Site Analysis Using Microtremor Array for Disaster Mitigation of Landslide in the Cianjur Aquatic Resort

¹ Geoscience Research Group, Department of Physics, Universitas Gadjah Mada, Yogyakarta 55281, Indonesia
² Department of Physics, Universitas Gadjah Mada, Yogyakarta 55281, Indonesia
³ Department of Informatics Engineering, Politeknik Harapan Bersama, Tegal 52147, Indonesia
⁴ Meteorology Climatology and Geophysics Agency (BMKG)

^* Corresponding author: ws@ugm.ac.id

Abstract

Micrometer Array measures microwaves from nature and human life by using specific configurations to determine the rock layers below the surface. The purpose of this study was to obtain information on subsurface geological conditions, especially rock layers and the depth of bedrock so that the characteristics of underground rocks and soil conditions can be known as an effort to mitigate landslides in the tourist area of The Cianjur Aquatic Resort. The research method used in this study is the spatial autocorrelation (SPAC) method. The results showed that The Cianjur Aquatic Resort area has a rock layer in the tourist attraction The Cianjur Aquatic Resort, which consists of 2 rock layers with the characteristics of a medium rock layer in the first layer and hard rock in the second layer. The depth of the first layer of rock ranges from 8-10 meters, and the depth of the second layer ranges from 90-100 meters. Judging from the condition of the rock layers, Vs30, and soil conditions as well as the thickness of the rock layers in the area of The Cianjur Aquatic Resort, it is classified as safe from landslides, but it should be noted that landslides occur not only because of the soil, condition or thickness of the coating, but many factors influence it such as the condition of the resort location, weather conditions, slope, and vegetation density.