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All Journal Inersia : Jurnal Teknik Sipil dan Arsitektur Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources) Indonesian Geotechnical Journal
Arifan Jaya Syahbana
Pusat Penelitian Geoteknologi LIPI
Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Education Energy Engineering Environmental Science

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Kondisi Geologi dan Pemodelan Kestabilan Lereng Jalur Transek Liwa-Ranau, Liwa, Lampung Barat Iqbal, Prahara; Aribowo, Sonny; Mulyono, Asep; Syahbana, Arifan Jaya
Jurnal Geologi dan Sumberdaya Mineral Vol 18, No 3 (2017): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (415.686 KB)

Abstract

Landslide investigations and slope stability modeling have been carried out on the Liwa-Ranau transect road, West Lampung, with the aim of finding the relationship between geological conditions and landslide events. The research methods that be used in this investigation are geological mapping, disturbed and undisturbed soil sampling, laboratory analysis, slope stability analysis, and structural geology analysis. The Liwa-Ranau transect road has a hills topography with a NE-SW, north-south, and NW-SE direction and relatively sharp curve lineament. Based on the field observations, there are four points of landslides which are distributed in the middle of the transect road. Result of field observation shows soil translational slides and debris flow slides which developed with a 12-15 m wide, 15-55 m height, and 37-75 o slope angle. The sliding soil and rock types consist of sandy tuff, clay soil, and claystone.Keywords: Liwa-Ranau transect road, West Lampung, landslide, slope stability modeling, clay soil, sandy tuff
Analysis of Peak Ground Acceleration (PGA) and Modified Mercalli Intensity (MMI) Scale using PSHA Method in Lampung Province Yahya, Muhammad Harun; Ashari, Almaida Enggar; Syahbana, Arifan Jaya; Kuntjoro, Yanif Dwi; Luthfin, Ahmad
INERSIA lnformasi dan Ekspose Hasil Riset Teknik Sipil dan Arsitektur Vol. 20 No. 2 (2024): December
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/inersia.v20i2.73063

Abstract

Earthquakes are inevitable natural disasters that are challenging to predict, yet effective mitigation is crucial. Lampung Province, located in Indonesia, faces significant tectonic activity due to the Sumatra Fault System (SFS) and the subduction of the Indo-Australian and Eurasian plates. Its strategic location as the gateway to Sumatra Island further underscores the importance of understanding earthquake hazards in the region. This study analyzes earthquake risks in Lampung Province using a micro-scale approach that integrates Peak Ground Acceleration (PGA) and Modified Mercalli Intensity (MMI) values through the PSHA method. The PSHA method identifies earthquake microzonations and generates PGA values that are then converted to the MMI scale to determine the intensity of earthquake strength. The mapping of Lampung Province identified five zones with different levels of earthquake hazard, ranging from VII to XI MMI with varying PGA values. The first zone, on the VII MMI scale, has a PGA ranging from 0.20 to 0.25g. The second zone, in the VIII MMI scale category with PGA ranging from 0.20 to 0.40g. The third zone, falls within the IX MMI scale category with PGA ranging from 0.40 to 0.70 g. The fourth zone is categorized as X MMI scale with PGA values ranging from 0.70 to 1.00g. The fifth zone, has a scale of XI MMI with a range of PGA values between 1.00 and 2.50 g. Areas with higher PGA and MMI scales indicate a greater potential for severe damage, highlighting the need for targeted mitigation strategies in high-risk zones. These findings provide a foundation for disaster preparedness and urban planning in Lampung Province.
Earthquake Hazard Analysis of National Vital Objects by Probabilistic Seismic Hazard Analysis Method in West Java Prayogo, Arif Zidan; Rorosanto, Zahrawani Ifada; Syahbana, Arifan Jaya; Maulita, Ika
INERSIA lnformasi dan Ekspose Hasil Riset Teknik Sipil dan Arsitektur Vol. 21 No. 1 (2025): May
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/inersia.v21i1.72915

Abstract

The Probabilistic Seismic Hazard Analysis (PSHA) method was used to analyze the level of earthquake hazard in West Java Province, Indonesia, which is located between two active tectonic plates. This research integrates literature study, earthquake data collection, and data processing to explore the influence of megathrust, background, fault, and combine earthquake sources on local and national vital objects in the region, such as Pusdik Kopassus, Presidential Palace, Cirebon PLTU, Geothermal Power Plant, Peacekeeping Mission Center (PMPP TNI), PT. PINDAD, PT DAHANA SUBANG, PLM GUNUNG SAWAL, Walahar Dam, PT Indonesia Power UJP Jabar 2 Pelabuhan Ratu, which have important roles in critical infrastructure, defense, and national resilience. The analysis shows variations in maximum ground acceleration between 0.40 g to 1.00 g for background earthquake sources, and 0.00 g to 1.00 g for fault earthquake sources. The research also underscores the importance of mitigation efforts and proper planning to reduce the potential impact of earthquakes in West Java, taking into account the crucial role of national vital objects in maintaining the stability and sustainability of the region. The implications of these findings reinforce the urgency to improve coordination between stakeholders in building earthquake resilience at the local and national levels, and highlight the importance of hazard curve analysis on national vital objects to inform the future of the region.
Sensitivity Analysis of Correlation Distance (R) Parameter Value to PGA Value by Using PSHA Method Sandi, Kurnia; Hutagaol, Agnes Glory Emanuela; Syahbana, Arifan Jaya
Indonesian Geotechnical Journal Vol. 4 No. 1 (2025): Vol.4, No .1, April 2025
Publisher : Himpunan Ahli Teknik Tanah Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56144/igj.v4i1.100

Abstract

Indonesia is one of the countries prone to earthquakes due to its geographical condition, which is located at the confluence of three main tectonic plates: the Indo-Australian Plate, the Eurasian Plate, and the Pacific Plate. In the context of earthquakes, the terms correlation distance and PGA (Peak Ground Acceleration) are known.  Problems in correlation distance (R) only exist in background source earthquakes because of the Smoothed Gridded Seismicity process. PGA is a measure of the maximum ground acceleration that occurs during an earthquake. PGA is used in earthquake engineering to assess the potential damage that may be caused by an earthquake. Therefore, it is necessary to conduct research to determine the effects of the correlation distance parameter (R) on the PGA value using USGS PSHA software. The data used in this study are background earthquake data obtained from the National Earthquake Center Catalog (PuSGeN) in 2017. The research locations include Banten, Lampung, Southeast Sulawesi, West Sumatra, Gorontalo, and Bali. These locations were chosen because of their geographical conditions which are located near or around tectonic plates, making them prone to earthquakes. This research utilizes several modules from the USGS PSHA, namely AgridMLsm, HazgridXnga2, and HazallXL to process background earthquake data using ArcMap software from ArcGIS. The correlation distance (R) used in this study is 25, 50, 75, and 100 km. From the six provinces used as research locations, it is concluded that the difference in distance affects the resulting PGA values. In general, the greater the correlation distance value, the greater the PGA value. However, there are some points where the smaller the correlation distance, the larger the PGA value because these points are close to many earthquake sources.
Co-Authors Ahmad Luthfin Asep Mulyono Ashari, Almaida Enggar Hutagaol, Agnes Glory Emanuela Ika Maulita Kuntjoro, Yanif Dwi Prahara Iqbal Prayogo, Arif Zidan Rorosanto, Zahrawani Ifada Sandi, Kurnia Sonny Aribowo Yahya, Muhammad Harun