Abstract
Many inactive fault lineaments developed in Kulon Progo Mountains, which are mainly composed of Oligo-Miocene age (33,9 - 5,3 million years ago) of volcanic rocks. The directions and distributions of the lineaments differ from one part to another. This research was conducted to reveal the fault lineaments on controlling disaster variation of the area. Fault lineaments delineation is done on the area of all Kulon Progo Mountains. Fault lineaments density variation map is made from the fault lineaments. Fault lineaments density variation map that overlaid by slope map will show the result in a relationship between the fault lineaments density and the potential disaster of the area. The result of fault lineaments density analysis shows that high-density values area tend to be landslide and rock slide at the volcanic rocks. High fault lineaments density with relatively low slope percentage has subsidence potential at limestone area in the central part of Kulon Progo mountains. The disaster tends to happen especially in the area of old rock formation with high fault lineaments density.
Highlights
Research area is located in Kulon Progo Mountain, Central Java – Indonesia (Fig. 1.)
The phenomenon of geological structure that develops on the body of the Tertiary age of volcanic rocks can be found in this area
Publication on volcanic geology as well as geological structure in this area has been done by many researchers such as [1,2,3,4,5,6,7,8,9,10,11,12,13,14]
Summary
Research area is located in Kulon Progo Mountain, Central Java – Indonesia (Fig. 1.). Tectonic has controlled the formation of Kulon Progo Mountain [6]. [8] saids that the unique morphology of the Kulon Progo Mountains is caused by the tectonics that has occurred since the Eocene time (56 – 33,9 million years ago). [10] mentions that the fault structure found in the Kulon Progo Mountains are the strike-slip and normal fault. Specific morphological expression of the Kulon Progo Mountain [18] is due to the general trend of tectonics since Eocene time. Thrust faults and strike-slip faults [11] control the distribution of rocks in Kulon Progo Mountains area. Tensional joint, normal fault, thrust fault, strike-slip fault and fold [13] form in Kulon Progo Mountains. Fault develops in the research area is produced by compressional and extensional tectonic phase [14]
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