ANALISIS INDEKS KERENTANAN SEISMIK DENGAN METODE HORIZONTAL TO VERTICAL SPECTRAL RATIO DI WILAYAH DESA KALONGAN KECAMATAN UNGARAN TIMUR KABUPATEN SEMARANG

Intan Desma Safitri, NIM.: 20106020004 (2024) ANALISIS INDEKS KERENTANAN SEISMIK DENGAN METODE HORIZONTAL TO VERTICAL SPECTRAL RATIO DI WILAYAH DESA KALONGAN KECAMATAN UNGARAN TIMUR KABUPATEN SEMARANG. Skripsi thesis, UIN SUNAN KALIJAGA YOGYAKARTA.

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Abstract

This research was conducted in Kalongan Village, Ungaran Timur District, Semarang District. This research aims to determine and analyze amplification factors, dominant frequency, dominant period, and seismic vulnerability index in Kalongan Village. Data acquisition used 103 measurement points with a distance between points of ± 100 meters spread across Kalongan Village, both in landslide zones and residential areas. The research is at the coordinate boundaries -7.13723° to -7.12531° South Latitude and 110.4381316° to 110.444915° East Longitude which is composed of two geological formations, namely the Kerek Formation and the Kaligetas Formation. The microtremor signal data resulting from field data acquisition was processed using the HVSR method to obtain the parameters of the amplification factor (A0) and dominant frequency (f0) and a 2D microzonation modeling map was created. Microzonation is the division of a zone into potential vulnerability to earthquakes. Information on parameters A0 and f0 is limited to the seismic vulnerability index parameter (Kg) with the equation according to Nakamura in 2008. The microzonation value of A0 is in the range 0.77 to 4.75 with low to medium A0 levels, the microzonation value of f0 is in the range 0.27 Hz to 16.10 Hz with soil types I, II, III and IV, and Microzonation Kg values are in the range 0.07 to 18.83. The research area is in a seismic vulnerability index condition with no damage. In the landslide zone area, the seismic vulnerability index is in the range of 0.3 to 12.5.

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