Identification of Potential Fissure Zone in the Hospitality Area, Yogyakarta, Indonesia Using Microtremor Data

Abstract

In order to increase employment, community income, regional income, state income, and foreign exchange profits, efforts to develop and utilize various tourism potentials are one of the core industries that can drive economic activity, including other connected sector activities. Yogyakarta's various tourism potentials are linked to other tourism accommodations, such as hotel buildings. In December 2019, the number of tourists to Yogyakarta who stayed in hotels reached 9.01 million. Of course, tourists' water requirements are numerous, causing the groundwater level to drop. The reduction of groundwater levels is coupled with sloping topography, which increases the risk of soil fissures in the Yogyakarta city region. Because it is located in the ring of fire, Yogyakarta is vulnerable to earthquakes. Based on microtremor data, the goal of this study was to identify regions prone to earthquake-induced soil fissures caused by excessive groundwater extraction. Geological investigations and microtremor measurements are used in the research. The findings suggest that most of the study region has the potential for soil fracture due to earthquakes, with ground share strain values on the order of 10-4. However, no liquefaction potential because the most significant value of ground share strain is 0.000141.