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Interpretation of Deformation History and Paleostress Based on Fracture Analysis Exposed in a Trench
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  • Journal title : The Journal of Engineering Geology
  • Volume 26, Issue 1,  2016, pp.33-49
  • Publisher : The Korea Society of Engineering Gelolgy
  • DOI : 10.9720/kseg.2016.1.33
 Title & Authors
Interpretation of Deformation History and Paleostress Based on Fracture Analysis Exposed in a Trench
Gwon, Sehyeon; Kim, Young-Seog;
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The study area, located in Sinam-ri, Ulsan, in the southeastern part of the Korean Peninsula, is mainly composed of hornblende granite (ca. 65 Ma). Fracturing and reactivation of a fault striking ENE-WSW was strongly controlled by the intrusion of a mafic dyke (ca. 44 Ma), which behaves as a discontinuity in the mechanically homogeneous pluton, increasing the instability of the basement in this area. A geometric and kinematic study undertaken to interpret the faults and fractures was performed in a trench excavated almost perpendicular to the orientation of the dyke. The analysis of structural elements, such as dykes, veins, and faults, is used to infer the deformation history and to determine the paleostress orientations at the time of formation of the structures. The deformation history established based on this analysis is as follows: (1) NNE-SSW, E-W, ENE-WSW, and NE-SW trending fractures had already developed in the pluton before dyke intrusion; (2) felsic dykes intruded under conditions of σHmax oriented N-S and σHmin oriented E-W; (3) mafic dykes intruded under conditions of σHmax oriented E-W and σHmin oriented N-S; (4) dextral reactivation of the main fault associated with the development of hydrothermal quartz veins under conditions of σHmax oriented E-W and σHmin oriented N-S; (5) sinistral reactivation of the main fault and high-angle normal faults under conditions of σHmax oriented NE-SW and σHmin oriented NW-SE; and (6) dextral reactivation of the main fault and NE-SW low-angle reverse faults under conditions of σHmax oriented NW-SE and σHmin oriented NE-SW. These results are consistent with the tectonic history of the Pohang-Ulsan block in the southeastern part of the Korean Peninsula, and indicates the tectonic deformation of the southern area of the Ulsan fault bounded by Yangsan fault was analogous to that of the Pohang-Ulsan area from the Cenozoic. This work greatly aids the selection of sites for critical facilities to prevent potential earthquake hazards in this area.
fault;fracture;trench;fracture history;paleostress reconstruction;
 Cited by
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Deformation history and characteristics of the Ilgwang Fault in Southeast Korea, Geosciences Journal, 2017  crossref(new windwow)
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