天津地区地壳垂向形变(GPS)与文安地震
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摘要
利用天津地区GPS局域网的观测资料,研究了天津地区地壳垂向形变及其与文安Ms5.1地震的关系。结果表明,在文安地震前,天津地区地壳上升从N向S扩展,到地震期间,全区以上升变化占主导,震后地壳下降由S向N发展。站点的时序变化曲线表明,天津南部的站点在文安地震前后出现了明显的异常,一般出现于震前数月至1年,震后恢复。
The vertical crustal deformation in Tianjin and the relation between which and the Wenan Ms5.1 earthquake are researched by using the data of the GPS network in Tianjin.The results show that the uplift region had extended from north to south Tianjin area before the Wenan Ms5.1 earthquake,the change was dominant by rise in the whole region as the closing to earthquake and then the subsidence region had extended from south to north after the earthquake.The variation of the time sequence curve of the GPS sites shows that there is a obviously anomaly happened in southern part of Tianjin before and after the earthquake,lasting a period of several months or more than a year before the earthquake and resumed after the earthquake.
The vertical crustal deformation in Tianjin and the relation between which and the Wenan Ms5.1 earthquake are researched by using the data of the GPS network in Tianjin.The results show that the uplift region had extended from north to south Tianjin area before the Wenan Ms5.1 earthquake,the change was dominant by rise in the whole region as the closing to earthquake and then the subsidence region had extended from south to north after the earthquake.The variation of the time sequence curve of the GPS sites shows that there is a obviously anomaly happened in southern part of Tianjin before and after the earthquake,lasting a period of several months or more than a year before the earthquake and resumed after the earthquake.
引文
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11武安绪,等.汶川大地震北京地区形变观测的同震效应与特征分析[J].国际地震动态,2008,(11):117.(WuAnxu,et al.Coseismic effect and characteristic analysis ofdeformation observation in Beijing area for Wenchuan earth-quake[J].Recent Developments in World Seismology,2008,(11):117)
2胡惠民,等.地下水位变化引起的地面形变[J].地震学报,1981,3(3):276-282.(Hu Huimin,et al.Ground sur-face deformation caused by the change of ground water level[J].Acta Seismologica Sinica,1981,3(3):276-282)
3王若柏.城市地面沉降的灾害链特征——以天津市为例[J].气象与减灾研究,2008,31(1):54-60.(WangRuobai.Disaster chain of urban land subsidence in Tianjin[J].Meteorology and Disaster Reduction Research,2008,31(1):54-60)
4刘经南,等.中国大陆现今垂直形变特征的初步探讨[J].大地测量与地球动力学,2002,(3):1-5.(Liu Jingnan,etal.Preliminary research on characteristic of present-dayvertical deformation of China mainland[J].Journal of Geod-esy and Geodynamics,2002,(3):1-5)
5孙建中,杨少敏.用GPS资料揭示现今中国大陆构造运动[J].大地测量与地球动力学,2005,(3):75-80.(SunJianzhong and Yang Shaomin.Tectonic movement of Chinesemainland revealed from GPS data[J].Journal of Geodesyand Geodynamics,2005,(3):75-80)
6董克刚,等.利用GPS监测天津市地面沉降的可行性研究[J].大地测量与地球动力学,2008,(4):68-71.(Dong Kegang,et al.Study on monitoring land subsidence inTianjin with GPS[J].Journal of Geodesy and Geodynamics,2008,(4):68-71)
7黄立人,等.GPS观测得到的天津地区的现今形变[J].大地测量与地球动力学,2002,(4):17-20.(Huang Liren,et al.Recent deformation deduced from GPS observation inTianjin area[J].Journal of Geodesy and Geodynamics,2002,(4):17-20)
8张环曦,等.昌黎井数字化水位水温对汶川地震同震响应机理分析[J].华北地震科学,2009,27(4):46-49.(Zhang Huanxi,et al.Analysis of coseismic water level andtemperature changes in Changli well caused by the Wen-chuanMs8.0 earthquake[J].North China earthquake sci-ences,2009,27(4):46-49)
9苏树朋,等.易县地震台形变资料对汶川8.0级大地震的反应[J].华北地震科学,2009,27(2):54-58.(Su Shu-peng,et al.The response of crustal deformation data in Yix-ian seismic station to wenchuanMs8.0 earthquake[J].NorthChina earthquake sciences,2009,27(2):54-58)
10武安绪,等.从昌平台沙层应变记录看汶川大地震孕震过程[J].国际地震动态,2009,(4):17.(Wu Anxu,etal.View the seismogenic process of Wenchuan huge earth-quakeMs8.0 from sand bed stain records at Changping sta-tion[J].Recent Developments in World Seismology,2009,(4):17)
11武安绪,等.汶川大地震北京地区形变观测的同震效应与特征分析[J].国际地震动态,2008,(11):117.(WuAnxu,et al.Coseismic effect and characteristic analysis ofdeformation observation in Beijing area for Wenchuan earth-quake[J].Recent Developments in World Seismology,2008,(11):117)
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