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All Journal Journal of Science and Applicative Technology International Journal of Hydrological and Environmental for Sustainability Jurnal Geosaintek
Sofiana Herman
Department of Physics, Institut Teknologi Sumatera
Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Engineering Environmental Science Materials Science & Nanotechnology Mechanical Engineering

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SUBSURFACE MODELING FOR IDENTIFYING SLIP SURFACE: USING THE 2D RESISTIVITY METHOD IN PESAWARAN REGENCY Sofiana Herman; Ikah Ning Prasetiowati Permanasari; Tia Anisa; Vico Luthfi Ipmawan
Jurnal Geosaintek Vol. 12 No. 3 (2026)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25023659.v12i3.8108

Abstract

Way Ratai Road in Pesawaran Regency, Lampung Province, is characterized by hilly morphology with steep slopes, rendering the area susceptible to mass movement. To date, no geophysical studies have specifically identified the slip surface zone along this road corridor, making this research essential as a basis for landslide disaster mitigation. This study aims to identify the slip surface with criteria encompassing subsurface layer structure and weak zone depth estimation. Data acquisition was conducted using the dipole-dipole configuration resistivity geoelectrical method with a traverse length of 128 m, employing 33 electrodes at 4 m spacing. Resistivity data inversion modeling was performed using Res2Dinv software. The interpretation results indicate that the subsurface structure of the study area comprises five lithological units, namely clay, gravel, tuff, basite, and quartzite. The slip surface was identified at a depth of 6–21 m, located at the contact zone between the tuff and basalt units, which exhibits significant resistivity contrast. The estimated volume of potential landslide material reaches 34,560 m³. The findings of this research can serve as a reference for structural and non-structural mitigation planning to minimize landslide risk in the Way Ratai Road area.
Imaging Fault Gouge Zones along the Menanga Fault using Integrated Electrical Resistivity and Multi-frequency Ground Penetrating Radar in Pesawaran, Lampung, Indonesia Rahmat Nawi Siregar; Muhammad Ragil Setiawan; Bilal Al Farishi; Ikah Ning P Permanasari; Sofiana Herman; Denny Pratama; Devina Anggraini; Shofiya Nisfatul Laily; Monalisa Devinci Pardosi
International Journal of Hydrological and Environmental for Sustainability Vol. 5 No. 3 (2026): International Journal of Hydrological and Environmental for Sustainability
Publisher : CV FOUNDAE

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58524/ijhes.v5i3.1009

Abstract

Detecting fault gouge zones in poorly exposed fault systems is critical for understanding active deformation. The Menanga fault in Pesawaran (Lampung) revealed its activity during the 2021 swarm earthquake near Mt. Ratai at 1.5-4.5 km depth. Due to the limited exposure of the fault plane, geophysical imaging is applied to delineate subsurface structures. In this work, we conducted three survey lines using integrated geoelectric method and multi-frequency ground penetrating radar (50 MHz, 100 MHz, and 250 MHz) to investigate a clear image of Menanga fault zone. The electrical resistivity profiles revealed lateral discontinuities between relatively high-resistivity blocks separated by lower-to-intermediate resistivity materials, whereas the GPR profiles showed signal attenuation, chaotic radar facies, and discontinuous reflectors associated with structurally disturbed zones. Fault-related deformation zones were characterized by resistivity contrasts relative to adjacent high-resistivity blocks, together with low-amplitude, chaotic, and discontinuous GPR reflections. The clearest anomaly occurs at approximately 96 m offset along Line 1, where the subsurface discontinuity coincides with an exposed fault zone. Line 2 shows multiple fault-related discontinuities, whereas Line 3 exhibits an inferred deformation zone without clear surface exposure. Overall, the integration of electrical resistivity and multi-frequency GPR effectively delineates the shallow architecture of the Menanga Fault and provides geophysical evidence of fault-related deformation consistent with previous seismic and geomorphological studies.
Effect of Azimuthal Variability in Estimation of HVSR Parameters and Ground Shear Strain at Kota Baru, South Lampung, Indonesia Vico Luthfi Ipmawan; Rizqi Prastowo; Mochamad Iqbal; Ikah Ning Prasetiowati Permanasari; Sofiana Herman
Journal of Science and Applicative Technology Vol. 9 No. 1 (2025): Journal of Science and Applicative Technology June Chapter
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LPPM), Institut Teknologi Sumatera, Lampung Selatan, Lampung, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35472/jsat.v9i1.2107

Abstract

Kota Baru, a potential capital of Lampung Province in South Lampung, Indonesia, faces significant earthquake risks due to the Great Sumatran Fault and the Sumatra Megathrust. Geologically, the area is part of the Plio-Pleistocene Lampung Formation, predominantly composed of rhyolite-dacite tuff and volcanoclastic tuff, which can amplify seismic shaking. This study investigates azimuthal variations in the Horizontal-to-Vertical Spectral Ratio (HVSR) across 15 locations in Kota Baru to identify their underlying causes. The results show notable changes in peak amplitude (Ao) and dominant frequency (fo) across different azimuths, with Mean Absolute Deviations (MAD) ranging from 0.96 to 5.71 for Ao and from 0.00 to 1.57 for fo. Maximum HVSR values were predominantly observed at azimuths below 30° across most regions. These variations are likely related to differences in soft layer thickness and/or the presence of a suspected fault near the study area, both of which could influence seismic wave propagation. A model of an 8.9-magnitude megathrust earthquake revealed no significant differences in Ground Shear Strain values, with results remaining within the same Modified Mercalli Intensity (MMI) scale. Therefore, despite azimuthal variability, the assumption of isotropic ambient noise in Kota Baru remains valid.
Co-Authors Bilal Al Farishi Denny Pratama Devina Anggraini Ikah Ning P Permanasari Ikah Ning Prasetiowati Permanasari Ikah Ning Prasetiowati Permanasari Mochamad Iqbal Monalisa Devinci Pardosi Muhammad Ragil Setiawan Rizqi Prastowo Shofiya Nisfatul Laily Siregar, Rahmat Nawi Tia Anisa Vico Luthfi Ipmawan Vico Luthfi Ipmawan