Abstract
Kepahiang regency is an area above the Musi segment of the Sumatran fault system. This condition makes the study area prone to natural disasters such as landslides in the slope area caused by earthquakes due to tectonic plate movement. The objective of this study was to locate potential landslide areas in earthquake-prone areas of Kepahiang regency, Bengkulu province, Indonesia. We performed horizontal to vertical spectral ratio (HVSR) analysis and simple additive weighting (SAW) methods to accomplish the goal. The acquisition of field data involved a broad band seismometer PASI Gemini-2 (triaxial geophone). The microtremor data recorded in the field were then analyzed by the wave spectrum. The results showed that the landslide potential in the study area could be divided into three categories, i.e., low, medium, and high potential. Areas with high potential should be more aware of the threat of landslides, especially in population-dense areas. The greatest threat in the study area is an earthquake along Sumatra’s active fault. An earthquake that occurs in a very steep, landslide-prone area can increase risk and trigger a landslide.
Highlights
Kepahiang is one of the regencies in the province of Bengkulu, Indonesia that has high rainfall throughout the year
The results indicated that the area with the greatest potential for landslides is the inter-city road of Bengkulu to Kepahiang at the 54th kilometer—around Tebatmonok village, Kepahiang subdistrict, Kepahiang regency, with a value of ground shear strain (GSS) of 1.15 × 10−2 and a steepness of the slope of 15–30%
Field data acquisition was conducted for min at Kepahiang regency
Summary
Kepahiang is one of the regencies in the province of Bengkulu, Indonesia that has high rainfall throughout the year. This happens because the area is one of the cross section areas between the wind blowing from Asia and the wind from Australia [1]. Kepahiang Regency is traversed by the Musi segment of the Sumatra fault system [2]. Kepahiang regency is prone to earthquakes due to tectonic movements along faults and bad weather, which can cause storms, landslides, flooding, etc. To reduce the risk of landslides in earthquake-prone areas and support disaster mitigation in Kepahiang regency, it is necessary to perform appropriate potential
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