岷江上游水系对龙门山断裂带右旋走滑作用的响应
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摘要
汶川8.0级特大地震是岷江上游流域最新一次区域构造活动,在此次地震中,岷江河道因北川-映秀断裂北西盘的右旋走滑作用而被水平错动0.8±0.2 m,岷江河道南西方向的河流阶地也被同步位错0.6±0.1 m。切过龙门山主干断裂的岷江上游干、支流水系因若干次历史地震驱动的走滑作用而发生同步弯曲。根据水系水平扭错量和岷江干、支流初始形成时间计算可知,穿越岷江支流河道的汶川-茂县断裂右旋走滑速率为1～1.4 mm/a,切过岷江干流河道的北川-映秀断裂和彭县-灌县断裂右旋滑动速率分别为0.94 mm/a和0.71 mm/a。计算结果表明,龙门山各主干断裂右旋走滑作用有自北西向南东减弱的趋势。
The Wenchuan Ms8.0 earthquake was the latest regional tectonic activity in the upper Min River basin.The horizontal displacement of Min River channel reached 0.8±0.2 m for dextral strike slip movement of Beichuan-Yingxiu fault,and the synchronous displacement of the river terrace in the southwest side of Min River channel reaches 0.6±0.1 m.The horizontal movement of the main and tributary of Min River were caused by the strike slipping in historical earthquakes.The dextral strike-slip rate of faults was calculated according to the horizontal slip amount and initial formation time of water system.The strike-slip rate of Wenchan-Maoxian fault is 1-1.4 mm/a,the strike-slip rate of Beichuan-Yingxiu fault is 0.94mm/a,the strike-slip rate of Pengxian-Guanxian fault is 0.71 mm/a.The intensity of dextral strike slipping of main faults in the Longmen Mountain were decreased from northwest to southeast.
The Wenchuan Ms8.0 earthquake was the latest regional tectonic activity in the upper Min River basin.The horizontal displacement of Min River channel reached 0.8±0.2 m for dextral strike slip movement of Beichuan-Yingxiu fault,and the synchronous displacement of the river terrace in the southwest side of Min River channel reaches 0.6±0.1 m.The horizontal movement of the main and tributary of Min River were caused by the strike slipping in historical earthquakes.The dextral strike-slip rate of faults was calculated according to the horizontal slip amount and initial formation time of water system.The strike-slip rate of Wenchan-Maoxian fault is 1-1.4 mm/a,the strike-slip rate of Beichuan-Yingxiu fault is 0.94mm/a,the strike-slip rate of Pengxian-Guanxian fault is 0.71 mm/a.The intensity of dextral strike slipping of main faults in the Longmen Mountain were decreased from northwest to southeast.
引文
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[3]Zhang Huiping,Yang Nong,Zhang Yueqiao.Geomorphology of theMinjiang drainage system(Sichuan,China)and its structural impli-cations[J].Quaternary Science,2006,26(1):126-135[张会平,杨农,张岳桥.岷江水系流域地貌特征及其构造指示意义[J].第四纪研究,2006,26(1):126-135]
[4]Gao Xuanyu,Li Yong.Comparison on the incision rate in the upperand middle reaches of Minjiang river[J].Resources and Environ-ment in the Yangtze Basin,2006,15(4):517-521[高玄彧,李勇.岷江上游和中游几个河段的下蚀率对比研究[J].长江流域资源与环境,2006,15(4):517-521]
[5]Yang Nong,Zhang Yueqiao,Meng Hui.Study of the Minjiang riverterraces in the western Sichuan plateau[J].Journal of Geomechan-ics,2003,9(4):363-370[杨农,张岳桥,孟辉.川西高原岷江上游河流阶地初步研究[J].地质力学学报,2003,9(4):363-370]
[6]Ma Baoqi,Su Gang,Hou Zhihua,et al.Late quaternary slip rate inthe central part of the Longmenshan fault zone from terrace deforma-tion along the Minjiang river[J].Seismology and Geology,2005,27(2):234-242[马保起,苏刚,侯治华,等.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,2005,27(2):234-242]
[7]Tang Rongchang,Wen Dehua,Huang Zuzhi,et al.The quaternaryactivity characteristics of several major active faults in the Song-pan—Longmenshan region[J].China Earthquake,1991,7(3):64-71[唐荣昌,文德华,黄祖智,等.松潘-龙门山地区主要活动断裂带第四纪活动特征[J].中国地震,1991,7(3):64-71]
[8]Li Haibing,Fu Xiaofang,Woerd J V D,et al.Co-seisimic surfacerupture and dextral-slip oblique thrusting of the Ms8.0 Wenchuanearthquake[J].Acta Geologica Sinica,2008,82(12):1623*1643[李海兵,付小方,Woerd J V D,等.汶川地震(Ms8.0)地表破裂及其同震右旋斜向逆冲作用[J].地质学报,2008,82(12):1623-1643]
[9]Fu Bihong,Shi Pilong,Zhang Zhiwu.Spatial characteristics of thesurface rupture produced by the Ms8.0 Wenchuan earthquake usinghigh-resolution remote sensing imagery[J].Acta Geologica Sinica,2008,82(12):1679-1687[付碧宏,时丕龙,张之武,等.四川汶川Ms8.0大地震地表破裂的遥感影像解析[J].地质学报,2008,82(12):1679-1687]
[10]Li Yong,Zhou Rongjun,Densmore A L,et al.Continental dynamicsand geological responses of the eastern margin of Qinghai-Tibetplateau[M].Beijing:Geological Publishing House,2006.[李勇,周荣军,Densmore A L,等.青藏高原东缘大陆动力学过程与地质响应[M].北京:地质出版社,2006.]
[11]Li Yong,Zeng Yunfu.The filling sequence in Longmenshan fore-land basin[J].Journal of Chengdu University of Technology,1994,21(3):46-55[李勇,曾允孚.龙门山前陆盆地充填序列[J].成都理工大学学报,1994,21(3):46-55]
[12]Wang Fenglin,Li Yong,Li Yongzhao,et al.Sedmentary characteris-tics of the Cenozoic Dayi conglomerate in Chengdu basin[J].Jour-nal of Chengdu University of Technology,2003,30(2):139-146[王凤林,李勇,李永昭,等.成都盆地新生代大邑砾岩的沉积特征[J].成都理工大学学报:自然科学版,2003,30(2):139-146]
[13]Zhou Rongjun,Li Yong,Densmore A L.Active tectonics of theeastern margin of the Tibet plateau[J].Mineralogy and Petrology,2006,26(2):40-51[周荣军,李勇,Densmore A L.青藏高原东缘活动构造[J].矿物岩石,2006,26(2):40-51]
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[15]Dong Shunli,Li Yong,Chen Longsheng,et al.Surface rupturing ofWenchuan Ms8.0 earthquake based on fault scratch at Bajiaomiao,Dujianyan[J].Quaternary Science,2009,29(3):439-448[董顺利,李勇,陈龙生,等.汶川Ms8.0地震的地表破裂过程———以都江堰八角庙村断层擦痕剖面为例[J].第四纪研究,2009,29(3):439-448]
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