TECTONIC GEOMORPHOLOGY AND EARTHQUAKE RISK MAP OF BATURAGUNG MOUNTAIN CENTRAL JAVA

• Main Author: MULYASARI (NIM: 22014016), RAHMI
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/30160
• Institution: Institut Teknologi Bandung

<p align="justify">Special Region of Yogyakarta (DIY) and Klaten district, Central Java Province is one of areas in Indonesia that is prone to earthquake caused by subduction in Indian Ocean and active fault in land. Active fault inferred as a source of earthquake in this area is Opak fault in relatively SE –NW direction. Beside that, there is another fault which is expected to contribute southern Klaten damage, ie Dengkeng fault in relatively W-E direction. Dengkeng fault is located north of Baturagung Mountain. This study discusses the existence of Dengkeng fault, tectonic activity, and earthquake risk map of Baturagung Mountain. Method used in this study is tectonic geomorphology with qualitative (morphotectonic) and <br /> <br /> quantitative (morphometric) approaches. Additionally this study conducted an analysis of seismic data and field observations. Morphotectonic analysis includes analysis of lineaments and mountain front. Lineament analysis shows the <br /> <br /> lineament zones in the study area, southeast - northwest, southwest - northeast and west - east. Mountain front analysis indicates fault activity in the area reflected by linear hills and triangular facets in zones A (north) and linear hills in zone B (south). Morphometric analysis was used to identify the relative tectonic activity index (IATR) in Baturagung Mountain consists of 5 parameters, basin asymmetry (AF), hypsometric integral and curve (Hi and Hc), stream length gradient index (SL), basin indices (Bs), and mountain - front sinuosity (Smf). IATR in this area is divided into three classes: Class 2 (high), Class 3 (moderate), and Class 4 (low). Distribution of IATR in 65 subbasins area (207.2 km2) is: about 0.6% of watershed area (1.32 km2) Class 2; 58.9% (122.1 km2) of Class 3; <br /> <br /> and 40.4% (83.75 km2) Class 4. Dengkeng fault is estimated on the north side of Baturagung Mountains, where the fault is reflected by pattern of lineaments, morphotectonic, 2006 earthquake data, and some of morphometric parameters of the moderate class in zone A. Earthquake risk map related to value of IATR Baturagung Mountain (hazard), land use (vulnerability), and capacity, the result corresponds to data of earthquake damage in 2006.<p align="justify">