In-situ stress at the northern portion of the Chelungpu fault, Taiwan, estimated on boring cores recovered from a 2-km-deep hole of TCDPReport as inadecuate




In-situ stress at the northern portion of the Chelungpu fault, Taiwan, estimated on boring cores recovered from a 2-km-deep hole of TCDP - Download this document for free, or read online. Document in PDF available to download.

Earth, Planets and Space

, Volume 60, Issue 8, pp 809–819

First Online: 08 September 2008Received: 13 November 2006Revised: 09 July 2007Accepted: 17 May 2008

Abstract

We have investigated the depth variation in the stress state at the northern part of the Chelungpu fault, Taiwan, which slipped during the 1999 Chi-Chi earthquake Mw 7.6. In-situ stress around the fault was estimated based on the stress memory of rocks recovered from five depths 739–1316 m of a 2-km-deep-hole. The borehole intersects a fault zone at a depth of 1111 m FZ1111, which is the best candidate for the Chelungpu fault. Our main results are: 1 the SHmax direction is parallel to the slip for the Chi-Chi earthquake and agrees with those of the local, regional, or tectonic scales estimated from various stress indicators; 2 significant aspects of the stress field are identical to those of paleostress; 3 the horizontal differential stress was significantly reduced just above FZ1111, which may be attributable to the existence of a significantly deformable zone at this depth.

Key words1999 Chi-Chi earthquake Chelungpu fault TCDP crustal stress stress memory core method  Download to read the full article text



Author: Yasuo Yabe - Sheng-Rong Song - Chien-Ying Wang

Source: https://link.springer.com/







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