INTEGRATION OF MICROTREMOR AND CONE PENETRATION TEST (CPT) DATA IN MAPPING LIQUEFACTION POTENTIAL OF THE CANDIDATE NEW CAPITAL REGION OF INDONESIA

• Main Author: Hadi Kusuma, Wira
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/61791
• Institution: Institut Teknologi Bandung

Currently, East Kalimantan has been designated as the new provincial capital of Indonesia. The criteria for determining the relocation of the state capital have passed various studies in the placement of the new state capital, one of which is by reviewing disaster aspects such as the risk of floods, earthquakes, volcanoes and liquefaction. Determination in making a liquefaction hazard map is very important in development planning and for the welfare of the community. This research was conducted in Sepaku District, North Penajam Paser Regency, East Kalimantan Province using microtremor and cone penetration test (CPT) data and seismicity of the study area. To analyze the potential for liquefaction in the study area, empirical and HVSR methods were used. Microtremor data using the Horizontal To Vertical Spectral Ratio (HVSR) method as many as 65 points will be processed to obtain the ground shear strain value using the calculation concept of Nakamura (1997). Meanwhile, the 7 points cone penetration test (CPT) data was processed to produce the liquefaction potential index (LPI) using the Iwasaki (1981) concept. The resulting ground shear strain value is 0.00089 – 0.033. In addition, the LPI value varies from 0 – 11,521. Each data has a very low to high value in the potential for liquefaction. The potential liquefaction hazard was identified at the ground shear strain value, namely 10-2 – 10-1. Meanwhile, the LPI value has the potential for liquefaction, namely 5 < LPI 15. The microzonation map of the resulting liquefaction potential is divided into three zones, namely Zone A, Zone B and Zone C, respectively, producing high liquefaction potential in the north, east southeast - south and there is a small association area to the southwest of the study area.