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The Northern End of the xiannvshan fault at the Three Gorges Area

Earthquake Research in China 2012年第4期26卷 457-466页

作者： Bi Minfeng Chu Quanzhi Deng Zhihui Pan Bo Zhang Changhou Zhou Qing Institute of Geology China Earthquake Administration China University of Geosciences China Earthquake Networks Center

The xiannvshan fault zone, lying along the western margin of the Huangling anticline, is one of the most important fault zones in the Three Gorges reservoir area. The fault experienced strong activity during the Cenozoic Era. The question of whether the fault zone goes through the Yangtze River has been one of the key problems faced in previous studies as it has a significant influence upon the assessment of geological hazards and earthquake stability in the reservoir area. Based on tectonic and geomorphic observations along the fault zone between the Baixianchi village in Changyang county and Huangkou village in Zigui town, together with the comparisons between the geology in Guizhou and Quyuan town in the north bank of the Yangtze River and the xiannvshan fault zone, it is suggested that the north end of this fault zone is located around Huangkou village and does not go through the Yangtze rivers northward. The evidence is as follows: ① On the basis of field data collection, it is found that the xiannvshan fault zone, which stretches 80km, underwent thrust movement in the Cenozoic period, resulting in ravines and fault scarps, topographically. Whereas, on the northern bank of the Yangtze River, faults are rarely found, and most of the faults are developed in the Jurassic strata,without topographical effects. Therefore, the xiannvshan fault zone has not stretched to the north bank of the Yangtze River. ② The fault gouge and tectonite zone were found developed on the xiannvshan fault zone at Baixianchi village, but only a tectonite zone was found at Zhouping village. There are also some branch faults close to the northern end of the fault zone. So, the activity of the fault zone weakened from south to north in Cenozoic. The fault zone extends northward and dies out at Huangkou. It doesn't stretch forward any longer as indicated by continuous strata, sparse joints, and small folds, etc.

关键词： Three Gorges Area xiannvshan fault Tectonic landform

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The M_S 4.1 Reservoir-induced Hujiaping Earthquake in the Yangtze Three Gorges Reservoir Region

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Earthquake Research in China 2010年第3期24卷 304-319页

作者： Che Yongtai Chen Junhua Zhang Lifen Yu Jinzi Liu Chenglong Zhang Weihua Institute of Geology China Earthquake Administration Beijing 100029 China Earthquake Administration of Hubei Province Wuhan 430071 China

In this paper,based on the collected data and earthquake field investigation,characteristics of the MS4.1 Hujiaping earthquake of November 22,2008 at Guizhou town in Zigui county,Hubei Province and the geological and hydrogeological conditions and seismicity background of the area are analyzed,and the earthquake disaster is presented. Some scientific issues relating to earthquake precursors and the cause of the earthquake is discussed. The authors consider that the earthquake is a tectonic type reservoir-induced earthquake,occurring along the xiannvshan fault under the joint action of reservoir water loading and water infiltration,and that there were certain suspected anomalies appearing in the gravity field before the earthquake. The cause of the earthquake may also be related to the effect of the Wenchuan earthquake on the local stress field.

关键词： Yangtze Three Gorges xiannvshan fault Reservoir-induced earthquake TheMs4. 1 Hujiaping earthquake

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