MAPPING OF SOIL DYNAMIC RESPONSE AND DETERMINATION OF SUBSURFACE STRUCTURE OF PALU CITY BASED ON HORIZONTAL TO VERTICAL SPECTRAL RATIO (HVSR) METHOD

• Main Author: Salma Salsabila, Rifa
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/70413
• Institution: Institut Teknologi Bandung

Palu is one of the earthquake disaster-prone cities in Indonesia. Fisiographycally Palu region is a basin, it is characterized by a wide topography of sunken plains and surrounded by morphology of hills. Based on its tectonic setting, geological conditions and the existence of local faults, the Palu region is an area with a quite high earthquake potential. The mechanism of fault movement is one of the causes of earthquakes in the Palu region. Based on these conditions the infrastructure development and also increasing of the population as a basis consideration for the study of engineering and mitigation to anticipate and reduce the impact of earthquake disasters. The geophysical method that will be used in this study is the HVSR (Horizontal to Vertical Spectral Ratio) method. This method is used to determine the dynamic parameters of the soil such as the dominant frequency (fo), the amplification value H/V (A), and the seismic vulnerability index (kg). These parameters are then presented in a microzonation map that shows the dynamic characteristics of soil beneath the palu region. Furthermore, based on these obtained data will be inverted to get a shear wave velocity model (Vs) to investigate the thickness of the soft layer and the value of average the shear velocity up to 30 m (Vs30) that will be used for site classification, based on these parameters we can analyze the subsurface structure of the Palu area and its dynamic characteristics