龙门山断裂带西南段现今地应力状态与地震危险性分析
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摘要
为了解汶川地震后龙门山断裂西南段现今地应力环境与地震发展趋势,对比分析2003,2008和2010年在宝兴、康定地区4个钻孔的水压致裂应力测量资料,初步揭示汶川地震后断裂西南段现今地应力环境与地震危险性。研究结果表明:龙门山断裂西南段,尤其是康定地区,地震后仍然积累有较高的地应力,震后应力调整以积累为主;龙门山断裂西南端的最大水平主应力已经达到断层活动应力临界下限值,断裂活动进入临界状态,未来具有发生逆断层活动的可能性;结合地应力测量结果、地震地质等资料认为,龙门山断裂西南端具有潜在大震危险性,值得重点关注和研究。研究成果对于龙门山西南段断裂活动性分析、地应力长期监测以及防灾减灾有重要意义。
Results of geostress measured respectively in 2003,2008 and 2010 in four boreholes located in Baoxing County and Kangding district in Sichuan Province,together with seismic geological data,were used to study the geostress state and seismic risk in Southern segment of Longmenshan fracture belt after Wenchuan Ms 8.0 earthquake.The study results show that the present stress conditions do not appear to be totally relieved after the region tectonic stress field adjustment caused by Wenchuan earthquake,and the adjustment tendency of geostress is accumulated after Wenchuan earthquake in this region.Primary analysis reflects that the maximum horizontal principal stress values have reached the lower limit of fault activity in the Southwest segment of Longmenshan fracture belt.The fault has been in critical state and will probably slip in the way of reverse fault in the future.Based on the measured geostress state and earthquake migration data,there is a potential seismic risk in the Southwest segment of Longmenshan fracture belt.It is suggested that more attention should be paid to this region.The research results have great significance for mobility analysis of fracture,long-term monitoring of geostresses and disaster prevention and mitigation in the Southwest segment of Longmenshan fracture belt.
引文
[1]谢富仁,邱泽华,王勇,等.我国地应力观测与地震预报[J].国际地震动态,2005,(5):54–59.(XIE Furen,QIU Zehua,WANGYong,et al.Earth stress observation and earthquake prediction[J].Recent Developments in World Seismology,2005,(5):54–59.(inChinese))
    [2]LIAO C T,ZHANG C S,WU M L,et al.Stress change near theKunlun fault before and after the Ms8.1 Kunlun earthquake[J].Geophysical Research Letters,2003,27(20):2027,doi:10.1029/2003GL018106..
    [3]郭啓良,王成虎,马洪生,等.汶川MS8.0级大震前后的水压致裂原地应力测量[J].地球物理学报,2009,52(5):1395–1401.(GUOQiliang,WANG Chenghu,MA Hongsheng,et al.In-situ hydro-fracture stress measurement before and after the Wenchuan MS8.0earthquake of China[J].Chinese Journal of Geophysics,2009,52(5):1 395–1 401.(in Chinese))
    [4]华卫,陈章立,李志雄,等.汶川8.0级地震触发与余震活动空间分布研究[J].地震,2009,29(1):33–39.(HUA Wei,CHENZhangli,LI Zhixiong,et al.Seismic triggering and aftershock distributionof the Wenchuan M8.0 earthquake[J].Earthquake,2009,29(1):33–39.(in Chinese))
    [5]郑勇,马宏生,吕坚,等.汶川地震强余震(MS≥5.6)的震源机制解及其与发震构造的关系[J].中国科学:D辑,2009,39(4):413–426.(ZHENG Yong,MA Hongsheng,LU Jian,et al.Source mechanismof strong aftershocks(MS≥5.6)of the 5.12 Wenchuan earthquake andthe implication for seismotectonics[J].Science in China:Series D,2009,39(4):413–426.(in Chinese))
    [6]单斌,熊熊,郑勇,等.2008年5月12日Mw7.9汶川地震导致的周边断层应力变化[J].中国科学:D辑,2009,39(5):537–545.(SHAN Bin,XIONG Xiong,ZHENG Yong,et al.Stress changes onmajor faults caused by Mw7.9 Wenchuan earthquake,May 12,2008[J].Science in China:Series D,2009,52(5):537–545.(in Chinese))
    [7]邵志刚,周龙泉,蒋长胜,等.2008年汶川MS8.0地震对周边断层地震活动的影响[J].地球物理学报,2010,53(8):1784–1795.(SHAOZhigang,ZHOU Longquan,JIANG Changsheng,et al.The impact ofWenchuan MS8.0 earthquake on the seismic activity of surroundingfaults[J].Chinese Journal of Geophysics,2010,53(8):1 784–1 795.(inChinese))
    [8]万永革,沈正康,盛书中,等.2008年汶川地震对周围断层的影响[J].地震学报,2009,31(2):128–139.(WAN Yongge,SHENZhengkang,SHENG Shuzhong,et al.The influence of 2008 Wenchuanearthquake on surrounding faults[J].Acta Seismologica Sinica,2009,31(2):128–139.(in Chinese))
    [9]国家地震局《中国岩石圈动力学地图集》编委会.中国岩石圈动力学地图集[M].北京:中国地图出版社,1989:48–50.(EditorialCommittee for Lithospheric Dynamics Atlas of China,StateSeismological Bureau.Lithospheric dynamics atlas of China[M].Beijing:Sino Maps Press,1989:48–50.(in Chinese))
    [10]唐荣昌,韩渭宾.四川活动断裂与地震[M].北京:地震出版社,1993.(TANG Rongchang,HAN Weibin.Active faults and earthquakesin Sichuan province[M].Beijing:Earthquake Press,1993.(in Chinese))
    [11]唐文清,刘宇平,陈智梁,等.龙门山断裂构造带GPS研究[J].大地测量与地球动力学,2004,24(3):57–60.(TANG Wenqing,LIUYuping,CHEN Zhiliang,et al.GPS study on Longmenshan faultzone[J].Journal of Geodesy and Geodynamics,2004,24(3):57–60.(in Chinese))
    [12]李智武,刘树根,陈洪德,等.龙门山冲断带分段–分带性构造格局及其差异变形特征[J].成都理工大学学报:自然科学版,2008,35(4):440–453.(LI Zhiwu,LIU Shugen,CHEN Hongde,et al.Structural segmentation and zonation and differential across and alongthe Longmen thrust belt,West Sichuan,China[J].Journal of ChengduUniversity of Technology:Science and Technology,2008,35(4):440–453.(in Chinese))
    [13]徐锡伟,闻学泽,郑荣章,等.川滇地区活动块体最新构造变动样式及其动力来源[J].中国科学:D辑,2003,33(增):151–161.(XUXiwei,WEN Xueze,ZHENG Rongzhang,et al.Pattern of latesttectonic motion and its dynamics for active blocks in Sichuan—Yunnan Region,China[J].Science in China:Series D,2003,33(Supp.):151–161.(in Chinese))
    [14]冉勇康,陈立春,程建武,等.安宁河断裂冕宁以北晚第四纪地表变形与强震破裂行为[J].中国科学:D辑,2008,38(5):543–554.(RAN Yongkang,CHEN Lichun,CHENG Jianwu,et al.LateQuaternary surface deformation and rupture behavior of strongearthquake on the segment north of Mianning of the Anninghe fault[J].Science in China:Series D,2008,38(5):543–554.(in Chinese))
    [15]HAIMSON B C,CORNET F H.ISRM suggested methods for rockstress estimation—part 3:hydraulic fracturing(HF)and/or hydraulictesting of pre-existing fractures(HTPF)[J].International Journal ofRock Mechanics and Mining Sciences,2003,40(7):1 011–1 020.
    [16]中国地震局地壳应力研究所.小天都水电站大河沟ZK1号钻孔水压致裂地应力测量报告[R].北京:中国地震局地壳应力研究所,2003.(Institute of Crustal Dynamics,China Earthquake Administration.Hydro-fracture in-situ stress measurements in ZK1 borehole inXiaotiandu hydropower station[R].Beijing:Institute of Crustal Dynamics,China Earthquake Administration,2003.(in Chinese))
    [17]陈彭年,陈宏德,高莉青.世界地应力实测资料汇编[M].北京:地震出版社,1990:7–11.(CHEN Pengnian,CHEN Hongde,GAOLiqing.Assembly of measured in-situ stress in world[M].Beijing:Earthquake Press,1990:7–11.(in Chinese))
    [18]ZOBACK M D,HEALY J H.In-situ stress measurements to 3.5 kmdepth in the Cajon pass scientific research borehole:Implications forthe mechanics of crustal faulting[J].Journal of Geophysical Research,1992,97(B4):5 039–5 057.
    [19]苏恺之,李方全,张伯崇,等.长江三峡坝区地壳应力与孔隙水压力综合研究[M].北京:地震出版社,1996:151–165.(SU Kaizhi,LI Fangquan,ZHANG Bochong,et al.Integrated research on thecrustal stress and pore water pressure at the dam site of the ThreeGorges[M].Beijing:Earthquake Press,1996:151–165.(in Chinese))
    [20]BYERLEE J.Friction of rocks[J].Pure and Applied Geophysis,1978,116(4/5):615–626.
    [21]陈群策,安其美,孙东生,等.山西盆地现今地应力状态与地震危险性分析[J].地球学报,2010,31(4):541–548.(CHEN Qunce,AN Qimei,SUN Dongsheng,et al.Current in-situ stress state ofShanxi basin and analysis of earthquake risk[J].Acta GeoscienticaSinica,2010,31(4):541–548.(in Chinese))
    [22]易桂喜,闻学泽,王思维,等.由地震活动参数分析龙门山—岷山断裂带的现今活动习性与强震危险性[J].中国地震,2006,22(2):117–125.(YI Guixi,Wen Xueze,WANG Siwei,et al.Study on faultsliding behaviors and strong earthquake risk of the Longmenshan—Minshan fault zones from current seismicity parameters[J].EarthquakeResearch in China,2006,22(2):117–125.(in Chinese))
    [23]国家地震局.中国地震烈度区划工作报告[M].北京:地震出版社,1981:17–30.(State Seismological Bureau.Seismic intensity zoningreport[M].Beijing:Earthquake Press,1981:17–30.(in Chinese))
    [24]张培震,徐锡伟,闻学泽,等.2008年汶川8.0级地震发震断裂的滑动速率、复发周期和构造成因[J].地球物理学报,2008,51(4):1 066–1 073.(ZHANG Peizhen,XU Xiwei,WEN Xueze,et al.Sliprates and recurrence intervals of the Longmenshan active fault zone,and tectonic implications for the mechanism of the May 12 Wenchuanearthquake,2008,Sichuan,China[J].Chinese Journal of Geophysics,2008,51(4):1 066–1 073.(in Chinese))
    [25]闻学泽,张培震,杜方,等.2008年汶川8.0级地震发生的历史与现今地震活动背景[J].地球物理学报,2009,52(2):444–454.(WEN Xueze,ZHANG Peizhen,DU Fang,et al.The backgroundof historical and modern seismic activities of occurrence of the Ms8.0Wenchuan,Sichuan earthquake[J].Chinese Journal of Geophysics,2009,52(2):444–454.(in Chinese))
    [26]闻学泽,杜方,张培震,等.巴彦喀拉块体北和东边界大地震序列的关联性与2008年汶川地震[J].地球物理学报,2011,54(3):706–716.(WEN Xueze,DU Fang,ZHANG Peizhen,et al.Correlation of major earthquake sequences on the Northern and Easternboundaries of the Bayan Har block,and its relation to the 2008 Wenchuanearthquake[J].Chinese Journal of Geophysics,2011,54(3):706–716.(in Chinese))

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