Opak fault network interacts with Kulonprogo conjugate faults

Abstract

Faults rarely show their bodies as a whole and complete, so that geologists often have difficulties in describing the fault geometry related to the lengths, sizes, orientations, and interaction relationships with each other. Likewise, Opak Fault in Bantul sub-district of Yogyakarta, entirely its main fault body is buried under by the continuing materials deposition of active Merapi Volcano. As the stresses expelled from the tectonic sources propagate through the rock along general orientation. They often leaving the tracks as the strains, perhaps to indicate local stress concentration after a through going fault, which may also occur to accommodate variations along a zone of main fault or its Principal Displacement Zone (PDZ). The aim of this research is to determine network of Opak Fault interaction and relationships with its conjugate faults and their subsidiary fractures. Independent mapping data sets were recorded from fractures population within distinct topography. To reconstruct fault interaction systems integrated with straining track, kinematic, displacements slip sense and geometry relationships. That is intended to draw inference regarding deformation events and fault network systems. That require determining in terms of such, 1) Fractures characteristic. 2) Subsidiary faults position (geometrical connected). 3) Kinematic expressions within each subsidiary faults. 3) Behavior of motion sense indicated by secondary faults. 4) Measuring angles developed. Using morphotectonic mapping method based on imagery and field observations, in establishing a framework to lead during evaluation fault interactions characteristic.The result presents faults network formation and the way of crosscutting relationship, mutual abutment between sub parallel antithetic faults sets, and Kajaran-Progo synthetic fault (KPF) in Kulonprogo, indicate that arrangement of these antithetic faults sets show active dominant behavior. Although antithetic faults usually, behave passively.