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 charaeter 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 quasisynchronism 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-Cluing＇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.
出处
《高原地震》
2005年第3期18-26,共9页
Plateau Earthquake Research
基金
<城市活断层>子项目<拉张区城市地区构造模型深部结构及现代活动状态研究>资助
关键词
临潼-长安断裂
垂直形变
重力变化
构造活动
Lintong-Chang＇ an fault
Vertical deformation
Gravity change
Tectonic movement
