Study of Slope Stability Using Seismic Refraction Method in Hilly Terrain of Dlingo, Bantul, Yogyakarta
Rahmawati Fitrianingtyas (1*), Eko Wibowo (1), Thema Arrisaldi (2), Muhammad Fadeli Saputra (1), Yustisio Dianwiyono (1)

1) Geophysical Engineering Department, Faculty of Mineral Technology, UPN Veteran Yogyakarta, No.104, Condong Catur, Sleman, Daerah Istimewa Yogyakarta, 55281
2) Department of Geological Engineering, Faculty of Mineral Technology, Universitas Pembangunan Nasional ^Veteran^ Yogyakarta, Jl. Padjajaran, Sleman, Yogyakarta, 55283, Indonesia
*rahmawati.fitrianingtyas[at]upnyk.ac.id

Abstract

This research aims to identify slope stability in hilly terrain based on subsurface formation using refraction seismic method. Measurements were taken at two locations using 24 geophones spaced 2 meters apart, resulting in a total line span of 48 meters at each location. The seismic refraction data processing techniques used in this study is time-term method. This methods was used to analyse the time-distance curve to obtain the velocity model. Based on the velocity distribution of the subsurface seismic waves, there are two distinct layers. The upper layer has a velocity of about 300 m/s, interpreted as unconsolidated soil, which is loose rock that are less dense. The lower layer, with a velocity of 800 m/s - 1764 m/s, is identified as denser rock such as andesite breccia. The upper layer with low velocity indicates a weak zone that is vulnerable to landslides, especially if triggered by heavy rainfall or seismic activity.

Keywords: Slope stability- Landslide- Seismic- Refraction- Yogyakarta

Topic: Engineering