Identification of Landslide-prone Areas on the Road Connecting Kaur Regency, Bengkulu Province to South Oku Regency, South Sumatra Province Using the Microtremor Method

Abstract

Muara Sahung District, Kaur Regency, is an area with a high level of landslide disasters. These incidents often cut off the connecting transportation route between Kaur Regency, Bengkulu Province, and South Oku Regency, South Sumatra Province. This research aims to analyze the potential for landslide disasters in this area. We used the Horizontal to Vertical Spectral Ratio (HVSR) technique to analyze microtremors and identify landslide-prone areas in this research. A total of 13 measurement points with a distance of 1–3 km between points are located in Serdang Indah Village, Luas District, Ulak Bandung Village, Bukit Makmur and Sumber Makmur, Muara Sahung District, Kaur Regency, Bengkulu Province. This was carried out using the PASI Gemini-2 portable seismometer device in the Kaur Regency area with hilly contours on the left and right of the road. The analysis results include the amplification factor (A₀), dominant frequency (f₀), and soil vulnerability index (K_g). The results of the analysis and calculations show that the highest landslide risk value among all points is at point (KR-4, KR-5) in Ulak Village, Bandung (KR-7). Bukit Makmur Village and (KR-9) Serdang Indah Village, where this location is on a road with steep hilly contours that often cause landslides.