汶川8.0级地震前后福建地区形变及应力场演化
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摘要
通过对形变与GPS观测资料的处理,分析汶川地震前后福建地区形变及应力场的演化过程。结果表明,汶川地震前,以晋江-永安断裂带为界,北部为应力压缩区,南部为压力拉张区。汶川地震后,长乐-诏安断裂带及以东区域为应力压缩区,除此以外的西部区域为应力拉张区。
On basis of deformation and GPS data,the evolution process of deformation and stress field pre-and post Wenchuan M8.0 earthquake in Fujian province area is analyzed.The results show that before Wenchuan M8.0 earthquake,bounded by Jinjiang-Yong'an faults,stress field of the north of Fujian province is compress,and of the south is extension;After Wenchuan M8.0 earthquake,to the east of Changle-Zhao'an faults stress field,the stress field is compress,and to the west is extension.
On basis of deformation and GPS data,the evolution process of deformation and stress field pre-and post Wenchuan M8.0 earthquake in Fujian province area is analyzed.The results show that before Wenchuan M8.0 earthquake,bounded by Jinjiang-Yong'an faults,stress field of the north of Fujian province is compress,and of the south is extension;After Wenchuan M8.0 earthquake,to the east of Changle-Zhao'an faults stress field,the stress field is compress,and to the west is extension.
引文
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[2]Brodsky E E,Roeloffs E A,Woodcock D,et al.A mechanismfor sustained groundwater pressure changes induced by distant earthquakes[J].JGeophys Res,2003,108(t38),doi:10.1029/2002JB002321.
[3]Roeloffs E A.Persistent water level changesin a well near Parkfield California,due tolocal and distant earthquakes[J].J Geophys Res,1998,103(B1):869-889.
[4]黄松风.长诏断裂带垂直运动与地震关系初探[J].大地测量与地球动力学,2003,23(4):99-104.
[5]张跃刚,孙佩卿,陈立强,等.短水准震前异常的演化特征[J].华北地震科学,2002,20(3):14-21.
[6]刘祥海,章思亚.山西断裂带的地震活动与形变资料分析研究[J].华北地震科学,2006,24(4):32-35.
[7]闫伟,牛安福,马秀香,等.以昆仑山口西地震为例研究GPS基线长度与方向对地震的敏感性[J].地震,2007,27(4):85-90.
[8]李祖宁,刘序俨,吴绍祖,等.台湾海峡两岸地壳相对运动分析[J].大地测量与地球动力学,2007,27(5):18-21.
[9]李祖宁,傅容珊,黄建华.剥蚀及地幔作用下青藏高原隆升过程的数值模拟[J].地球物理学报,2002,45(4):516-524.
[10]李祖宁,傅容珊,郑勇,等.多种驱动力作用下东亚大陆形变及应力场演化[J].地震学报,2002,24(1):17-26.
[11]郭逢英,史华,丁学仁,等.GPS测量揭示的福建沿海地区的现今地形变[J].大地测量与地球动力学,2003,23(3):87-92.
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