临潼-长安断裂带构造变形及分段特征
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摘要
对临潼-长安断裂带1970~1996年跨断裂水准资料、1983~2004年跨断层场地水准资料和1992~2004年重力段差资料进行了定量计算与分析。分析结果表明:①临潼-长安断裂是近期非常活跃的断裂,断裂带中主次断裂具有对称活动特点,江伊-鲍坡断裂在该断裂带整体活动中居主动地位;②跨临潼-长安断裂带的麻街和沣峪口两场地在地震前,垂直形变均不同程度地出现准同步快速下降的异常变化,但震后区域应力场的调整过程中两场地的影响存在差异;③临潼-长安断裂带的活动具有明显的分段性特点,形变测量资料分析表明,其南段活动比较稳定,而北段的活动则很活跃;④场地水准与跨断裂水准资料有较好的一致性,重力段差变化与场地垂直形变有较好的相关性。
The paper is quantitative calculated and analyzed leveling data across fault from 1970 to 1996,leveling data across fault field of Lintong-Chang'an fault belt from 1983 to 2004,and gravity data across Lintong-Chang'an fault belt from 1992 to 2004.The analysis shows:①Lintong-Chang'an fault is a very active fault in the near future.The primary and secondary faults have cha-racter of symmetrical active in the active fault belts,the Jiangyi-Baopo fault is in the primary position of the all active fault belts.②The vertical deformation showed the difference of degree quasi-synchronism fast decline in the Majie and Fengyukou across fault field of span Lintong-Chang'an fault belt before earthquake,but after earthquake the change showed difference in Majje and Fengyukou across fault field,due to the area structure stress field change.③The action of Lintong-Chang'an fault belt has distinctness section character.According to analysing data across fault field and across fault level,the south section is fairly stable and the north section is very active.④The data across fault field of level and the across fault of level are consistent.Also the gravity change is related with the vertical deformation.
The paper is quantitative calculated and analyzed leveling data across fault from 1970 to 1996,leveling data across fault field of Lintong-Chang'an fault belt from 1983 to 2004,and gravity data across Lintong-Chang'an fault belt from 1992 to 2004.The analysis shows:①Lintong-Chang'an fault is a very active fault in the near future.The primary and secondary faults have cha-racter of symmetrical active in the active fault belts,the Jiangyi-Baopo fault is in the primary position of the all active fault belts.②The vertical deformation showed the difference of degree quasi-synchronism fast decline in the Majie and Fengyukou across fault field of span Lintong-Chang'an fault belt before earthquake,but after earthquake the change showed difference in Majje and Fengyukou across fault field,due to the area structure stress field change.③The action of Lintong-Chang'an fault belt has distinctness section character.According to analysing data across fault field and across fault level,the south section is fairly stable and the north section is very active.④The data across fault field of level and the across fault of level are consistent.Also the gravity change is related with the vertical deformation.
引文
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[2]李永善,耿大玉,李金正,等.西安地裂及渭河盆地活断层研究[M].北京:地震出版社,1992.152~164.
[3]国家地震局,《鄂尔多斯周缘活动断裂系》课题组.鄂尔多斯周缘活动断裂系[M].北京:地震出版社,1988.140~142.
[4]巩守文.门源、江口地震的断层形变前兆分析[J].地震,1992,12(1):35~40.
[5]邢西淳,邵辉成,李炳乾,等.陕甘宁青地区的地形变特征与强震活动[J].大地测量与地球动力学,2003,23(4):80~86.
[6]祝意青,熊善宝,陈兵,等.泾阳4.8级地震应急监测及泾阳台短水准异常变化分析[J].地震地磁观测与研究.1999,20(1):27~32.
[7]江在森,张希,祝意青,等.昆仑山口西Ms8.1地震前区域构造变形背景[J].中国科学D辑,2003,33(增刊):163~172.
[8]祝意青,胡斌,朱桂芝,等.民乐6.1、岷县5.2级地震前区域重力场变化[J].大地测量与地球动力学,2005,25(1):24~29.
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