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All Journal Jurnal Sains dan Teknologi Zona Laut : Jurnal Inovasi Sains dan Teknologi Kelautan Charm Sains : Jurnal Pendidikan Fisika Jurnal Geosaintek
Sriyanto, Sesar Prabu Dwi
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Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Education Energy Engineering Physics Transportation

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RELOKASI HIPOSENTER MENGGUNAKAN METODE MODIFIED JOINT HYPOCENTER DETERMINATION (STUDI KASUS GEMPABUMI LAUT MALUKU TANGGAL 15 NOVEMBER 2019) Sabonbali, Sisca Cicilya; Taunaumang, Heinrich; Dungus, Ferdy; Zulkifli, Muhammad; Sriyanto, Sesar Prabu Dwi
Charm Sains: Jurnal Pendidikan Fisika Vol 1 No 3 (2020): OKTOBER
Publisher : Program Studi Pendidikan Fisika Jurusan Fisika Fakultas Matematika, Ilmu Pengetahuan Alam, dan Kebumian (FMIPAK), Universitas Negeri Manado

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (728.833 KB) | DOI: 10.53682/charmsains.v1i3.50

Abstract

In this study, we determined the accurate hypocenter location of November 15, 2019, the Molucca Sea earthquake aftershocks using the Modified Joint Hypocenter Determination (MJHD) method. This method calculated the hypocenter and seismic station correction simultaneously using the seismic wave travel time inversion. The P and S wave arrival time at each station from the BMKG database was used in this study. After relocated, most of the aftershocks hypocenter categorized as shallow and medium depth earthquakes with the range of focal depth between 25-150 km.
Utilization of Tsunami Modeling in Determining Temporary Evacuation Spots on the Labuan Coast Sariwardoyo, Awanda Muthia; Arifin, Wildan Aprizal; Larasati, Wenny Ananda; Nurokhim, Arif; Sriyanto, Sesar Prabu Dwi
Zona Laut : Jurnal Inovasi Sains Dan Teknologi Kelautan Volume 6, Number 1, March 2025 Edition
Publisher : Departemen Teknik Kelautan Universitas Hasanuddin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62012/zl.v6i1.42265

Abstract

Indonesia is one of the countries with more water surface than land and, in addition, its territory is located between three plates: the Indo-Australian, the Eurasian and the Pacific. This makes Indonesia a country with high volcanic and seismic activity. The abundant news related to mega-earthquakes has made many Indonesians wary of these phenomena. The Sunda Strait is one of the places where megathrustings are expected to occur, and Banten, being a province located in the ocean of the Sunda Strait, makes the level of vigilance high. The modeling process related to tsunami is a representation that can visualize if a large earthquake occurs and causes a tsunami, especially in the coastal area of Labuan subdistrict. The objective of this research is to determine the temporary evacuation spots in tsunami affected areas using tsunami modeling performed with COMCOT (Cornell Multi-grid Coupled Tsunami Grid). The modeling results obtained a wave height to the shoreline of 15 meters with a period to the shoreline of 60 minutes.  Twelve temporary evacuation spots (TES) were determined in this study, 9 of the 12 spots become safe TES because the point has a higher ground level and is out of the inundation range.
PERAN HUTAN PANTAI DALAM MEREDUKSI TSUNAMI MENGGUNAKAN PEMODELAN COMCOT Arnisti, Raissa Alimah; Rosalia, Ayang Armelita; Anzani, Luthfi; Harvan, Muhammad; Nurokhim, Arif; Sriyanto, Sesar Prabu Dwi
Zona Laut : Jurnal Inovasi Sains Dan Teknologi Kelautan Volume 6, Number 1, March 2025 Edition
Publisher : Departemen Teknik Kelautan Universitas Hasanuddin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62012/zl.v6i1.42444

Abstract

Panimbang sub-district is one of the areas affected by the tsunami in 2018, located directly opposite the Krakatau Volcano and close to the Sunda Strait subduction zone (megathrust), making it an area with a high threat of tsunami levels. This study aims to determine the impact of coastal forests in reducing tsunamis using COMCOT modeling as one of the mitigation efforts. The tsunami generator used uses the worst scenario earthquake that can occur in the Sunda Strait subduction zone area. The results show that the coastal forest in Panimbang sub-district with a width of 380 m can reduce the tsunami velocity by 50% compared to the coastal forest with a width of 30 m. In addition, the manning coefficient (n) value also has an influence in reducing the inundation area, inundation level height, and tsunami velocity.
PERUBAHAN COULOMB STRESS AKIBAT GEMPA BUMI LAUT MALUKU 7 JANUARI 2019 Siwi, Pricilia Windy; Sriyanto, Sesar Prabu Dwi; Rondonuwu, Anneke T.; M. Sil, Patricia
Jurnal Geosaintek Vol. 6 No. 3 (2020)
Publisher : Institut Teknologi Sepuluh Nopember

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Abstract

Gempabumi dengan Mw 6,6 mengguncang wilayah Laut Maluku pada tanggal 7 Januari 2019. Gempabumi yang memiliki koordinat episenter pada 2,500 LU dan 126,700 BT dengan kedalaman 34,5 km ini diikuti oleh gempabumi-gempabumi susulan yang tercatat hingga 2 minggu setelah gempabumi utama. Penelitian ini dilakukan untuk mengetahui sebaran perubahan Coulomb stress akibat gempabumi tersebut. Selain itu, dianalisis pula hubungan sebaran perubahan Coulomb stress tersebut dengan lokasi gempabumi susulan. Penelitian ini menggunakan data mekanisme fokal yang diunduh dari katalog Global Centroid Moment Tensor (Global CMT). Perhitungan perubahan nilai Coulomb stress dihitung menggunkan software Coulomb 3.3. Hasil penelitian menunjukkan bahwa gempabumi ini menyebabkan perubahan Coulomb stress dalam rentang -0,5 hingga 0,5 bar tidak hanya di lokasi episenter namun juga di daerah sekitarnya. Sebaran perubahan Coulomb stress secara horizontal membentuk pola 2 lokus negatif dan 2 lokus positif dengan lokasi episenter berada di lokus negatif. Hal ini menunjukkan telah terjadi pelepasan stress batuan melalui peristiwa gempabumi. Lokasi episenter gempabumi susulan sebagian besar berada di area lokus positif dimana terjadi peningkatan stress batuan yang diperkirakan sebagai pemicu terjadinya gempabumi susulan.
Pengaruh Penggunaan Filter Butterworth pada Penentuan Waktu Tiba Gelombang P Sriyanto, Sesar Prabu Dwi
JST (Jurnal Sains dan Teknologi) Vol. 7 No. 2 (2018)
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (520.227 KB) | DOI: 10.23887/jstundiksha.v7i2.13013

Abstract

Penentuan waktu tiba gelombang P cukup sulit dilakukan apabila sinyal memiliki Signal to Noise Ratio (SNR) rendah. Pemfilteran sinyal dapat dilakukan untuk meningkatkan SNR. Pemilihan rentang frekuensi filter harus sesuai dengan kandungan frekuensi gelombang gempabumi karena apabila tidak sesuai akan mendistorsi fase gelombang P dan menyebabkan penentuan waktu tiba gelombang P tidak tepat. Pada penelitian ini dilakukan analisis pengaruh penggunaan 3 jenis filter Butterworth orde 5 pada waktu tiba gelombang P. Jenis filter Butterworth kausal yang digunakan yaitu, filter lowpass 2 Hz, bandpass 2-6 Hz, dan highpass 6 Hz. Hasilnya, secara umum penggunaan filter memberikan efek keterlambatan fase dan pelemahan impuls awal gelombang P yang menyebabkan kesalahan penentuan waktu tiba gelombang P. Jenis filter yang paling bagus digunakan adalah filter bandpass karena kesalahan penentuan waktu tiba gelombang P rata-rata 0.271 detik. Hal ini disebabkan karena gelombang P memiliki frekuensi dominan rata-rata 3.83 Hz. Sementara itu, pemfilteran dengan lowpass dan highpass rata-rata kesalahan masing-masing sebesar 2.183 detik dan 0.347 detik.
Co-Authors Anzani, Luthfi Armelita, Ayang Arnisti, Raissa Alimah Ferdy Dungus Harvan, Muhammad Larasati, Wenny Ananda M. Sil, Patricia Muhammad Zulkifli, Muhammad Nurokhim, Arif Rondonuwu, Anneke T Sabonbali, Sisca Cicilya Sariwardoyo, Awanda Muthia Siwi, Pricilia Windy Taunaumang, Heinrich Willdan Aprizal Arifin