Analisis Kelurusan Sesar di Daerah Istimewa Yogyakarta Berdasarkan Data Anomali Gravitasi

Iswanudin Iswanudin; Muchamad  Aryono Adhi; Muhamad  Syrojudin

doi:10.31539/j9rs2n42

Authors

Iswanudin Iswanudin Universitas Negeri Semarang
Muchamad Aryono Adhi Universitas Negeri Semarang
Muhamad Syrojudin Badan Meteorologi Klimatologi dan Geofisika (BMKG)

DOI:

https://doi.org/10.31539/j9rs2n42

Abstract

This research aimed to analyze fault lineament patterns based on gravity anomaly data in the Yogyakarta region. The method used is the gravity method. Primary gravity data from BMKG measurements in Bantul Regency, Yogyakarta City, and Sleman Regency were processed to produce a Complete Bouguer Anomaly Map. The data were analyzed using regional-residual anomaly separation, as well as First Horizontal Derivative (FHD) and Second Vertical Derivative (SVD) techniques to clarify geological structure boundaries. The results showed that the complete Bouguer anomaly distribution ranges from 56.06 mGal to 130.38 mGal. Derivative analysis successfully identified two main fault structures: the Opak Fault in the southern part with a southwest-northeast direction spanning approximately 44.8 km, and the Mataram Fault in the northern part with a west-east direction spanning approximately 27.2 km. There is a good correlation between high gravity anomalies and high Vs30 values, which indicates compact rocks and more stable soil conditions against earthquake shocks, and vice versa. In conclusion, two main fault structures were identified in the research area, namely the Opak Fault in the south with a southwest-northeast direction and the Mataram Fault in the north with a west-east direction.

Keywords: Gravity Anomaly, Earthquake Shock, Fault

Author Biographies

Iswanudin Iswanudin, Universitas Negeri Semarang

Mahasiswa Magister Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Negeri Semarang
Muchamad Aryono Adhi, Universitas Negeri Semarang

Dosen Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Negeri Semarang
Muhamad Syrojudin, Badan Meteorologi Klimatologi dan Geofisika (BMKG)

Badan Meteorologi Klimatologi dan Geofisika (BMKG)

References

Ajayakumar, P., & Zeba, N. F. K. (2024). Influence of thick lithomargic soil cover on Bouguer gravity low: Imprints from passive continental margin of southwestern India. Geosystems and Geoenvironment, 3(2), 100252. https://doi.org/10.1016/j.geogeo.2024.100252

Andikasari, L. Y., Syahbana, A. J., Damayanti, C., Atmojo, H. T., Mase, L. Z., & Faris, F. (2024). Scenario seismic hazard analysis of the Mataram fault: An initial study of geophysical approach. BIO Web of Conferences, 131, 04004. https://doi.org/10.1051/bioconf/202413104004

Aziz, K. N., Hartantyo, E., & Niasari, S. W. (2018). The study of fault lineament pattern of the Lamongan volcanic field using gravity data. Journal of Physics: Conference Series, 1011(1), 012025. https://doi.org/10.1088/1742-6596/1011/1/012025

Daryono, M. R., Pamumpuni, A., Wardhana, D. D., & Natawidjaja, D. H. (2023). Mataram fault—New active fault crosses east–west in the centre of Yogyakarta city. IOP Conference Series: Earth and Environmental Science, 1227(1), 012003. https://doi.org/10.1088/1755-1315/1227/1/012003

Firdaus, M. W., Setyawan, A., & Yusuf, M. (2016). Identifikasi letak dan jenis sesar berdasarkan metode gayaberat second vertical gradient studi kasus sesar Lembang, Kota Bandung, Jawa Barat. Youngster Physics Journal, 5(1).

Hamilton, W. (1973). Tectonics of the Indonesian region. Geological Society of Malaysia.

Hiden, H. (2019). Analisis dan pemodelan inversi struktur bawah permukaan berdasarkan anomali gravitasi Pulau Lombok. Indonesian Physical Review, 2(1). https://doi.org/10.29303/i

Kurniawan, S., Erlandi, M., Nadhip, M., Alansyah, A. Y., Wibisono, D. C., Winarti, W., & Qodri, M. F. (2023). Kompilasi penentuan sesar berdasarkan data struktur geologi permukaan dan implikasinya terhadap keberadaan Sesar Mataram di daerah Bokoharjo, Prambanan, Sleman, Yogyakarta. ReTII, 18(1), 402–413.

Lo, Y. T., Ching, K. E., Yen, H. Y., & Chen, S. C. (2023). Bouguer gravity anomalies and the three-dimensional density structure of a thick mudstone area: A case study of southwestern Taiwan. Tectonophysics, 848, 229730. https://doi.org/10.1016/j.tecto.2023.229730

Margiono, R., Novitri, A., Pevriadi, A., & Zakariya, H. (2021). Analisis data gravitasi untuk identifikasi sesar lokal penyebab gempabumi di wilayah barat daya Sumba Indonesia. Jurnal Meteorologi dan Geofisika, 22(2), 67–73.

Mazzaluna, H. P., Rustadi, & Wibowo, R. C. (2024). Geological structure identification using GGMplus satellite gravity data in the area surrounding Mount Tampomas. Eksplorium. https://doi.org/10.55981/eksplorium.2024.6924

Nurwidyanto, M. I., Indriana, D. R., & Darwis, Z. T. (2007). Pemodelan zona Sesar Opak di daerah Pleret Bantul Yogyakarta dengan metode gravitasi. https://www.researchgate.net/publication/266482933

PUSGeN. (2017). Peta sumber dan bahaya gempa Indonesia tahun 2017. Balitbang Kementerian PUPR.

Putri, M., & Annisa, N. (2021). Identifikasi jenis sesar Semangko segmen Sunda di Tenggara Provinsi Lampung dan Barat Laut Provinsi Banten menggunakan metode gravitasi analisa derivatif. Jurnal Indonesia Sosial Sains, 2(6), 936–945. https://doi.org/10.36418/jiss.v2i6.317

Rahardjo, W., Sukandarrumidi, & Rosidi, H. M. D. (2012). Peta geologi lembar Yogyakarta, Jawa. Pusat Survei Geologi.

Riswandi, H., Ikhsan, Maharani, Y. N., Wijayanto, Sunardi, B., Ekarsti, A. K., Rizkianto, Y., & Syaifudin, M. (2023). Pemetaan mikrozonasi bahaya gempabumi sebagai upaya pengurangan risiko bencana di Yogyakarta. Jurnal Mineral, Energi dan Lingkungan, 7(1).

Rosid, M. S., & Siregar, H. (2017). Determining fault structure using first horizontal derivative (FHD) and horizontal vertical diagonal maxima (HVDM) method: A comparative study. AIP Conference Proceedings, 1862. https://doi.org/10.1063/1.4991275

Ryanto, T. A., Suntoko, H., & Setiaji, A. B. W. (2019). Pendugaan awal patahan di Pulau Jawa menggunakan anomali gravitasi dan riwayat kegempaan. Eksplorium, 40(1), 43. https://doi.org/10.17146/eksplorium.2019.40.1.5470

Sadjab, B. A., Indrayana, I. P. T., Kurnia, K., Aziz, K. N., Nur, A. R., Janis, H. B., & Sangian, H. F. (2022). Identifikasi sebaran dan jenis sesar berdasarkan analisis data anomali gravitasi Topex Provinsi Maluku Utara Lembar Pulau Halmahera Utara. Jurnal Fisika Flux, 19(2), 135. https://doi.org/10.20527/flux.v19i2.9616

Salsabila, A., Realita, A., & Fahmi, M. N. (2025). Identifikasi dan interpretasi struktur bawah permukaan kawasan Gunung Bromo–Semeru dengan metode gravitasi. Jurnal Inovasi Fisika Indonesia, 14(2).

Sarkowi, M. (2014). Eksplorasi gaya berat. Graha Ilmu.

Sumintadireja, P., Dahrin, D., & Grandis, H. (2018). A note on the use of the second vertical derivative (SVD) of gravity data with reference to Indonesian cases. Journal of Engineering and Technological Sciences, 50(1), 127–139. https://doi.org/10.5614/j.eng.technol.sci.2018.50.1.9

Sutiono, A., Prastistho, B., Prasetyadi, C., & Supartoyo. (2018). Opak fault: A comparative review. IOP Conference Series: Earth and Environmental Science, 212(1), 012049. https://doi.org/10.1088/1755-1315/212/1/012049

Wahyudi, E. J., Kynantoro, Y., & Alawiyah, S. (2017). Second vertical derivative using 3-D gravity data for fault structure interpretation. Journal of Physics: Conference Series, 877(1), 012039. https://doi.org/10.1088/1742-6596/877/1/012039

Wijayanto, Mardiatno, D., Daryono, Nehren, U., Marfai, M. A., & Sunardi, B. (2022). Characteristics and spatial distribution of Vs30 based on microtremor inversion and MASW data through landform unit in Yogyakarta, Indonesia. Journal of Hunan University Natural Sciences, 49(6), 140–150. https://doi.org/10.55463/issn.1674-2974.49.6.15

Verma, R. K. (1985). Gravity field, seismicity and tectonics of the Indian Peninsula and the Himalayas.