Landslide Potential Investigation for Disaster Risk Reduction in Central Bengkulu Regency, Bengkulu Province, Indonesia

Abstract

Bengkulu Province is the converging path region between the Indo-Australian − Eurasian tectonic plates in the ocean and the Sumatran fault crossing on the mainland. The condition implies that the sliding force of the slab is easy to trigger fractures and to cause the material to be relatively less elastic, resulting in high seismic intensity. This study aims to identify areas with the potential for landslides and its mapping, and to analyze the factors that cause landslides in Central Bengkulu Regency, Bengkulu Province, Indonesia. This study was conducted using rock physical parameters of ground shear strain (GSS) which were correlated with parameters of slope, slope height, Vs 30 value, fault distance to measurement point, rock conditions, rainfall, and PGA value. Furthermore, these parameters were overlaid thoroughly by the statistical method of the Analytical Hierarchy Process (AHP). Data acquisition is divided into two stages, namely the secondary data collection stage and the field survey stage. Secondary data collection was carried out to support the creation of landslide potential maps, analysis, and field survey data input. Secondary data is the value of Vs 30 , the distance of the fault to the measurement point, rainfall, and the PGA value. Field survey data are in the form of GSS values, slope, slope height, and rock conditions. The results of this study are identified areas that have the category of high, medium, and low landslide potential. Based on the calculated parameters, the GSS parameter is the most dominant which affects the landslide potential in the studied area.

Zonation of Seismic Vulnerability Levels in South Bengkulu Regency, Indonesia for Disaster-Based Regional Planning

“…Referring to BSSC (2020), the study area is predominantly characterized by very dense sand or hard clay, and soft rock, with some locations showing dense sand or very stiff clay and medium dense sand or stiff clay, particularly in the southwest and northeast directions. Based on the rock site class, this research area comprises only very dense soil (SC) and rock (SB) (Hadi et al, 2023). To facilitate the sustainable development of disaster-resilient areas, it is crucial to avoid locations with a high potential for earthquake threats, construct facilities and infrastructure that adhere to earthquake standards, enhance community and government capacity through sustained mitigation and preparedness efforts, and establish integrated and systematic early warning systems (BNPB, 2012;Hadi et al, 2021a).…”

“…Hulusimpang Formation (Tomh) is located to the south, center and northeast of Manna city. Additionally, the geological formations, characterized by soft rock lithologies, contribute to a heightened level of seismic vulnerability especially in rocks that have experienced weathering (SNI, 2019;Hadi et al, 2018;Hadi et al, 2021b;Hadi et al, 2021c). Figure 1 shows the exist-ence of the main Sumatran Fault in the Manna segment, secondary faults across the South Bengkulu Regency, and their associated geological formations.…”

Mapping Landslide Vulnerability using Machine Learning Approach along the Taba Penanjung-Kepahiang Road, Bengkulu Province

“…Several previous studies regarding landslides on the Bengkulu-Kepahiang Cross Route, such as Suhendra & Sugianto, 2018;Hadi et al, 2021;Hadi & Siswanto, 2016;and Sugianto, 2021. In general, studies on landslides that previous researchers have carried out show that the area on the Bengkulu-Kepahiang Cross Route has the potential to experience ground movement. However, the previous study was still carried out deterministically, and the parameters used were still very few, so it is necessary to map landslide-prone areas on the Bengkulu-Kepahiang Cross Road.…”