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Sukarasa, I Ketut
Udayana University
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Relokasi Hiposenter Gempabumi dengan Menggunakan Metode Double Difference Wilayah Bali dan Sekitarnya Devi Irma Putri; I Ketut Sukarasa; Rudy Darsono; Winardi Tjahyo Baskoro; Ni Nyoman Wendri; I Made Satriya Wibawa
BULETIN FISIKA Vol 25 No 2 (2024): BULETIN FISIKA
Publisher : Departement of Physics Faculty of Mathematics and Natural Sciences, and Institute of Research and Community Services Udayana University, Kampus Bukit Jimbaran Badung Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/BF.2024.v25.i02.p04

Abstract

A study on the relocation of earthquake hypocenters using the Double Difference method has been conducted in Bali and its surrounding areas. This research was carried out at the Center for Meteorology, Climatology, and Geophysics Region III Denpasar. The purpose of this study is to find out the distribution of earthquake hypocenters before and after the relocation and to know the continuity of earthquake hypocenters in the Bali region. The data used are arrival time data of 1,815 earthquake events from January 1, 2014 to December 31, 2023, and data from 26 earthquake recording stations. The relocation method applied is the Double Difference method, which is processed with ph2dt and HypoDD. The relocation that has been carried out shows a good hypocenter position which is characterized by a residual value of travel time that is close to 0. The distribution of the earthquake hypocenter in the Bali area before the relocation spread throughout the region and after the relocation, the position of the hypocenter was getting closer to the source of the earthquake, namely in the subduction zone under the Bali area as shown in the cross-section results. In addition, based on the results of the analysis of the hypocenter of the earthquake after relocation, it was found that the trend of the hypocenter continued toward the subduction subduction zone.
Analisis Peak Ground Accerelation (PGA) di Kabupaten Karangasem Menggunakan Pendekatan Empiris Masitah, Siti; Sukarasa, I Ketut; Dedy Pratama, I Putu; Yuliara, I Made; Suryatika, Ida Bagus Made; Kasmawan, I Gde Antha
Kappa Journal Vol 9 No 1 (2025): April
Publisher : Universitas Hamzanwadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29408/kpj.v9i1.28647

Abstract

Kabupaten Karangasem merupakan bagian dari busur kepulauan Sunda Kecil yang terbentuk akibat proses subduksi lempeng Indo-Australia kebawah lempeng Eurasia sehingga menyebabkan daerah tersebut rawan bencana gempabumi. Penelitian ini bertujuan untuk menentukan nilai peak ground acceleration (PGA) di Kabupaten Karangasem menggunakan rumus empiris terpilih. Data yang digunakan adalah data skunder yang diperoleh dari alat accelerograph tahun 2019-2023 dan data dari katalog BMKG tahun 1972-2022. Dalam menentukan nilai PGA digunakan metode empiris Donovan (1973), Esteva (1970), Mc.Guirre (1963), Fukushima Tanaka (1990), Setiawan (2012). Pada hasil penelitian menunjukkan bahwa rumus empiris Donovan cocok untuk diterapkan di Kabupaten Karangasem. Kabupaten Karangasem bagian timur memiliki tingkat bahaya bencana gempabumi paling besar dengan skala Intensitas VI MMI mencakup Kecamatan Karangasem dan Kecamatan Abang dengan nilai PGA tertinggi yaitu 96 gals.
Studi Pemetaan Kerawanan Gempabumi Berdasarkan Pola-Pola Sesar Menggunakan Focal Mechanism dari Data Gempabumi di Wilayah Bali Crisanti Uduk, Maria; Sukarasa, I Ketut; Tyastama, Arief; Suarbawa, Komang Ngurah; Wendri, Nyoman; Sandi, I Nengah
Kappa Journal Vol 9 No 1 (2025): April
Publisher : Universitas Hamzanwadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29408/kpj.v9i1.29374

Abstract

Research regarding earthquake vulnerability mapping studies based on fault patterns using focal mechanism data from earthquake data in the Bali Region has been carried out. This research aims to determine fault patterns in the Bali region using a focal mechanism from earthquake data for 1976-2021, determine the types of faults in the Bali region when analyzed using the focal mechanism method and determine areas that are prone to earthquakes in the Bali region. The data used are seismograph recordings obtained from the Global Centroid Moment Tensor (CMT) and the United States Geological Survey (USGS). The method used in this research is the focal mechanism method. The results of mapping the distribution of focal balls in the Bali region are that there were 9 earthquake events above 4 M, with 8 events being thrust faults and 1 being an oblique fault. Areas that are prone to earthquakes are in the East Bali region, specifically in Karangasam, and in general earthquakes occur in water areas or at sea. The results of the seismicity map of the distribution of earthquakes show that the depth of earthquakes in the Bali region varies. On the seismicity map, it can be seen that the most dominant ones are earthquakes in the deep and medium earthquake categories, but the most dangerous are earthquakes in the shallow depth category.
Comparison of Seismicity Between the Subduction Zone and Local Fault Zone in the Bali Island Region During the 1963–2023 Period Using the Likelihood Method Nainggolan, Putri Srimalemta; Winardi Tjahyo Baskoro; I Gusti Ketut Satria Bunaga; I Ketut Sukarasa; Nyoman Wendri; I Ketut Putra
Kappa Journal Vol 9 No 2 (2025): Agustus
Publisher : Universitas Hamzanwadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29408/kpj.v9i2.30243

Abstract

Research has been conducted on the comparison of seismicity between the subduction zone and the local fault zone in the Bali Island region during the 1963–2023 period. This research aims to compare the b-value, a-value, seismicity index, and earthquake recurrence period between the subduction zone and the local fault zone. The research was conducted within the observation boundaries of 114,4°–115,7° East Longitude and 11,4°–8,8° South Latitude. The research was carried out at the Center for Meteorology, Climatology, and Geophysics Region III Denpasar using the likelihood method for earthquakes with magnitude ≥ 3,3. The data used were obtained from the official websites of the USGS (United States Geological Survey) and BMKG, with depths ≤ 600 km for the subduction zone and depths ≤ 35 km for the local fault zone. The results show that the subduction zone has a b-value of 0,534 and an a-value of 4,599, while the local fault zone has a b-value of 0,829 and an a-value of 5,087. The seismicity index in the subduction zone ranges from 0,289–13,046 with an earthquake recurrence period of 0,077–3,459 years. Meanwhile, in the local fault zone, the seismicity index ranges from 0,126–8,366 with an earthquake recurrence period of 0,212–7,949 years. Earthquake distribution is dominated in the subduction zone at 82,63% compared to the local fault zone at 17,37%.
IMPACT OF TROPICAL CYCLONE SEROJA ON RAINFALL AND WIND SPEED IN EAST NUSA TENGGARA PROVINCE Kaha, Astried Valentine; Baskoro, Winardi Tjahyo; Sumaja, Kadek; Sukarasa, I Ketut; Paramarta, Ida Bagus Alit; Sandi, I Nengah
Indonesian Physical Review Vol. 7 No. 1 (2024)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v7i1.264

Abstract

Tropical cyclone phenomenon can give impacts such as heavy rain, strong winds, and high waves around its growth area. One of the tropical cyclones that has occurred is Seroja Tropical Cyclone which formed in the Sawu Sea on April 3, 2021. Therefore, this study aims to determine the effect of Seroja Tropical Cyclone on rainfall and surface wind speed in East Nusa Tenggara Province and the percentage comparison of rainfall and wind speed during the Seroja tropical cyclone event with the normal value of rainfall and surface wind speed over a 10-year period. The data used are daily rainfall and surface wind speed data during the Seroja tropical cyclone event, namely April 3 to 12, 2021 and daily average rainfall and wind speed data in April for 10 years in several affected districts in East Nusa Tenggara Province. Data processing is done by calculating the percentage comparison of rainfall and wind speed during the Seroja Tropical Cyclone event with normal rainfall and wind speed in several regions in East Nusa Tenggara. Based on the analysis, heavy to extreme rainfall and strong winds were found in several districts at a radius of about 400 km from the center of the cyclone. Although the category of this tropical cyclone is low, it is able to give impacts in the form of heavy to extreme rainfall and strong winds in the surrounding area. So it can be concluded that the tropical cyclone category does not directly affect rainfall and wind speed in an area, but the distance between the area and the center of the tropical cyclone is more influential in increasing rainfall and wind speed in an area. This is also proven by Sumaja's research in the case of tropical cyclones LUA and Narelle.
Pengaruh Suhu Terhadap Crosswind dan Tailwind di Bandara I Gusti Ngurah Rai Dengan Metode Regresi Nurhalima, Nurhalima; Sukarasa, I Ketut; Sumaja, Kadek
Kappa Journal Vol 7 No 1 (2023): April
Publisher : Universitas Hamzanwadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29408/kpj.v7i1.17606

Abstract

A study of the effect of runway surface temperature (LST) and sea surface temperature (SST) on crosswind and tailwind in 2012-2021 at Ngurah Rai Airport in Bali has been carried out using the regression method. The purpose of this study was to find out what percentage of LST and SST affect crosswind and tailwind events and how LST and SST influence crosswind and tailwind events at I Gusti Ngurah Rai Airport. Based on the results of monthly calculations from 2012-2021, the influence of LST and SST on crosswind and tailwind only has an effect of 0.8-47.7%. Where the greatest influence occurred in the crosswind from the right plane in May, which was 47.7%. Meanwhile, the influence of LST and SST on the biggest tailwind occurred in November at 22.5%, with the overall percentage in all months showing that LST and SST have a weak relationship to crosswind or tailwind. The influence is quite strong only on the right crosswind in May and the left crosswind in March. However, the size of the influence of LST and SST must still be considered because there are several significant months, especially in the left crosswind and tailwind which can be seen in the results of the F-test. In the right crosswind and tailwind the effect of SST is greater than that of LST, while for the left crosswind it is the other way around.
Perbandingan Metode Peluruhan untuk Memperkirakan Berakhirnya Gempabumi Susulan (Studi Kasus Gempabumi Signifikan di Wilayah Bali Tahun 2019-2020) Soleh, Anggun Mohamad; Sukarasa, I Ketut; Gunawan, Tomy; Suarbawa, Komang Ngurah; Sumadiyasa, Made; Anggarani, Ni Kadek Nova
Kappa Journal Vol 7 No 2 (2023): Agustus
Publisher : Universitas Hamzanwadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29408/kpj.v7i2.20743

Abstract

An Data collection and processing has been carried out to compare the aftershock decay method which aims to determine the assumption of aftershock ending time, how much energy, fracture length and fracture velocity occurred on the island of Bali. Data processing using several methods, namely the Omori method, the Mogi method I, the Mogi II method, and the Utsu method. The data used is based on the BBMKG Region III Denpasar earthquake catalog book, that’s is case of the Buleleng earthquake on November 14 2019, the Jembrana earthquake on July 16 2019 and the South Kuta earthquake on March 19 2020. Based on the results of data processing, for the Buleleng earthquake case the method closest to the observations was the Mogi II method with the energy is 1012 joules, the fracture length is 1.186 m and the fracture speed is 29.78 m/s. As for the Jembrana and South Kuta earthquake cases, the results of the calculation of all methods have not come close to the observations. The magnitude of the energy, the length of the fracture and the fracture speed of the Jembrana earthquake is 3.562313 joules, 32.733 m, 327.330 m/s. Whereas for the South Kuta earthquake, the energy, fracture length and fracture velocity were 3.162317 joules, 125.890 m, 70.750 m/s
Pemetaan Tingkat Bahaya Gempabumi Berbasis Percepatan Getaran Tanah Maksimum Dan Intensitas Gempabumi Di Provinsi Bali Kelo, Febriyanti Jia; Yuliara, I Made; Setiawan, Yohanes Agus; Sukarasa, I Ketut; Kasmawan, I Gde Antha; Suardana, Putu
Kappa Journal Vol 7 No 3 (2023): Desember
Publisher : Universitas Hamzanwadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29408/kpj.v7i3.20925

Abstract

The Research has been carried out on the level of earthquake hazard in the Bali region based on maximum ground vibration acceleration (PGA) and earthquake intensity. The data that used in this research were obtained from the BMKG and USGS catalogs. The value of the earthquake hazard level is calculated using the appropriate PGA empirical equation through a correlation test of several empirical equations, namely the Katayama, Mc. Guire, Faccioli, Singh et al, Ambraseys, and Wang & Tao with BMKG observation data.. Based on the correlation test, the Katayama equation (1974) was obtained with the smallest error value of 0.52. The calculation results show that the maximum PGA value ranges from 154-1944 gal and the earthquake intensity ranges from VII to X on the MMI scale with the highest hazard level in the Karangasem, Buleleng, and parts of Jembrana districts.
Studi Pola Sebaran Asap Dan Kondisi Parameter Fisis Meteorologi Berbasis Citra Satelit Himawari-8 (Kasus: Kebakaran Hutan di Provinsi Jambi) Sinaga, Gerson; Yuliara, I Made; Rupiasih, Ni Nyoman; Sukarasa, I Ketut; Adnyna, I. G. A. P; Widagda, I. G. A
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.v8i1.23981

Abstract

This research has conducted a study of smoke distribution patterns and conditions of meteorological physical parameters based on Himawari-8 satellite imagery (Case: Forest Fires in Jambi Province). Data analysis was carried out in this study using Himawari-8 satellite image data with processed RGB False Color method in SATAID software. Meteorological factors such as hot spots, rainfall, air temperature, wind direction and speed are parameters that can affect the process of forest fires and smoke distribution. The data collected in this research is secondary data. The meteorological data and smoke images from BMKG Jakarta center, Jakarta, then the data is processed and analyzed so that it can interpret the meteorological conditions and smoke patterns in Jambi Province. The smoke images that have been collected are then processed using a laptop with SATAID Software on channels 3, 4, and 6 so that the color of the smoke and the distribution of brownish forest fire smoke can be seen in the form of images. Based on the results of the research, the state of meteorological physical parameters in Jambi Province shows a state of drought, hot spots totaling 30 locations from June 24 to 28, 2022, and low rainfall is one of the factors that trigger the process of forest fires, air temperature with an average of <25 ℃ is classified as a moderate temperature during forest fires. satellite image data and meteorological condition data in 2022, wind direction and speed below 29 kt (knots) are categorized as moderate wind gusts. 
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).  
Co-Authors Aditya, I Putu Sukma Nanda Adnyana, I Gusti Agung Putra Adnyna, I. G. A. P Alfha Abrianto L. Tobing Alit Pramarta, Ida Bagus Ardhianto Septiadhi Baskoro, Winardi Tjahyo Bayu Baskara Crisanti Uduk, Maria Daniel Happy Putra Dedy Pratama, I Putu Desiderius Jarut Devi Irma Putri Elvin Riyono Fernandes Flaviana Pinto Gunawan, Tomy Gusti Ngurah Sutapa Heppy Febrian Abdi Bintari Husnul Hatimah Husnul Hatimah, Husnul I G. A. Widagda I Gde Antha Kasmawan I Gede Hendrawan I Gusti Agung Made Duwanda I Gusti Ketut Satria Bunaga I Ketut Putra I Ketut Putra I Made Dwi Wiratmaja I Made Kertayasa I Made Kris Adi Astra I Nengah Sandi I Putu Dedy Pratama I Putu Sukma Nanda Aditya I Wayan Andi Yuda I Wayan Wirata Ida Bagus Alit Paramarta Ida Bagus Alit Paramartha Ida Bagus Made Suryatika Ita Purnamaimun Kadek Sumaja Kaha, Astried Valentine Kelo, Febriyanti Jia Komang Ngurah Suarbawa Lintang Ardhana Reswari Made Prama Yudistira Made Sumadiyasa Mahmud Yusuf Mahmud Yusuf Muhamad Abdul Ghofur Nainggolan, Putri Srimalemta Ni Kadek Nova Anggarani Ni Kadek Sugestiani Ni Luh Gede Desy Suryaningsih Ni Made Rysnawati Ni Nyoman Rupiasih Ni Nyoman Wendri Ni Wayan Meri Monika Sari Nurhalima, Nurhalima Nyoman Wendri Oktaviana Nurhayati Murni Purnamaimun, Ita Rakhmat Prasetia Romadhon Ilham Imani Rudy Darsono Rudy Darsono Rudy Darsono Sanjaya Natadiredja Satriya Wibawa, I Made Septian Jonathan Setiawan, Yohanes Agus Sinaga, Gerson Soleh, Anggun Mohamad Sumaja, Kadek Supardi, I Wayan Threza, Imelda Tobing, Alfha Abrianto L. Tyastama, Arief Wayan Mita Restitiasih Widagda, I. G. A Winardi Tjahyo Baskoro Winardi Tjahyo Baskoro Wisnu Ari Adi Wisnu Ari Adi Yohanes Agus Setiawan Yuliara, I Made