Analysis of Existence and Faults Impact on Geological Disasters Using GGMPlus Data

Abstract

The existence of faults can trigger various geological natural disasters because faults will react when an earthquake occurs and volcanic activity occurs, causing effects in the form of landslides, subsidence, ground movements, and other geological disasters. This research aims to analyze the existence and impact of local faults on geological disasters around the research location using GGMPlus data. A derivative filter is used to get FHD and SVD maps based on the gravity anomaly map. Fault analysis was carried out using a graph from the FHD and SVD map incisions, which were then correlated with each other. The incision graph of the meeting point between the maximum FHD value and the zero SVD value will be interpreted as a fault structure. The results show that there were several fault indication points; these points were then drawn straight lines to get the lineaments of the faults. The fault lineaments with the location of the landslide and subsidence events are correlated so that it becomes evident that the subsidence and landslide disaster in the Brau Hamlet, Batu City, area can be associated with local faults. Based on several previous research on determining faults in coastal areas, it is known that the areas crossed by the Palu-Koro fault have experienced many disasters, such as landslides, land movement and liquefaction. The existence of local faults in an area can increase the impact of damage when natural disasters such as earthquakes and landslides occur.