ANALISIS KETEBALAN LAPISAN SEDIMEN DAN BIDANG GELINCIR PADA ZONA LONGSOR DENGAN METODE MIKROTREMOR DI DESA KALONGAN, UNGARAN TIMUR, SEMARANG

Shendy Wijaya, NIM.: 19106020034 (2023) ANALISIS KETEBALAN LAPISAN SEDIMEN DAN BIDANG GELINCIR PADA ZONA LONGSOR DENGAN METODE MIKROTREMOR DI DESA KALONGAN, UNGARAN TIMUR, SEMARANG. Skripsi thesis, UIN SUNAN KALIJAGA YOGYAKARTA.

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Abstract

The research was conducted in the landslide zone area in Kalongan Village, East Ungaran District, Semarang Regency. This research aims to analyze the thickness of the sediment layer and the presence of slip areas. The research was carried out using the microtremor method to obtain an H/V curve for analysis regarding sediment layers and bedrock as a slip surface. Microtremor signal data was collected at 63 measurement points at 100 m intervals in the Kaligetas Formation (Qpkg) and Kerek Formation (Tmk). Data collection is limited to coordinates 110o26'14.694" East Longitude to 110o26'45.704" East Longitude and 7o06'45.983" South Latitude to. 7o08’4.866” LS. The data in the form of microtremor signals is then processed using Geopsy software to obtain an H/V curve which states the fo and Ao values. This curve becomes input for processing the ellipticity curve method with Dinver software so that a ground profile is obtained which states the value of the shear wave velocity (Vs) and the depth or thickness of the sediment layer (H) so that an analysis related to the thickness of the sediment layer and the slip surface is produced. The results of this study show that the fo value in the landslide zone ranges from 1.39 Hz to. 5.84 Hz, Ao values range from 1.39 to 1.39 s.d. 8.47, and sediment thickness (H) values ranged from 6.1 m to 28.0 m. In the landslide zone there is a concave bedrock layer with a length of approximately 158.98 m and a depth of 28.0 m.

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