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Crustal Stress State and Seismic Hazard along Southwest Segment of the longmenshan thrust belt after Wenchuan Earthquake

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Journal of Earth Science 2014年第4期25卷 676-688页

作者： Xianghui Qin Chengxuan Tan Qunce Chen Manlu Wu Chengjun Feng Institute of Geomechanics Chinese Academy of Geological Sciences Key Laboratory of Neotectonic Movement & Geohazard Ministry of Land and Resources

The crustal stress and seismic hazard estimation along the southwest segment of the longmenshan thrust belt after the Wenchuan Earthquake was conducted by hydraulic fracturing for in-situ stress measurements in four boreholes at the Ridi, Wasigou, Dahegou, and Baoxing sites in 2003, 2008, and 2010. The data reveals relatively high crustal stresses in the Kangding region （Ridi, Wasigou, and Dahegou sites） before and after the Wenchuan Earthquake, while the stresses were relatively low in the short time after the earthquake. The crustal stress in the southwest of the longmenshan thrust belt, especially in the Kangding region, may not have been totally released during the earthquake, and has since increased. Furthermore, the Coulomb failure criterion and Byerlee＇s law are adopted to analyzed in-situ stress data and its implications for fault activity along the southwest segment. The magnitudes of in-situ stresses are still close to or exceed the expected lower bound for fault activity, revealing that the studied region is likely to be active in the future. From the conclusions drawn from our and other methods, the southwest segment of the longmenshan thrust belt, especially the Baoxing region, may present a future seismic hazard.

关键词： Wenchuan Earthquake longmenshan thrust belt in-situ stress measurement crustal stress state Coulomb failure criterion seismic hazard.

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The Uplift of the longmenshan thrust belt and Subsidence of the West Sichuan Foreland Basin

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Acta Geologica Sinica(English Edition) 1996年第1期70卷 16-26页

作者： Liu Shugen, Luo Zhili, Dai Sulan, Changlu Institute of Technology, Chengdu, Sichuan, ChinaDennis Arne Dalhousie U niversity, Canadaand C.J.L. Wilson Melbourne U niversity, Australia Jiang M inxi

Based on fission track dating of apatite, and measurement of vitrinite reflectance of rock samples from the longmenshan (Longmen Mountain)area and the West Sichuan foreland basin and computer modelling it is concluded that (l)the Songpan-Garze fold belt has uplifted at least by 3-4 km with an uplift rate of no less than 0.3-0.4 mm/a since 10 Ma B.P.; (2) the longmenshan thrust nappe belt has uplifted at least by 5-6 km with an uplift rate of more than 0.5- 0.6 mm /a since 10 Ma B.P.; (3) the longmenshan detachment belt has uplifted by 1 - 2 km at a rate of 0.016-0.032 mm/a since 60 Ma B.P.; (4) the West Sichuan foreland basin has uplifted by 1.7-3 km at a rate of 0.028-0.05 mm/a since 60 Ma B.P.; (5) the uplift rate of the area on the west side of the Beichuan-Yingxiu-Xiaoguanzi fault for the last 10 Ma is 40 times as much as that on its east side; (6) the uplifting of the the Songpan - Garze fold belt and the subsidence of the West Sichuan foreland basin 60 Ma ago exhibit a mirro-image correlation, i.e. the rapid uplifting of the the Songpan-Garze fold belt was corresponding to the rapid subsidence of the basin;the Songpan-Garze fold belt has uplifted at a much greater rate than the West Sichuan foeland basin in the last 60 Ma;and (7) the palaeogeothermal gradient was 25℃ /km in the West Sichuan foreland basin.

关键词： fission track uplift (subsidence) history basin modelling longmenshan thrust belt West Sichuan foreland basin

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