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Behavioral Characteristics of the Yangsan Fault based on Geometric Analysis of Fault Slip  

Chang, Chun-Joong (Korea Electric Power Research Institute)
Chang, Tae-Woo (Kyungpook National University)
Publication Information
The Journal of Engineering Geology / v.19, no.3, 2009 , pp. 277-285 More about this Journal
Abstract
In order to assess the fault behavior by the geometric analysis of fault slip, the study area between Yangsan city and Shinkwang-myon, Pohang city along the strike of the Yangsan fault is divided into 5 domains($A{\sim}E$ domains) based on the strike change of main fault, the type of fault termination, the cyclic variation of fault zone width, deformation pattern of fault rocks and angular deviation of secondary shears. And, we would apply the relationship between the mode of fault sliding and the resultant deformation texture obtained from previous several experimental studies of simulated fault gouge to the study of the Yangsan fault. To understand sliding behavior of the fault we measured the data of fault attitude and fault slip, and analyzed relationships between the main fault and secondary Riedel shear along the Yangsan fault. The sliding behavioral patterns in each section were analyzed as followings; the straight sections of A, D and E domains were analyzed as the creeping section of stably sliding. In contrast, the curved section of B domain was analyzed as the locked section of stick-slip movement.
Keywords
Yangsan fault; fault behavior; secondary minor fault; fault slip;
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