Comparison of Vs30 Value from Microtremor Data Based on SPT Drill Test of Young Merapi Deposits in Opak River, Yogyakarta

Adelia Saras Nugraheni; Agung Setianto; Hendy  Setiawan

doi:10.23960/jgrs.ft.unila.304

Adelia Saras Nugraheni Department of Geological Engineering, Gadjah Mada University
Agung Setianto Department of Geological Engineering, Gadjah Mada University
Hendy Setiawan Department of Geological Engineering, Gadjah Mada University

DOI: https://doi.org/10.23960/jgrs.ft.unila.304

Keywords: Earthquake, Microtremor, Lithology SPT, HVSR Inversion, Vs30

Abstract

The 2006 Yogyakarta earthquake was caused by the tectonic movement of the Opak Fault, which is located near the Opak River. This research conducts microtremor data processing and analysis using the Horizontal Vertical Spectral Ratio (HVSR) method and the Inversion method to determine dominant frequency (fo), amplification (Ao), and shear wave velocity to a depth of 30 meters (Vs₃₀) in Opak River area as an effort in earthquake disaster mitigation. The purpose of this research is to compare the Vs₃₀ value of the inversion method using layer parameters according to Standard Penetration Test (SPT) data from previous research and layer parameters according to the number of lithologies. The result presents that the Vs₃₀ values around Opak River are in the range of 183 - 301 m/s and belong to the stiff soil site classification. The comparison shows that the Vs₃₀ values in the two different layer parameters are both still in the stiff soil site classification and have a slight difference in Vs₃₀ values. Thus, the use of microseismic data to determine the Vs₃₀ value is a fast and efficient way to determine the subsurface geology of the study area.

Author Biographies

Agung Setianto, Department of Geological Engineering, Gadjah Mada University

Program Studi Magister Teknik Geologi, Universitas Gadjah Mada, Jl. Grafika No.2, Sendowo, Sinduadi, Kec. Mlati, Kabupaten Sleman, Daerah Istimewa Yogyakarta 55281

Hendy Setiawan, Department of Geological Engineering, Gadjah Mada University

Program Studi Magister Teknik Geologi, Universitas Gadjah Mada, Jl. Grafika No.2, Sendowo, Sinduadi, Kec. Mlati, Kabupaten Sleman, Daerah Istimewa Yogyakarta 55281

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