Estimation of landslide prone zones around the Semarang Fault based on by combining the slope stability analysis and HVSR microtremor methods. Issue 1 (July 2021)

• Record Type: Journal Article
• Authors: Irham, M N; Yulianto, T; Yuliyanto, G; Widada, S
• Is Part Of: Journal of physics. Volume 1943:Issue 1(2021)
• Publication Date: 2021-07
• Subjects: Physics -- Congresses; 530.5
• DOI: 10.1088/1742-6596/1943/1/012032
• Languages: English
• ISSNs: 1742-6588

Abstract

Abstract: Morphologically the City of Semarang consists of Downtown and Uptown Semarang. Downtown Semarang which is composed of alluvial deposits and sandstone of the Damar Formation. Uptown Semarang composed of conglomerate of the Damar Formation, claystone of the Kalibiuk Formation, volcanic breccia of the Kaligetas Formation, volcanic breccia of Ungaran Volcano, Andesite igneous rock, and Basalt igneous rocks. Upper Semarang is hilly, some of which have steep slopes, especially on the Semarang Fault Zone. This condition makes the area frequent landslides. To find out the zone that is prone to landslides in the area around the Semarang Fault, slope stability analysis and microtremor measurements were performed. Slope stability analysis was carried out at 7 points using the bishop method based on slope, specific gravity, internal shear angle and soil cohesion. The acquisition by microtremor method was carried out at 9 trajectories that were estimated to pass through the Semarang Fault, then from the Horizontal to Vertival Spectral Ratio (HVSR) curves obtained was carried out an inversion to obtain the shear wave velocity profile on the trajectory. From the two methods of analysis found several locations with potential landslides, namely in the area of Mangun Harjo in the east of the study area, Karangrejo in the middle of the study area and Sadeng in the west of the study area.