IDENTIFICATION OF EARTHQUAKE AND TSUNAMI RISK ZONES IN SOUTHERN JAVA USING GRAVITY METHOD

Isna Karima, Agustya Adi Martha, Nurul Hudayat, Tati Zera

DOI: http://dx.doi.org/10.32693/bomg.40.2.2025.934

Abstract


The southern part of Java has a high level of disaster risk because it is affected by a subduction zone where the Indo-Australian plate thrusts beneath the Eurasian plate. Six tsunami events occurred in the southern part of Java, caused by earthquakes in the area, based on BMKG catalogue data from 416 to 2023. Given the very large population on the island of Java, the possibility of causing more casualties is greater. Therefore, it is very necessary to have thorough mitigation preparation to estimate the possibility of areas experiencing a large earthquake that triggers a tsunami. This study aims to determine areas with a high level of earthquake and tsunami risk distribution using the gravity method with data from the TOPEX satellite in the form of free air anomaly data and topographic data. After data processing and an anomaly map were obtained, it showed that areas with a high level of earthquake risk were located around the subduction zone and Java Trench. This is due to the geological conditions of the southern part of Java, located in the subduction zone where many active faults were found.


Keywords


Earthquake; Tsunami; Gravity; Subduction Zone; Southern Java

Full Text:

PDF

References


Anggarajati, B., Yatini, Y., dan Raharjo, W., 2024. Application of K-means clustering and B-value algorithms for analysis of earthquake dangerous zones in Java Island. International Journal of Advances in Applied Sciences, 13(4): 907–915.

Ashar, M.I., 2017. Subsurface modeling of the South West Java subduction zone based on gravity field anomaly data. Youngster Physics Journal, 6(4): 382–387.

Basid, A., dan Hidayat, N., 2011. Gravity anomaly analysis as a reference in determining the subsurface geological structure and geothermal potential (Case study in Songgoriti Area, Batu City). Jurnal Neutrino, 4(1): 35–47.

Erlangga, W., 2020. Characteristics and parameters of subduction sources of earthquake on Java Island. TEKNISIA, 25(2): 88–98.

Haryanto, I., 2006. Paleogen and Neogen geological structure in West Java. Bulletin of Scientific Contribution: Geology, 4(1): 88–95.

Helmi, F., dan Haryanto, I., 2008. Regional structural pattern of West Java. Bulletin of Scientific Contribution: Geology, 6(1): 57–66.

Hudayat, N., Rahman, S.A.N., Martha, A.A., Sutrisno, S., dan Wulandari, A., 2024. Identification of subsurface structures and potential reservoir zones of geothermal fields based on gravity data analysis in the Karaha–Cakrabuana Area, West Java. Iranian Journal of Geophysics, in press.

Indriana, R.D., 2008. Analysis of the subduction plate tilt angle in South Central Java and East Java based on gravity anomalies and volcanic tectonic implications. Berkala Fisika, 11(3): 89–96.

Jayadi, H., Janat, N.R., Santosa, B.J., Warnana, D.D., Nugraha, A.D., Leopatty, H., Asyhar, I.F., Meidji, I.U., Fitriana, T., dan Ninasafitri, 2023. Hypocenter relocation of local earthquake using double difference method in Central Sulawesi from BMKG network data: Time periods of July 26 – August 18, 2021. IOP Conference Series: Earth and Environmental Science, 1157(1): 012023.

Juwita, W., Juventa, J., Setiawan, A.M., Martha, A.A., Hudayat, N., dan Sutedja, B., 2024. Identification of potential hydrocarbon traps using the gravity method in the Bengkulu Basin. Iranian Journal of Geophysics, 18(3): 69–83.

Martha, A.A., Setiawan, A., dan Setiadi, T.A.P., 2023. Utilization of global gravity model plus (GGMPlus) to identify fault structures in Mamasa District, West Sulawesi. AIP Conference Proceedings, 030006: 1–6.

Novitri, A., Margiono, R., Pevriadi, A., Zakaria, H., dan Segoro, Y.A., 2025. Modeling of three-dimensional subsurface structures based on gravity anomaly in Southwest Sumba, Indonesia. Indonesian Physical Review, 8(1): 253–267.

Prananda, Y., Zera, T., dan Sunarya, D., 2022. Analysis of the spatial and temporal distribution of seismotectonic parameters in the West Java and Banten region based on the A-value and B-value for the period 1971–2021. Buletin Meteorologi, Klimatologi, dan Geofisika, 2(3): 24–34.

Sandwell, D.T., dan Smith, W.H.F., 1997. Marine gravity anomaly from Geosat and ERS-1 satellite altimetry. Journal of Geophysical Research, 102(B5): 10039–10054.

Saraswati, A.T., dan Anjasmara, I.M., 2014. Analysis of gravity anomaly on the condition of tectonic setting of Sunda Megathrust subduction zone in the west of Sumatera Island. Geoid, 10(1): 75–80.

Soehaimi, A., 2008. Seismotectonics and earthquake potential in Java region. Indonesian Journal on Geoscience, 3(4): 227–240.

Telford, W.M., Geldart, L.P., dan Sheriff, R.E., 1990. Applied Geophysics. Cambridge University Press, Cambridge, 770p.

TOPEX, 2025. Marine gravity from satellite altimetry.

https://topex.ucsd.edu/cgi-bin/get_data.cgi [Accessed on 12 January 2025].

Wibowo, R., Setiadi, I., Firdaus, Y., dan Rahardian, R., 2024. Gravity modeling of subsurface structures and reservoir characterization using seismic inversion in the Nias Basin. Bulletin of the Marine Geology, 39(2): 69–84.




DOI: http://dx.doi.org/10.32693/bomg.40.2.2025.934

Accredited by Ministry of Research, Technology, and Higher Education, Republic Indonesia 

Abstracted/Indexed by: