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Baskoro, Winardi Tjahyo
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IDENTIFIKASI STRUKTUR BAWAH PERMUKAAN BERDASARKAN DATA ANOMALI GRAVITASI DI PULAU LOMBOK Threza, Imelda; Baskoro, Winardi Tjahyo; Alit Pramarta, Ida Bagus; Sukarasa, I Ketut; Suardana, Putu; Supardi, I Wayan
Kappa Journal Vol 8 No 1 (2024): April
Publisher : Universitas Hamzanwadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29408/kpj.v8i1.25139

Abstract

Abstract: Research on the identification of subsurface structures based on gravity anomaly data on Lombok Island. This research aims to create a map and determine the value of the complete Bouguer anomaly, regional anomaly, residual anomaly, subsurface density value and create a 2-D model of the subsurface structure. The data used is secondary data, namely satellite gravity anomaly data obtained from the topex website. Data processing in this research uses the gravity method. In this method, gravity correction will be carried out, making a complete bouguer anomaly map, conducting spectrum analysis, separating regional and residual anomalies using butterworth filters and forward modeling to obtain a 2-D model of the subsurface structure. The results of the complete bouger anomaly map are 10.2 to 297.1 mGal, regional anomalies 18.0 to 271.1 mGal and residual anomalies between (-52.9 to 32.4) mGal. The results of forward modeling show that the subsurface geological structure on Lombok Island has a density range between 1 to 2.9 g/cm3, so that from the range of rock density values it can be estimated that the subsurface structure of Lombok Island is divided into East Lombok consisting of Soil rocks (1 to 1.99 g/cm3), Lime Stone (2 to 2, 27 g/cm3), Andesite (2.4 to 2.63 g/cm3) and Basalt (2.71 to 2.99 g/cm3), for West Lombok consists of Lime Stone (2.08 to 2.6 g/cm3), Andesite (2, 68 to 2.77 g/cm3) and Basalt (2.85 to 2.99 g/cm3) and for Central Lombok consists of Andesite (2.41 to 2.72 g/cm3), Basalt (2.84 to 2.99 g/cm3).  
Determining Seismicity Using the Likelihood Method in Sumbawa Island Region Period 1972-2022 Celline; Baskoro, Winardi Tjahyo; Saputra Rahman, Muhammad Soekarno
Kappa Journal Vol 8 No 1 (2024): April
Publisher : Universitas Hamzanwadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29408/kpj.v8i1.25409

Abstract

Research has been carried out regarding the determination of seismicity in the Sumbawa Island region for the period 1972-2022 with observation area boundaries of 116.5° – 119.3° East Longitude and 10° – 8° South Latitude. The research was carried out at the Center for Meteorology, Climatology and Geophysics Region III Denpasar using the likelihood method which was adjusted to the seismicity level M ≥ 3 and depth ≤ 30 km. Determining the b-value was calculated using the likelihood method and obtained b-values for the 4 regions ranging from 0.6 – 0.7 and a-values ranging from 4.7 – 5.4. The return period for earthquakes ranges from 1.03 – 308.1 years. The results show that region 3 has the largest b-value, namely 0.796. The region that has the largest a-value is region 1, namely 5.405. The shortest earthquake return period is region 1 with 1.049 years and the longest is region 3 with 314.6 years.
Co-Authors Alit Pramarta, Ida Bagus Artawan, I Nengah Buana, Muhammad Candra Celline Gunawan, Tomy Gusti Ngurah Sutapa Hanzani, Asril Hidayat, Alyi Savitri Astriyani I Gde Antha Kasmawan I Ketut putra, I Ketut I Nengah Sandi Ida Bagus Alit Paramarta Indrayana, Putu Tedy Kaha, Astried Valentine Keintjem, Regina Gabriel Komang Ngurah Suarbawa KURNIA, WENAS GANDA Made Sumadiyasa Ni Nyoman, Ratini Nurmalasari Nurmalasari Nurmalasari, Ni Putu Yuni Nyoman Wendri Pramarta, Ida Bagus Alit Pratama, Maulana Rizki Prayuda, I Made Ardi Purba, Selpia Putra Adnyana, I Gusti Agung Ramadhan, Rafly Rizqyta Ratu, Trivena Sesilia Saputra Rahman, Muhammad Soekarno Sismanto Sudarsana, Wayan Balik Sukarasa, I Ketut Sumaja, Kadek Supardi, I Wayan Threza, Imelda Trisnawati, Ni Luh Putu Unsuriyah, Zumrotul Wayan Gede Suharta Widagda, I Gusti Agung Widianingsih, Ni Kadek Indah Yuliara, I Made