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All Journal Jurnal Spektra Jurnal Penelitian Pendidikan IPA (JPPIPA) Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal)
I Gusti Ketut Satria Bunaga, I Gusti Ketut Satria
Sekolah Tinggi Meteorologi Klimatologi dan Geofisika, Komplek Meteorologi Jl. Perhubungan No.5 Pondok Betung, Pondok Aren, Tangerang Selatan 15221
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Education Materials Science & Nanotechnology Physics

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RELOKASI PARAMETER HIPOSENTER DI WILAYAH NUSA TENGGARA BARAT (NTB) DAN SEKITARNYA DENGAN MENGGUNAKAN METODE DOUBLE DIFFERENCE Bunaga, I Gusti Ketut Satria; Purwana, Ibnu; Muzli, M.
Jurnal Spektra Vol 16, No 2 (2015): Spektra: Jurnal Fisika dan Aplikasinya
Publisher : Jurnal Spektra

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Abstract

AbstrakWilayah Nusa Tenggara Barat (NTB) dan sekitarnya merupakan salah satu wilayah dengan tingkat kejadian gempabumi yang tinggi. Kejadian tersebut dikarenakan oleh dua aktivitas tektonik, yaitu subduksi antar dua lempeng (Indo-Australia dan Eurasia) dan aktivitas back arc thrust. Aktivitas ini dapat diidentifikasi melalui penentuan hiposenter gempabumi, salah satunya adalah metode Double-Difference. Metode tersebut digunakan dalam penelitian ini untuk merelokasi hiposenter gempabumi. Hasil relokasi menunjukkan bahwa distribusi gempabumi dapat terelokasi dengan baik berdasarkan tampilan kedua sumber kejadian gempabumi yang semakin jelas.Kata Kunci : hiposenter,Double-Difference, relokasi,subduksi, dan back arc thrust. AbstractWest Nusa Tenggara area and its vicinity are the regions which have  high level of earthquake occurrences . These events are caused by two tectonic activity which are subduction of two plates (Indo-Australia plate and Eurasia) and the back arc thrust activity. This activity can be identified by the determination of the earthquake hypocenter, one of which is Double-Difference method . This method was used in this research to relocate the earthquake hypocenter. The relocated results show that earthquake distributioncan be relocated well based on the image of two tectonic activity which are more clearly.Keyword: hypocenter,Double-Difference, relocation, subduction, and back arc thrust.
Analisis Variasi Temporal Magnitude of Completeness (Mc) dan b-value di Wilayah Bali-Nusa Tenggara Tahun 2017-2023 Bunaga, I Gusti Ketut Satria; Laily, Ein Nuzulul; Anggoro, Chadek Dimas Rakadhio; Nafi, Kautsar; Ariyani, Izza Mitha; Nugroho, Cahyo
Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal) Vol. 6 No. 3 (2025): Agustus
Publisher : Mataram University

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Abstract

Abstract: Penelitian ini menganalisis variasi temporal magnitude of completeness (Mc) dan b-value di wilayah Bali–Nusa Tenggara selama periode 2017–2023. Estimasi Mc dilakukan menggunakan metode Maximum Curvature (MAXC), sedangkan b-value dihitung dengan pendekatan Maximum Likelihood Estimation (MLE). Hasil menunjukkan bahwa nilai Mc dan b-value berfluktuasi dari tahun ke tahun, seiring dengan peningkatan jumlah dan distribusi sensor seismik. Nilai Mc cenderung menurun setelah 2019, menunjukkan peningkatan sensitivitas sistem pemantauan. Sementara itu, variasi b-value mencerminkan perubahan kondisi tegangan di kerak bumi. Temuan ini diharapkan berkontribusi pada pengembangan model bahaya gempa bumi dan strategi mitigasi di wilayah Bali – Nusa Tenggara kedepannya. Keywords: Mc, b-value, Bali-Nusa Tenggara, MAXC, MLE, gempabumi
Penentuan Model Kecepatan Seismik 1-D di Pulau Lombok Bunaga, I Gusti Ketut Satria; Rosid, Mohammad Syamsu; Anggono, Titi; Septiadhi, Ardhianto
Jurnal Penelitian Pendidikan IPA Vol 9 No 12 (2023): December
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v9i11.6023

Abstract

The interpretation of local geology structure can be done effectively by using an appropriate local seismic velocity model. It is suitable to implement in Lombok Island that the local fault activity near Mount Rinjani caused the 2019 East Lombok Earthquake. This study determines and updates the 1-D seismic velocity model using the VELEST by applying the Coupled Hypocenter-Velocity method. The 2010-2022 earthquake data from the catalog of BMKG is used for this study. A total of about 166 events (M ≥ 4) and 20 seismic stations in Lombok and surrounding areas are utilized in this study. The local model (Koulakov) and global (AK-135) are selected as the initial model. The double-difference method is also used to test both velocity models refining the hypocenter location. The results show that the updated Koulakov model has a high relevance in representing the crustal structure of Lombok Island according to the parameters of RMS value, uncertainties hypocenter, and seismic interpretation. It demonstrates not only the local geology condition but also a more reliable seismic velocity model in the region of Lombok Island. This model can be used as a reference for interpreting the better geological structure.
Co-Authors Anggoro, Chadek Dimas Rakadhio Ariyani, Izza Mitha Cahyo Nugroho, Cahyo Ibnu Purwana, Ibnu Laily, Ein Nuzulul M. Muzli Nafi, Kautsar Rosid, Mohammad Syamsu Septiadhi, Ardhianto Titi Anggono