汶川Ms8.0地震北川附近同震垂直位移特征
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摘要
汶川发生8.0级地震后,中国地震局第一监测中心和第二监测中心分别施测了平武-北川-绵竹(201.8km)和桂溪-江油(35.6 km)两条一等水准测线。对两条测线的处理获得以下结果:1)汶川8.0级地震造成平武县古城区附近的青川断裂同震垂直位移不大,断裂上下盘相对垂直位移量为0.064 m,断层表现为逆断活动;2)北川县城附近的北川-映秀断裂同震垂直位移达4.711 m,断裂上下盘相对垂直位移量为5.100 m,断层表现为逆断活动;3)桂溪附近的北川-映秀断裂同震垂直位移量为2.440 m;4)江油-广元断裂同震垂直位移不大,断裂上下盘相对垂直位移量为0.101 m;5)平武县南坝镇附近的北川-映秀断裂同震垂直位移较大,最大为1.003 m,断裂上下盘相对垂直位移量为1.381 m,断层表现为逆断活动。
After the Wenchuan Ms 8.0 earthquake,the First and Second Crust Monitoring and Application Centers of China Earthquake Administrator measured two first order leveling lines from Pingwu to Beichuan to Mianzhu,which is of 201.8 km,and from Guixi to Jiangyou,which is of 35.6 km,respectively.By processing and analyzing the leveling data before and after the earthquake,we calculated the coseismic vertical displacement and obtained some results as follows.1)The coseismic vertical displacement in Qingchuan fault near the ancient urban of Pingwu caused by Wenchuan Ms 8.0 earthquake is small as the relative vertical displacement between the hanging wall and foot wall of the Qingchuan fault is 0.064 m and the Qingchuan fault shows thrust fault properties.2)The coseismic vertical displacement in Beichuan-Yingxiu fault near Beichuan caused by Wenchuan Ms 8.0 earthquake is large,the maximum vertical displacement is 4.711 m and the relative vertical displacement of the Beichuan-Yingxiu fault is 5.100 m,the Beichuan-Yingxiu fault shows thrust fault properties too.3)The coseismic vertical displacement in Beichuan-Yingxiu fault near Guixi is about 2.440 m.4)The coseismic vertical displacement in Jiangyou-Guangyuan fault about 12 km northwards from Jiangyou is small as,the relative vertical displacement of the Jiangyou-Guangyuan fault is 0.101 m.5)The coseismic vertical displacement in Beichuan-Yingxiu fault near Nanba in Pingwu is relative large as the relative vertical displacement of the Beichuan-Yingxiu fault is 1.381 m,the Qingchuan fault shows thrust fault properties.
After the Wenchuan Ms 8.0 earthquake,the First and Second Crust Monitoring and Application Centers of China Earthquake Administrator measured two first order leveling lines from Pingwu to Beichuan to Mianzhu,which is of 201.8 km,and from Guixi to Jiangyou,which is of 35.6 km,respectively.By processing and analyzing the leveling data before and after the earthquake,we calculated the coseismic vertical displacement and obtained some results as follows.1)The coseismic vertical displacement in Qingchuan fault near the ancient urban of Pingwu caused by Wenchuan Ms 8.0 earthquake is small as the relative vertical displacement between the hanging wall and foot wall of the Qingchuan fault is 0.064 m and the Qingchuan fault shows thrust fault properties.2)The coseismic vertical displacement in Beichuan-Yingxiu fault near Beichuan caused by Wenchuan Ms 8.0 earthquake is large,the maximum vertical displacement is 4.711 m and the relative vertical displacement of the Beichuan-Yingxiu fault is 5.100 m,the Beichuan-Yingxiu fault shows thrust fault properties too.3)The coseismic vertical displacement in Beichuan-Yingxiu fault near Guixi is about 2.440 m.4)The coseismic vertical displacement in Jiangyou-Guangyuan fault about 12 km northwards from Jiangyou is small as,the relative vertical displacement of the Jiangyou-Guangyuan fault is 0.101 m.5)The coseismic vertical displacement in Beichuan-Yingxiu fault near Nanba in Pingwu is relative large as the relative vertical displacement of the Beichuan-Yingxiu fault is 1.381 m,the Qingchuan fault shows thrust fault properties.
引文
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4中国地震局网.汶川8.0级地震震间垂直形变速率场监测结果[ED/OL].http://www.cea.gov.cn/m anage/ht-m l/,2009,05,07.
5唐文清,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):57-59.
6安其美,等.龙门山断裂带的性质与活动性研究[J].大地测量与地球动力学,2004,24(2):115-119.
2唐荣昌,韩渭宾.四川活动断裂与地震[M].北京:地震出版社,1993.
3李传友,等.汶川Ms8.0地震地表破裂带北川以北段的基本特征[J].地震地质,2008,30(3):683-695.
4中国地震局网.汶川8.0级地震震间垂直形变速率场监测结果[ED/OL].http://www.cea.gov.cn/m anage/ht-m l/,2009,05,07.
5唐文清,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):57-59.
6安其美,等.龙门山断裂带的性质与活动性研究[J].大地测量与地球动力学,2004,24(2):115-119.
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