Identifikasi Sesar Gorontalo Dengan Memanfaatkan Data Gravitasi Satelit Resolusi Tinggi

Authors

  • Aina’ul Mardiyah Departemen Fisika, Universitas Andalas
  • Ahmad Fauzi Pohan Departemen Fisika, Universitas Andalas

DOI:

https://doi.org/10.25077/jfu.13.5.658-664.2024

Keywords:

Gravity data, Complete Bouguer anomaly, SVD analysis, Fault

Abstract

The Gorontalo fault is an active fault and is the main source of earthquakes in Gorontalo Province. A strong and destructive earthquake that has occurred in Gorontalo Province was on November 16, 2008 with a magnitude of 7.4 Mw. As one of the disaster mitigation efforts, a research was conducted to identify the type of Gorontalo fault. Data used from global gravity model plus (GGMplus) as free air anomaly data and shuttle radar topography mission (SRTM2Gravity) as modern terrain correction data that rely on full-scale topographic gravity data. These data are used to calculate the complete Bouguer anomaly data. The complete Bouguer anomaly data was subjected to spectrum analysis to obtain the depth of regional and residual anomalies and to separate regional and residual anomalies using the upward continuation method. On the residual anomaly, second vertical derivative (SVD) analysis was conducted to determine the type of Gorontalo fault. The inversion result of 3D model of gravity anomaly shows Gorontalo fault with medium and low density contrast. Based on the SVD analysis, the Gorontalo fault is a turun fault. This geological structure is considered to be a potential source of natural disasters in the Gorontalo region.

References

Aufia, Y. F. (2017). Pendugaan Sesar Daerah “Y” Berdasarkan Anomali Gayaberat Dengan Analisis Derivative.

Badan Nasional Penanggulangan Bencana. (2018). Indeks Risiko Bencana Indonesia.

BMKG. (2023). Gempabumi Tektonik M6,3 di Teluk Tomini, Luwuk, Gorontalo, Tidak Berpotensi Tsunami. https://www.bmkg.go.id/press-release/?p=gempabumi-tektonik-m63-di-teluk-tomini-luwuk-gorontalo-tidak-berpotensi-tsunami&tag=press-release&lang=ID

Hirt, C., Yang, M., Kuhn, M., Bucha, B., Kurzmann, A., & Pail, R. (2019). SRTM2gravity: an ultrahigh resolution global model of gravimetric terrain corrections. Geophysical Research Letters, 46(9), 4618–4627.

Ibrahim, M. M., Utami, P., & Raharjo, I. B. (2022). Analisis Struktur Geologi Berdasarkan Data Gravitasi Menggunakan Metode Second Vertical Derivative (SVD) Pada Lapangan Panas Bumi ”X”. Jurnal Geosains dan Remote Sensing, 3(2), 59.

Jayatri, A. U., Multi, W., & Hayatuzzahra, S. (2023). Identifikasi Keberadaan Sesar Menggunakan Metode Gravitasi dan Analisis Second Vertical Derivative (SVD) di Bagian Selatan Kabupaten Sumbawa. Jurnal TAMBORA, 7(2), 53–57.

Keller, E. A., & Pinter, N. (2002). Active Tectonics: Earthquakes, Uplift, and Landscape. Prentice Hall.

Leni, A. F. F. P. F., Hadi, A. I., Zakariya, H., & Refrizon, R. (2023). Identification of the Manna Segment Sumatran Fault Using GGMplus Gravity Anomaly Data with the Second Vertical Derivative (SVD) Method. Jurnal Ilmu Fisika| Universitas Andalas, 15(2), 123–136.

Manyoe, I. N., Arif, S., & Lahay, R. J. (2019). Earthquake Damage Level of Gorontalo Area Based on Seismicity and Peak Ground Acceleration. Jambura Geoscience Review, 1(1), 7–12.

Margiono, R., Novitri, A., Pevriadi, A., & Zakariya, H. (2021). Identifikasi Sesar Lokal di Wilayah Barat Daya Sumba, Indonesia Berdasarkan Sebaran Hiposenter Gempabumi Dan Data Gravitasi. Jurnal Meteorologi dan Geofisika, 22, 67. https://doi.org/10.31172/jmg.v22i2.824

Pasau, G., & Raharjo, S. S. (2014). Identifikasi Sesar di Wilayah Gorontalo dengan Analisis Mekanisme Bola Fokus. Jurnal MIPA, 3(1), 40–43.

Pasau, G., & Tanauma, A. (2011). Pemodelan sumber gempa di Wilayah Sulawesi Utara sebagai upaya mitigasi bencana gempa bumi. Jurnal Ilmiah Sains, 11(2), 202–209.

Pohan, A. F., Sismanto, S., Nurcahya, B. E., Lewerissa, R., Koesuma, S., Saputro, S. P., Amukti, R., Saputra, H., & Adhi, M. A. (2023). Utilization and modeling of satellite gravity data for geohazard assessment in the Yogyakarta area of Java Island, Indonesia. Kuwait Journal of Science.

USGS. (2008). M 7.4 - 135 km NW of Gorontalo, Indonesia. https://earthquake.usgs.gov/earthquakes/eventpage/usp000gnur/executive

Zakariya, H., Margiono, R., Novitri, A., & Pevriadi, A. (2022). Identifikasi Anomali Gravitasi Di Wilayah Sulawesi Tenggara Berdasarkan Data Gravitasi GGMplus. PROGRESS: Jurnal Geofisika, 1(1), 63–68.

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Published

2024-09-02

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