Abstract
Ponorogo district morphology form consisting of highlands and hills make this area vulnerable to landslides. Based on the BNPB (National Disaster Management Agency) data from 2013 to 2017, 77 landslides and 35% have occurred in Ngrayun and Slahung sub-districts. One area that has the potential to experience landslides is Tugurejo village in Slahung District. This study aims to determine the physical properties of subsurface rocks using SRT (Seismic Refraction Tomography) and MASW (Multi-channel Analysis of Surface Waves). The seismic velocity distribution defined from the SRT and MASW at the study sites shows a zone with a higher porosity that is interpreted to represent the level and depth of rock mass movement. P-wave velocity and S-wave indicates very low velocity of 500 – 1200 m/s and 100 – 250 m/s at depths up to 5 m .
Highlights
Ponorogo district morphology form consisting of highlands and hills make this area vulnerable to landslides
Based on data from the BNPB (National Disaster Management Agency), from 2013 to 2017 there have been 77 landslide events and 35% of them occurred in Ngrayun and Slahung sub-districts
According to [2] in the context of landslide characterization, tomographic refractive seismic is most often applied because the P-wave seismic velocity usually shows significant differences between landslides and underlying bedrock
Summary
Ponorogo district morphology form consisting of highlands and hills make this area vulnerable to landslides. Landslide analysis is carried out based on the physical properties of rock in the landslide with the surrounding rock which is more stable This difference is influenced by several factors such as deformation, fractures, water content, and porosity [3]. E-mail: This research includes the analysis of geophysical measurements by using refraction seismic method and MASW to determine the vertical and lateral limits of a landslide in Tugurejo. Based on the calculation of the height difference and slope on the topographic map in the study area, Tugurejo is included in the category of strong corrugated geomorphology units. This geomorphological unit is composed of lithology in the form of lapilli and andesite lava. The primary factor that controls the geomorphology unit in this area is an intensive denudational or undergoes weathering and erosional processes which results in the bedrock being exposed well
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