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All Journal International Journal of Hydrological and Environmental for Sustainability
Hartono Hartono
Department of Physics, Universitas Islam Negeri Walisongo Semarang
Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Environmental Science

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Landslide Surface Prediction with Combined HVSR and VES Geophysical Techniques: Case Study in Semarang City, Indonesia Andi Fadlan; Hartono Hartono; Antomi Saregar; Vishal R. Panse; Gaurav Rahate; Anita Shukla
International Journal of Hydrological and Environmental for Sustainability Vol. 3 No. 2 (2024): 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.v3i2.442

Abstract

Abstract. There are settlements in Tambakaji, Semarang City, which are threatened with landslides because they are located right at the foot of the slope, so research is needed to determine the potential for landslides on the slope. Landslide potential can be identified by identifying the presence of slip planes on the slopes and knowing the soil classification. The prediction of the presence of slip planes is done using the resistivity method while the soil classification uses the HVSR method. The HVSR method is also used to determine the depth of the sediment layer to strengthen the suspicion of the existence of a slip plane in the resistivity method. Based on the results of research using the resistivity method, it shows that the slope has the potential for landslides because it is suspected to have a slip plane at a depth of 20-23 meters (reinforced by the results of the HVSR method which obtains a sediment thickness value of about 23.4 -23.8 meters), but the rate of landslides falls into in the low category because the layer of sediment above it is classified as hard soil.
Integrated HVSR Microtremor and Electrical Resistivity Analysis for Identifying Shallow Fluid Migration Pathways in Sangubanyu, Central Java, Indonesia Hartono Hartono; Oscar Kaeni; Jasuri
International Journal of Hydrological and Environmental for Sustainability Vol. 5 No. 3 (2026): [Forthcoming Issue] International Journal of Hydrological and Environmental for
Publisher : CV FOUNDAE

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58524/ijhes.v5i3.1175

Abstract

Surface manifestations of oil seepage and geothermal discharge indicate active subsurface fluid migration, but identifying shallow migration pathways in structurally complex volcanic terrains remains challenging using a single geophysical method. This study investigates shallow fluid migration in the Sangubanyi area, Central Java, Indonesia, through the integrated interpretation of Horizontal-to-Vertical Spectral Ratio (HVSR) microtremor measurements and Schlumberger resistivity sounding. HVSR-derived shear-wave velocity (Vs) models were integrated with resistivity-depth models to constrain subsurface layering and identify geophysical boundaries related to fluid migration. MSB-02 exhibits a dominant frequency of 1.32 Hz with an amplification factor of 4.32. The representative Vs model consists of a low-velocity layer of approximately 380 m/s extending to a depth of about 70 m, underlain by a higher-velocity layer of approximately 1900 m/s. Resistivity models reveal conductive zones of approximately 7–30 Ω·m contrasting with resistive volcanic units exceeding 500 Ω·m. The coincidence between the Vs impedance contrast and the resistivity anomaly is interpreted as a geophysical boundary associated with lithological variation and fault-related deformation. Integrated interpretation suggests that fault- and fracture-related permeability provides the principal vertical pathway for fluid ascent, whereas the more permeable Kaligetas Formation facilitates lateral fluid redistribution, explaining the close spatial association between hot spring manifestations and localized oil seepage. Based on the available near-surface geophysical evidence, the seepage is interpreted as a localized surface expression of structurally controlled shallow fluid migration rather than direct evidence of significant shallow hydrocarbon accumulation.
Co-Authors Andi Fadlan Anita Shukla Antomi Saregar Gaurav Rahate Jasuri Oscar Kaeni Vishal R. Panse