170107.
Wu, Y. & Gao, Y., Gravity Pattern in Southeast Margin of Tibetan Plateau and Its Implications to Tectonics and Large Earthquakes, Earth Planet. Phys., 3(5), pp. 425-434, 2019. doi: 10.26464/epp2019044.
Wada, S., Sawada, A., Hiramatsu, Y., Matsumoto, N. & Okada, S., Continuity of Subsurface Fault Structure Revealed by Gravity Anomaly: the Eastern Boundary Fault Zone of the Niigata Plain, Central Japan, Earth Planets Space, 69, pp. 1-12, 2017. doi: 10.1186/s40623-017-0602-x.
Grandis, H. & Dahrin, D., Constrained Two-dimensional Inversion of Gravity Data, J. Math. Fund. Sci., 46(1), pp. 1-13, 2014. doi: 10.5614/j.math.fund.sci.2014.46.1.1.
Untung, M. & Sato, Y., Gravity and Geological Studies in Java, Indonesia, Geological Survey of Indonesia and Geological Survey of Japan Special Publication, 6, 1978.
Blakely, R.J., Potential Theory in Gravity and Magnetic. Cambridge, 1996.
Grandis, H. & Dahrin, D., The Utility of Free Software for Gravity and Magnetic Advanced Data Processing, IOP Conf. Ser.: Earth Environ. Sci., 62(1), 012046, 2017. doi: 10.1088/1755-1315/62/1/012046
Pirttijarvi, M., GRABLOX: Gravity Interpretation and Modelling Software Based on a 3-D Block Models, User?s Guide to Version, 1, 2008.
Pirttijvi M., Numerical Modeling and Inversion of Geophysical Electromagnetic Measurements Using a Thin Plate Model, PhD thesis, Acta Univ. Oul. A403, Univ. of Oulu 2003.
Arisbaya, I., Lestiana, H., Mukti, M.M., Handayani, L., Grandis, H., Warsa & Sumintadireja, P., Garsela Fault and Other NE-SW Active Faults Along the Southern Part of Java Island, IOP Conf. Ser.: Earth Environ. Sci., 789(1), 012065, 2021. doi: 10.1088/1755-1315/789/1/012065.
Bogie, I., Kusumah, Y.I. & Wisnandary, M.C., Overview of the Wayang Windu Geothermal Field, West Java, Indonesia, Geothermics, 37(3), pp. 347-365, 2008. doi: 10.1016/j.geothermics.2008.03.004.
Rosalia, S., Widiyantoro, S., Cummins, P.R., Yudistira, T., Nugraha, A.D., Zulfakriza, Z. & Setiawan, A., Upper Crustal Shear?wave Velocity Structure Beneath Western Java, Indonesia from Seismic Ambient Noise Tomography, Geosci. Lett., 9(1), pp. 1-14, 2022. doi: 10.1186/s40562-021-00208-5.
Cipta, A., Cummins, P.R., Irsyam, M. & Hidayati, S., Basin Resonance and Seismic Hazard in Jakarta, Indonesia, Geosciences, 8(4), 128, 2018. doi: 10.3390/geosciences8040128.
Arisbaya, I., Study of Active Faults in Southern Garut Area by Using Magnetotellurics (MT) and Gravity Methods (in Indonesian), Doctoral dissertation, Dept. of Geophysical Engineering ITB, 2023.
Arisbaya, I., Wijanarko, E., Warsa, W., Sumintadireja, P., Sudrajat, Y., Handayani, L., Mukti, M.M. & Grandis, H., Magnetotellurics (MT) and Gravity Study of a Possible Active Fault in Southern Garut, West Java, Indonesia, Int. J. Geophys., 1, 4482074, 2023. doi: 10.1155/2023/4482074.
Downloads
Published
How to Cite
Issue
Section
License
Copyright (c) 2024 Journal of Mathematical and Fundamental Sciences
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
