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All Journal Forum Geografi Journal of Geoscience, Engineering, Environment, and Technology Journal of Physics and Its Applications Indonesian Physical Review Jurnal Widya Climago Indonesian Journal of Environment and Disaster Jurnal Ilmu Fisika dan Terapannya (JIFTA) Jurnal Stasiun Geofisika Sleman (JSGS) Sunan Kalijaga Journal of Physics
Bambang Sunardi, Bambang
Pusat Penelitian dan Pengembangan Badan Meteorologi Klimatologi dan Geofisika Jl. Angkasa I No 2 Kemayoran, Jakarta
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An Estimation of Earthquake Impact to Population in Makassar by Probabilistic Approach Sunardi, Bambang; Sulastri, Sulastri
Forum Geografi Vol 30, No 2 (2016): December 2016
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v30i2.2591

Abstract

Makassar is one of Indonesian big cities with rapid growth rate, but not totally safe from earthquake hazard. This condition led study on affected population by earthquakes in this city are important to do. This paper estimated the population of Makassar City threatened by the probabilistic earthquake hazard. In this current study, earthquake hazard in the forms of peak ground acceleration (PGA) and spectral acceleration,  estimated by using Probabilistic Seismic Hazards Analysis (PSHA). The PSHA result then overlaid with administration map and population data to obtain distribution and percentage of population threatened by the probabilistic earthquake hazard. The results showed the smallest value of ground acceleration located in the south-west (Tamalate sub district), further north increased and reached the highest value in the northeast (Biring Kanaya sub district). Both Tamalate and Biringkanaya can be classified as rural area with low population density.  The urban area of Makassar, which is the concentration of population, located in the centre of Makassar, got the middle earthquake hazard.
Tsunami Modeling Using DEMNAS and DEM Data from UAV Surveys for Planning Evacuation Routes on Samas Coast, Bantul Regency Sihombing, Sulpisius; Sudarmaji; Sunardi, Bambang; Darmawan, Herlan
Journal of Geoscience, Engineering, Environment, and Technology Vol. 9 No. 2 (2024): JGEET Vol 09 No 02 : June (2024)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2024.9.2.14777

Abstract

The interaction between the Indo-Australian plate and the Eurasian plate exerts significant influence on seismic activities within the southern seas of Java Island, with potential repercussions extending to the triggering of tsunamis. Given the densely populated nature of this area, especially along the southern region of Yogyakarta Province, the coast of Samas Beach and its surroundings, mitigation efforts are needed to reduce the potential loss of life caused by tsunamis. One of the mitigation efforts is making a tsunami model which can be done using the help of DEMNAS and DEM topographical data from unmanned aerial vehicle (UAV) photogrammetry. The COMCOT software is a tool used in modeling tsunamis based on a numerical model of the shallow water equation that processes tsunami generator parameters and DEM data into an accurate tsunami model. The modeling results show that the tsunami waves will reach the Samas coast in the 38th minute after the occurrence of the earthquake. The maximum height of the tsunami inundation obtained using DEMNAS data was 21.72 m while using the UAV-DEM it was obtained 23.34 m. Comparison of modeling using DEMNAS and UAV-DEM data shows that image data collection using UAV has good resolution and has high accuracy so that it is able to produce a tsunami model that better shows the propagation of a tsunami in the actual field. The location used as a temporary/final evacuation site is Tegalsari Elementary School because of its strategic location and in tsunami modeling, this location is in the very low risk zone.
Identifikasi Kawasan Rawan Longsor di Banjarsari, Purwoharjo, Kulon Progo Menggunakan Metode HVSR dan Vs30 Sunardi, Bambang; Kartiko, Ilham Bayu
Jurnal Stasiun Geofisika Sleman Vol. 2 No. 2 (2024): Jurnal Stasiun Geofisika Sleman (JSGS) - Desember 2024
Publisher : Stasiun Geofisika Kelas I Sleman

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Abstract

Landslides are processes involving the downward movement of material, such as rocks or soil, influenced by topographical, geological, and soil characteristics. The Banjarsari, Purwoharjo areas have been identified as having a high potential for landslide hazards due to their diverse and vulnerable soil conditions. This study utilized microtremor data analyzed using the HVSR and Vs30 methods to conduct microzonation to identify areas with a high potential for landslides. Key parameters analyzed include dominant frequency (f0), amplification (A0), seismic vulnerability index (Kg), peak ground acceleration (PGA), average shear wave velocity (Vs30), ground shear strain (GSS), and slope gradient. The analysis also involved a comparison of the Vs30 values obtained in this study with the USGS reference values. The microzonation results indicate that locations 2, 3, and 4 have the highest landslide vulnerability levels compared to other areas. These findings provide a critical basis for landslide disaster mitigation planning in the Banjarsari, Purwoharjo regions and serve as a reference for geophysics-based disaster risk management.
Probabilistic Analysis of Hazard Soil Movement Based on Maximum Ground Acceleration Spectrum Patterns Due to the Malang Raya Earthquake Marbun, Yorgita Naully; Basid, Abdul; Ilham, Ilham; Ginting, Rika Adelina; Sunardi, Bambang
Journal of Physics and Its Applications Vol 7, No 1 (2024): November 2024
Publisher : Diponegoro University Semarang Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jpa.v7i1.24545

Abstract

Earthquakes occur when tectonic plates beneath the earth's surface shift due to pressure accumulated in rocks, releasing kinetic energy and causing earthquake waves. This study analyzes the potential risk of earthquake hazards using the Probabilistic Seismic Hazard Analysis (PSHA) method which is based on the calculation of the probability of earthquake occurrence and vibration intensity using data from 3 sources of subduction earthquakes, faults and background earthquake sources in the Malang Raya research area which is geographically located in the Indonesian archipelago with an active collision zone of the Indo-Australian plate with the Eurasian plate. Research processing uses Zmap and R Crisis software. The results of the study show that peak ground acceleration has a value on the bedrock ranging from 0.169 g to 0.255 g. The ground acceleration spectrum at T = 0.2 seconds ranges from 0.288 g to 0.464 g, while at T = 1 second ranges from 0.150 g to 0.275 g. The distribution of PGAm values on the surface ranges from 0.174 g to 0.273 g, and the ground acceleration spectrum at T = 0.2 seconds ranges from 0.302g to 0.551g, while at T = 1 second it ranges from 0.151 g to 0.284 g. The area that shows the highest earthquake vulnerability value is around the southern coast of Malang Raya because it is close to the earthquake source. The northern region experiences an increase in the acceleration spectrum value due to its proximity to the source of the fault earthquake and several other geophysical factors.
PEMODELAN GUNCANGAN TANAH DI PERMUKAAN BERDASARKAN KARAKTERISTIK SITE DI KABUPATEN SLEMAN Handayani, Meila Prati; Irayani, Zahroh; Sunardi, Bambang
Jurnal Ilmu Fisika dan Terapannya Vol 11, No 2 (2024): Jurnal Ilmu Fisika dan Terapannya (JIFTA)
Publisher : Prodi Fisika, Departemen Pendidikan Fisika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/fisika - s1.v11i2.22265

Abstract

Gempa bumi merupakan salah satu bencana alam yang sering terjadi di DaerahIstimewa Yogyakarta (DIY), termasuk Kabupaten Sleman. Hal ini disebabkankarena Kabupaten Sleman berada di dekat Sesar Opak. Oleh karena itu, diperlukanupaya mitigasi untuk meminimalisir dampak gempa bumi, salah satunya melaluipemodelan guncangan tanah berdasarkan karakteristik site lokal. Karakterisasi sitemerupakan upaya untuk mengukur perilaku gelombang seismik pada suatu lokasitertentu berdasarkan sifat geofisika dekat permukaan. Karakterisasi site didasarkanpada nilai Vs30 USGS. Pemodelan guncangan tanah ini bertujuan untukmemperkirakan nilai kecepatan gelombang geser rata-rata hingga kedalaman 30 m(Vs30), Kedalaman 1000 m (Z1.0), kedalaman 2,5 km (Z2.5), PGA dan spectraacceleration di batuan dasar dan permukaan berdasarkan karakteristik site lokal..Metode yang digunakan untuk memodelkan menggunakan metode DeterministicSeismic Hazard Analysis (DSHA) dengan skenario terburuk gempa bumi dari SesarOpak yang diolah menggunakan Software OpenQuake. Hasil menunjukkan bahwaVs30 di Kabupaten Sleman didominasi nilai yang relatif rendah (180 m/s). NilaiPGA relatif tinggi di batuan dasar mencapai 0,65 g sedangkan PGA di permukaantanah mencapai 0,75 g. Nilai spectral acceleration (0,2) relatif tinggi di batuandasar mencapai 1,5 g sedangkan spectra acceleration (0,2) di permukaan mencapai1,8 g. Nilai spectral acceleration (1,0) relatif tinggi di batuan dasar mencapai 0,4 gsedangkan nilai spectral acceleration (1,0) di permukaan mencapai 0,88 g. Nilaiamplifikasi PGA dan nilai amplifikasi spectral acceleration (0,2) tertinggi 1,36serta nilai amplifikasi spectral acceleration (1,0) tertinggi 2,98. Hal inimengakibatkan beberapa daerah di Kabupaten Sleman memiliki kerawanan yangtinggi terhadap bencana gempa bumi sehingga cenderung memberikan responguncangan yang lebih besar.
ANOMALI GAS RADON SEBAGAI PREKURSOR GEMPABUMI DI SEKITAR SESAR PALUKORO Sulastri, Sulastri; Nursarifa, Saskia; Sunardi, Bambang; Rohadi, Supriyanto; Nugroho, Cahyo; Perdana, Yusuf Hadi
Jurnal Widya Climago Vol 2 No 2 (2020): Adaptasi Kebiasaan Baru
Publisher : Pusdiklat BMKG

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Abstract

Radon gas concentration anomalies before the occurrence of earthquakes have been detected in many majoearthquake cases in the world, so they can be considered as early signs or earthquake precursors. The BMKGhas installed a radon gas concentration measuring device equipped with gauges of air pressure, air temperatureand rainfallaround the Palukoro Fault, namely at the Tadulako Earthquake Precursor Station. This study aims todetermine the existence of earthquake precursors around the PaluKoro Fault recorded by the Tadulako PrecursorStation, by utilizing the radon and air pressure sensors installed at the station. The data used are radon data and air pressure data in 2016 as well as data on earthquake events that occurred around the Palukoro Fault in thesame year.The data analysis method was carried out in three stages. First, the selection of an earthquake with acertain distance from Tadulako, where the possibility of the radon precursor can still be detected. Second, analysiof radon data anomalies using statistical methods, namely outside the mean ± 2 standard deviations, and lookingat earthquake data that corresponds to the radon anomaly. Third, selecting radon anomalies which are consideredas earthquake precursors whose rate of change is inversely proportional to the rate of change in air pressureThe analysis results show 9 radon gas anomalies detected in the second step and 4 radon gas anomalies thatfulfill the third step. This method needs to be tested on radon and air pressure data from BMKG precursor stationselsewhere.
Earthquake Hazard Analysis in Probolinggo Region as a Mitigation Effort Using Probabilistic Seismic Hazard Analysis Method: Analisis Bahaya Gempa Bumi Di Wilayah Probolinggo Sebagai Upaya Mitigasi Menggunakan Metode Probabilistic Seismic Hazard Analysis Al Ghifari, Muhammad Taufiq Akbar; Sunardi, Bambang; Susanti, Dwi Budi; Handayani, Wuri
Sunan Kalijaga Journal of Physics Vol. 6 No. 1 (2024): Sunan Kalijaga Journal of Physics
Publisher : Prodi Fisika Fakultas Sains dan Teknologi UIN Sunan Kalijaga Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14421/physics.v6i1.5153

Abstract

Probolinggo is one of the areas traversed by an active fault, namely the Probolinggo Fault. As an area that is prone to earthquake disasters, Probolinggo needs to have an earthquake hazard modeling as a mitigation effort to minimize the impact of an earthquake that occurs in the future. Earthquake hazard modeling is a multidisciplinary science that aims to predict earthquakes, and the ground shaking they produce. One method that can be used is Probabilistic Seismic Hazard Analysis (PSHA). This study aims to analyze the earthquake hazard in Probolinggo area using the PSHA method as an effort to mitigate earthquake prone areas. The data used is historical earthquake data from the Agency for Meteorology, Climatology, and Geophysics (BMKG) for the 1973-2020 period with a magnitude of Mw ≥ 5, a depth of 0-300 km, and a radius of 300 km from the study area. The earthquake source model used includes megathrust, faults, and background earthquake sources. Three sets of Ground Motion Prediction Equation (GMPE) were used for each earthquake source. PSHA was performed for the condition of a 2% probability of being exceeded in 50 years. The average shear wave velocity to a depth of 30 m (Vs30) from the United States Geological Survey (USGS) were used to model the peak ground acceleration on the surface. The results showed that the peak ground acceleration (PGA) at bedrock ranged from 0.27 to 0.71 g. PGA at the surface (PGAM) ranges from 0.27 to 0.83 g. The distribution of the amplification value in Probolinggo area is 1.02 to 1.12. The earthquake hazard analysis obtained shows that the northern part of the Probolinggo area has a higher earthquake hazard than the southern part. The results of the study can be used as consideration in regional development based on earthquake risk reduction.
THE ANALYSIS OF SEISMOTECTONICS, PERIODICITY, AND CHANGING OF QUAKES LEVEL IN WEST NUSA TENGGARA AREA BASED ON 1973 – 2015 DATA Istiqomah, Melinda Utami; Sunardi, Bambang; Marzuki, Marzuki; Minardi, Suhayat
Indonesian Physical Review Vol 2, No 1 (2019)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (925.853 KB) | DOI: 10.29303/ipr.v2i1.20

Abstract

This research was conducted as one of the earthquake disaster mitigation efforts in Nusa Tenggara Barat region, because this region is one of the regions in Indonesia which has a relatively high level of seismicity. The purpose of this research is to determine seismotectonic parameter, earthquake periodicity along with the average of seismicity rate changes in Nusa Tenggara Barat region. The data used in this research is the data sourced from the United States Geological Survey (USGS) and Badan Meteorologi Klimatologi dan Geofisika (BMKG) from Januari 1973 until February 2015 for Bali Strait region up to Banda Sea with coordinate boundaries of 1140–1300 East Longitude and 40-130 South Latitude. This research was conducted using the maximum likelihood method with second party of software Zmap ver 6.0 also software ArcGis ver 10 to map seismotectonic parameter, periodicity and the average velocity of seismicity rate changes. Variation b value range between 0.972–1.44, a low value of b are associated with high stress levels, and vice versa. The a value range between 6.67- 9.1, its show that the regions with high a value experience a relatively high earthquake incidence rate, and vice versa. The density of earthquake is about -2.63 to -2.01 logN/km2 or the occurrence of earthquakes in the area is very rare. Earthquake periodicity with magnitude (M) 6 SR is 5 to 18 year, M 6.5 SR is 16 to 67 year, M 7 SR is 54 to 304 year, and M 7.5 SR is 178 to 1.386 year. The average of seismicity rate changes on a case that occurred in Sumbawa in 1982 is more than 125%, meanwhile the earthquake that occurred in 2009 is more than 75%.Copyright © 2019IPR. All rights reserved.
Penentuan Klasifikasi Tanah Dengan Menggunakan Metode Multi-channel Analysis of Surface Waves Di Kapanewon Pleret, Kabupaten Bantul Zawawi, Aditya Fais; Sunardi, Bambang; Setyoajie Prayoedhie, Setyoajie
Jurnal Stasiun Geofisika Sleman Vol. 1 No. 2 (2023): Jurnal Stasiun Geofisika Sleman (JSGS)
Publisher : Stasiun Geofisika Kelas I Sleman

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Abstract

Kapanewon Pleret, Bantul Regency, is one of the areas prone to earthquakes. One of the earthquakes that occurred was the 27 May 2006 earthquake with a magnitude of 6.3. The area most heavily affected by the earthquake was Kapanewon Pleret. The average shear wave velocity to a depth of 30 m (Vs30) is an important criterion in determining soil type classification. One geophysical method for determining Vs30 is the Multichannel Analysis of Surface Wave (MASW) method. The results of research in Kapanewon Pleret using the MASW method show that the Vs30 value in Kapanewon Pleret, Bantul Regency, is in the range of 212 – 396 m/s. Based on the Vs30 value that has been obtained, it can be classified that the soil types in Kapanewon Pleret, Bantul Regency, are dominated by medium soil (SD), and a small portion of very dense soil (SC).
Mikrozonasi Indeks Kerentanan Seismik Menggunakan Metode HVSR di Kapanewon Galur, Kabupaten Kulon Progo Kalyana Mita, Ailing; Sunardi, Bambang; Mardiyanto
Jurnal Stasiun Geofisika Sleman Vol. 1 No. 2 (2023): Jurnal Stasiun Geofisika Sleman (JSGS)
Publisher : Stasiun Geofisika Kelas I Sleman

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Abstract

Kapanewon Galur in Kulon Progo is close to the Progo Fault, a fault with signs of activity about 35 km long. This area is included in a seismically active area because it is close to plate subduction activity, making it prone to earthquakes. This condition makes Kapanewon Galur an area that has the potential to experience earthquakes. The longer existence of the Progo Fault compared to the Opak Fault indicates a greater risk, allowing larger and more destructive earthquakes to occur in the future, compared to the 2006 earthquake in Bantul. Obtaining the dominant frequency (f0) and amplification factor (A0) values using the HVSR method helps to see the seismic vulnerability index (Kg) in the area. The microzonation of the area is also an important criterion for identifying earthquake-prone areas in the Kapanewon Galur area. Findings from research in Kapanewon Galur using the HVSR method show that the f0 ranges from 0.15 to 1.57 Hz, A0 value ranges from 1.24 to 3.61, and Kg ranges from 4.8 to 87.85. By considering these values, it can be concluded that Kapanewon Galur can be classified as an area with a high seismic vulnerability index.
Co-Authors Abdul Basid Al Ghifari, Muhammad Taufiq Akbar Amelia, Tri Cahyo Nugroho, Cahyo Darmawan, Herlan Fajrin, Viola Ginting, Rika Adelina Handayani, Meila Prati Ilham Ilham Irayani, Zahroh Istiqomah, Melinda Utami Kalyana Mita, Ailing Kartiko, Ilham Bayu Koesuma, Sorja Marbun, Yorgita Naully Mardiyanto Marzuki Marzuki Nursarifa, Saskia Perdana, Yusuf Hadi Prayoedhie, Setyoajie Setyoajie Prayoedhie, Setyoajie Sihombing, Sulpisius Sudarmaji Suhayat Minardi Sulastri Sulastri Supriyanto Rohadi, Supriyanto Susanti, Dwi Budi Wuri Handayani Zawawi, Aditya Fais