汶川地震同震形变场对川滇地区主要活动断裂地震发生趋势的影响
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摘要
以所建立的川滇地区主要活动块体及其周边断裂带的模型和前期利用GPS及水准资料反演所得到的断裂带长期运动速率作为基础,将汶川地震引起的同震错动量加入到三维断裂几何模型中,计算出汶川地震大范围的同震形变场,然后基于该同震形变场和活动断裂三维几何模型反演了各条断裂对该同震形变场的反映,并通过与各断裂带长期运动速率对比,得到了汶川地震对川滇地区各主要活动断裂带发震趋势的影响.结果表明,在汶川地震引起的同震形变场作用下,在川滇交界东部地区,龙门山断裂带南西段地震危险性提前了305a,鲜水河断裂带南东段大致提前了19a,安宁河断裂带和则木河断裂带分别提前了21a和12a,大凉山断裂带北段和南段分别提前了9.1a和18a,马边断裂带的地震危险性则提前了51a;对川滇交界西部的丽江—小金河断裂带南西段、怒江断裂带、龙陵—澜沧断裂带、南汀河断裂带、中甸断裂带等断裂带地震的能量积累也有促进作用;相反在鲜水河断裂带北西段、小江断裂带等历史地震频发的断裂带上,地震危险性具有一定的减速作用.
Based on a 3-D active fault geometric model established for Sichuan--Yunnan region and long-term fault slip rate inverted from GPS and leveling data, we firstly calculated the coseismic deformation induced by the seismic dislocation of the 2008 Wenchuan earthquake. Then using the 3-D geometric model we inverted the deformation field for potential slip of each active fault. By comparing the calculated potential fault slip with the estimated long-term fault slip rate we inferred the influence of the Wenchuan earthquake on the seismic risk of the active faults. The results are as follows: the faults in eastern conjunction zone of Sichuan and Yunnan province, i.e., the southwestern segment of Longmenshan fault, the southern segment of Xianshuihe fault, Anninghe fault, Zemuhe fault, northern and southern segments of Daliangshan fault, and Mabian fault, have advanced their seismic risk of 305, 19, 12, 9.1, 18 and 51 years, respectively. As to the western conjunction zone of Sichuan and Yunnan province, we found the faults like Lijiang--Xiaojinhe fault, Nujiang fault, Longling--Lancang fault, Nantinghe fault, and Zhongdian fault, also got their seismic risk advanced. On the opposite, the faults, like the northwestern segment of Xianshuihe fault and Xiaojiang fault, become safer than before after the Wenchuan earthquake.
引文
①张培震.2008.个人交流.
    程佳.2008.川西地区现今地壳运动的大地测量观测研究[D].北京:中国地震局地质研究所:57--87.
    程佳,甘卫军,王泽河,陈为涛,肖根如.2009.2001年昆仑山口西MS8.1级地震前背景形变场的模拟研究[J].地震地质,31(1):97--111.
    邓起东.2007.中国活动构造图(1:400万)[M].北京:地震出版社:1--5.
    虢顺民,向宏发,计凤桔,张晚霞.1996.红河断裂带第四纪右旋走滑与尾端拉张转换关系研究[J].地震地质,18(4):301--303.
    虢顺民,向宏发,周瑞崎,徐锡伟,董兴权,张晚霞.1999.滇西南龙陵—澜沧断裂带:大陆地壳上一条新生的破裂带[J].科学通报,44(19):2118--2121.
    国家地震局地质研究所.1990.滇西北地区活动断裂[M].北京:地震出版社:106--124.
    国家重大科学工程“中国地壳运动观测网络”项目组.2008.GPS测定的2008年汶川MS8.0级地震的同震位移场[J].中国科学(D辑),38(10):1195--1206.
    韩竹军,向宏发,冉勇康.2001.青藏高原东缘礼县一罗家堡断裂带晚更新世以来的活动性分析[J].地震地质,23(1):43--48.
    何宏林,池田安隆,何玉林,东乡正美,陈杰,陈长云,田力正好,越后智雄,冈田真介.2008.新生的大凉山断裂带:鲜水河—小江断裂系中段的裁弯取直[J].中国科学:D辑,38(5):564--574.
    李京昌.1998.滇西怒江断裂带新构造特征[J].地震地质,20(4):312--320.
    李天袑,游泽李,杜其方,吴芝雄,蒋远明.1986.鲜水河断裂带的地质特征及其运动方式[C]∥鲜水河断裂带地震学术讨论会文集.北京:地震出版社:1--7.
    马保起,苏刚,侯治华,舒赛兵.2005.利用岷江阶地的变形估算龙门山断裂带中段晚第四纪滑动速率[J].地震地质,27(2):234--242.
    沈军,汪一鹏,任金卫.2001.中国云南德钦中甸大具断裂带第四纪右旋走滑运动[G]∥马宗晋等编.青藏高原岩石圈现今变形与动力学(3).北京:地震出版社:123--135.
    宋方敏,汪一鹏,俞维贤.1998.小江活动断裂带[M].北京:地震出版社:149--151.
    唐荣昌,韩渭宾.1993.四川活动断裂与地震[M].北京:地震出版社:149--152.
    万永革,沈正康,曾跃华,盛书中.2007.青藏高原东北部的库仑应力积累演化对大地震发生的影响[J].地震学报,29(2):115--129.
    王辉,刘杰,石耀林,张怀,张国民.2008.鲜水河断裂带强震相互作用的动力学模拟研究[J].中国科学:D辑,38(7):808--818.
    王国芝,胡瑞忠,方维萱,陶晓风.2001.澜沧江断裂带走滑变形及与临沧锗矿的关系[J].矿物学报,(4):695--698.
    王晋南.1990.维西—乔后断裂带[G]∥滇西北地区活动断裂.北京:地震出版社:116--124.
    王阎昭,王恩宁,沈正康,王敏,甘卫军,乔学军,孟国杰,李铁明,陶玮,杨永林,程佳,李鹏.2008.基于GPS资料约束反演川滇地区主要断裂现今活动速率[J].中国科学:D辑,38(5):582--589.
    闻学泽,Allen C R,罗灼礼,钱洪,周华伟,黄伟师.1989.鲜水河全新世断裂带的分段性、几何特征及其地震构造意义[J].地震学报,11(4):362--372.
    向宏发,韩竹军,虢顺民,张晚霞,陈立春.2004.红河断裂带大型右旋走滑运动与伴生构造地貌变形[J].地震地质,26(4):598--610.
    徐锡伟,闻学泽,郑荣章,马文涛,宋方敏,于贵华.2003.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,33(增刊):151--162.
    徐锡伟,张培震,于贵华,郑荣章,罗海原,郑斌.2005.川西理塘断裂带平均滑动速率、地震破裂分段与复发特征[J].中国科学:D辑,35(6):540--551.
    徐锡伟,闻学泽,陈桂华,于贵华.2008.巴颜喀拉地块东部龙日坝断裂带的发现及其大地构造意义[J].中国科学:D辑,38(5):529--542.
    袁道阳,刘小龙,张培震,刘小龙.2003.青海热水—日月山断裂带的新活动特征[J].地震地质,25(1):155--165.
    张世民,聂高众,刘旭东,任俊杰,苏刚.2005.荥经—马边—盐津逆冲构造带断裂运动组合及地震分段特征[J].地震地质,27(2):221--233.
    周荣军,马声浩,蔡长星.1996.甘孜—玉树断裂带的晚第四纪活动特征[J].中国地震,12(3):250--260.
    周荣军,蒲晓虹,何玉林,黎小刚,戈天勇.2000.四川岷江断裂带北段的新活动、岷山断块的隆起及其与地震活动的关系[J].地震地质,22(3):285--294.
    周荣军,陈国星,李勇,周朝晖,龚宇,何玉林,黎小刚.2005.四川西部理塘-巴塘地区的活动断裂与1989年巴塘6.7级震群发震构造研究[J].地震地质,27(1):31--43.
    朱艾斓,徐锡伟,周永胜,尹京苑,甘卫军,陈桂华.2005.川西地区小震重新定位及其活动构造意义[J].地球物理学报,48(3):629--636.
    Allen C R,Luo Z L,Qiang H,Wen X Z,Zhou H W,Huang WS.1991.Field study of a highly active fault zone:TheXianshuihe fault of southwestern China[J].Geological Society of America Bulletin,103:1178--1199.
    Burchfiel B C,Royden L H,van der Hilst R D,Hager B H,Chen Z,King R W,Li C,LüJ,Yao H,Kirby E.2008.Ageological and geophysical context for the Wenchuan earthquake of12May2008,Sichuan,People′s Republic ofChina[J].Geological Society Bunetin Today,18(7):1--11.
    Clark M K,Bush J M,Royden L M.2005.Dynamic topography produced by lower crustal flow against rheologicalstrength heterogeneities bordering the Tibetan Plateau[J].Geophys J Int,162:575--590.
    Gan W,Svarc J L,Savage J C,Prescott WH.2000.Strain accumulation across the Eastern California Shear Zone at lati-tude36degrees30′N[J].J Geophys Res,105:16229--16236.
    Ji C,Hayes G.2008.Preli minary result of the May12,2008MW7.9Eastern Sichuan,China earthquake.[2008-10-30].http:∥earthquake.usgs.gov/eqcenter/eqinthenews/2008/us2008ryan/finite_fault.php.
    Kirby E,Harkins N,Wang E,Shi X H,Fan C,Burbank D.2007.Sliprate gradients alongthe eastern Kunlunfault[J].Tectonics,26,TC2010,doi:1029/2006TC002033.
    Lacassin P,Replumaz A,Leloup P H.1998.Hairpin river loops and slip-sense inversion on southeast Asian strike-slipfaults[J].Geology,26(8):703--706.
    Okada Y.1985.Surface deformation due to shear and tensile faults in a half-space[J].Bull Seism Soc Amer,75:1135--1154.
    Okada Y.1992.Internal deformation due to shear and tensile faultsin a half-space[J].Bull SeismSoc Amer,82:1018--1040.
    Parsons T.2002.Post-1906stress recovery of the San Andreas fault systemcalculated fromthree-di mensional finite ele-ment analysis[J].J Geophys Res,107(8):2162.
    Parsons T,Ji C,Kirby E.2008.Stress changes fromthe2008Wenchuan earthquake andincreased hazardinthe Sichuanbasin[J].Nature,454:509--510.
    Prescott W H,Yu S B.1986.Geodetic measurement of horizontal deformationinthe northern San Francisco Bay region,California[J].J Geophys Res,91(B7):7475--7484.
    Savage J C,Svarc J L,Prescott W H.1999.Geodetic esti mates of fault slip rates in the San Francisco Bay area[J].JGeophys Res,104,4995--5002.
    Shen Z K,LüJ,Wang M,Burgmann R.2005.Contemporary crustal deformation around the southeast borderland ofthe Tibetan Plateau[J].J Geophys Res,110,B11409,doi:10.1029/2004JB003421.
    Toda S,Lin J,Meghraoui M,Stain R S.2008.12May2008M=7.9Wenchuan,China,earthquake calculated to in-crease failure stress and seismicity rate on three major fault systems[J].Geophys Res Lett,35,L17305,doi:10.1029/2008GL034903.

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