Mataram Fault – New Active Fault Crosses East-West in the Centre of Yogyakarta City

Abstract Yogyakarta has experienced two devastating earthquake disasters: May 26, 2006, Mw6.4, and the penultimate event, June 10, 1867 Mw7.7. The active fault that is thought to be responsible for events Opak Fault. However, Fault still not been thoroughly well mapped yet. lack of a high-resolution image, dense vegetation cover, high sediment flux from Merapi volcano, human activities eroding original landscape challenge studying on-land in this area. Our recent study, however, indicates only can cause major disaster, but another strand exists We using best available data DEMNAS assisted by more detailed DEM Orthophoto, developed drone survey, we also conducted Earth Resistivity Tomography (ERT) survey. found inferred new oriented East-West across center high-populated city. runs parallel close famous Mataram channel (Selokan Mataram). likely continue previously recognized Dengkeng Fault, east fault. indicated morphological lineaments few steam offsets. ERT 2D sections have revealed zone several locations along line. line cut Young Quaternary rocks; hence, it an Further studies are needed get further details newly fault, such as conducting paleoseismological studies, seismological geodetic GPS measurement, acquiring image acquisition survey (LiDAR – Light Detection Ranging Survey).