Core description and characteristics of fault zones from Hole-A of the Taiwan Chelungpu-Fault Drilling Project
Journal
Terrestrial, Atmospheric and Oceanic Sciences
Journal Volume
18
Journal Issue
2
Pages
327-357
Date Issued
2007
Author(s)
Yeh, E.-C.
Abstract
and sense of shear, they are categorized as thrust (105/30), left-lateral fault (015/30 -80), right-lateral fault (195/30 -80), normal fault (105/5 -10), and backthrust (285/40 -50). Ten fault zones have been recognized between 500 and 2003 m. We interpret the fault zone located at around 1111 m as being the most likely candidate for rupture deformation during Chi-Chi earthquake. The fault zone seated around 1712 m is recognized as the Sanyi fault zone which is 600 m beneath the Chelungpu fault zone. Ten fault zones including thrust faults, strike-slip faults and backthrust are classified as the Chelungpu Fault System (1500 m). According to the deformation textures within fault zones, the fault zones can be categorized as three types of deformation: distinct fracture deformation, clayey-gouge deformation, and soft-rock deformation. Fracture deformation is dominant within the Chelungpu Fault System and abother two architectures prevail in the Sanyi Fault System. The fracture deformation pattern is asymmetric, which depended the shear sense of fault zone. From the core examination of TCDP Hole-A, the lithology plays an important role in controlling the location and deformation of fault zones.
Type
journal article