ANALISIS MORFOTEKTONIK SESAR OPAK SEBAGAI APLIKASI MITIGASI BENCANA GEMPA BUMI YOGYAKARTA

Abstract

The Special Region of Yogyakarta is an area with tectonic activity marked by earthquake. The tectonic activity is caused by the collision of Indo-Australian plate and Eurasian plate that occurs in the southern part of the island of Java. The 2006 earthquake that occurred in the Special Region of Yogyakarta and was the most destructive is thought to have been caused by the Opak Fault which experienced relative north-south shift. Further research on the activities of Opak Fault is needed to design appropriate mitigation measures to minimize the negative impacts that will be caused. The method used in this study is morphotectonic analysis to predict tectonic
activity by performing calculations and image analysis. Calculations and data processing by calculating the value of the Valley Floor, sinuosity mountain floor, and velocity shear 30 using Global Mapper, Arcgis, and Microsoft Excel software. Digital elevation model (DEM) images, google earth images, vs30 maps and shapefile data for the districts of Bantul, Kulonprogo, Yogyakarta, Klaten and Gunungkidul as regional geological maps were used as primary data for the analysis. The result, geological structures and earthquakes contribute actively in shaping the appearance of area where there are active faults. The assessed morphotectonic analysis is method that is assessed and assesses the effectiveness of failure through a geomorphological approach. The research area,
namely the Pleret and Segoroyoso areas, is included in area that has a high level of seismicity that causes alertness and appropriate mitigation measures against earthquake reactivation that can occur and trigger earthquakes again.