STUDY OF PYROCLASTIC BRECCIA WEATHERING IN PRENDENGAN VILLAGE, PAWINIHAN MOUNTAIN, BANJARMANGU, BANJARNEGARA

Abstract

The lithology of pyroclastic breccia is the lithology that forms the basis of the rock in the Pawinihan mountain landslide that occurred in 2006. This landslide resulted in a large number of victims, more than 80 people died. The landslide occurred in the weathering of the Rogojembangan pyroclastic breccia rock in Banjarnegara Regency. So to find out the weathering factors that affect landslides, a study was carried out on the degree of weathering of pyroclastic breccias. The degree of weathering of pyroclastic breccias plays an important role in supporting the occurrence of landslides because the slip surface is at the degree of weathering. The method used is the identification of the level of weathering with the standard British method for heterogeneous materials. The result obtained is that there is a weathering degree of one to six that can be observed in the field. And the slip surface occurs at weathering levels 3 and 4, so that this weathering level is used as the limit of the slip surface for landslides in pyroclastic breccias.