MAPPING OF LAND SUBSIDENCE DUE TO TECTONIC FACTORS IN INDONESIAN REGION

• Main Author: Arya Bimantoro, Titus
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/73736
• Institution: Institut Teknologi Bandung

Tectonically, Indonesia is located in the confluence zone of three major tectonic plates, this has several direct impacts geologically. The meeting between the Eurasian Plate and the Australian Plate causes the interaction that is associated with this research is subduction. Subduction is a form of interaction from the meeting of two plates that causes changes or deformations on the earth's surface. The form of vertical deformation caused by plate interactions is tectonic subsidence which can occur in certain areas and is regional in nature. Indonesia is a location that is affected by the interaction between plates, therefore information about plate activity can be used in disaster mitigation. Tectonic subsidence events can be observed and calculated using time-series data from CORS stations spread throughout Indonesia. The time-series data for each CORS varies in terms of temporality which is then extracted to get the up component. Ideally CORS stations are placed in areas with hard rock characteristics so that they are stable and the rate of movement can represent tectonic subsidence. Seeing that there is a lot of tectonic activity in Indonesia, this causes the CORS station to experience vertical movement in millimeter fractions. The vertical movement rate of the CORS station can be observed and measured based on the up component time-series data. Based on these observational data, a tectonic subsidence mapping will be carried out in Indonesian territory and the rate of movement of each region will be carried out. This study provides a visualization of tectonic subsidence in areas along the north coast of Java experiencing land subsidence with values ranging from 3.9x10-3 to 1.1x10-3 meters per year. One of the factors causing land subsidence in a tectonic context is that several regions in Indonesia are the center of the confluence of several world plates and there is tectonic activity in the form of plate shifts, fault shifts, and volcanic activity.