Rahmawati Fitrianingtyas, Eko Wibowo, Wrego Seno Giamboro, Fauzan Abiyyu Pratama, Khafidh Nur Aziz
Seismic Refraction Tomography (SRT) is a geophysical technique that can be used to characterize the sub-surface of landslide-prone areas. The purpose of this study is to delineate the weathered layer and determine the type of lithology. This research uses the Pasi Gea-24 instrument, which is equipped with 24 geophones arranged in a distance of 46 meters. In processing the data, we used Refrapy which consists of two modules, Refrapick and Refrainv. Refrapick was used to pick the first break in each seismic trace. Meanwhile, Refrainv was used to run a time-terms and a travel times tomography inversion. The results of SRT method depict the two-dimensional variation in seismic wave of sub-surface velocities. The upper layer, with a depth of approximately 3.35 meters and low seismic velocities (100 - 190 m/s), indicates a weathered and unconsolidated soil layer. Beneath this, a denser tuff layer (190 - 610 m/s) and an andesite breccia layer (610 - 1080 m/s) were identified. The significant variation in seismic wave velocities between these lithological types creates a boundary that may indicate the presence of a slip plane, suggesting the soil in this area is susceptible to landslides. © Published under licence by IOP Publishing Ltd.
Geophysical Engineering Department, Faculty of Mineral and Energy Technology Energy, UPN Veteran Yogyakarta, Sleman, Daerah Istimewa, Yogyakarta, Indonesia; Physics Education Department, Faculty of Mathematics and Natural Sciences, Universitas Negeri Yogyakarta, Sleman, Daerah Istimewa, Yogyakarta, Indonesia
