文安地震与首都圈地区数字化应变资料分析
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摘要
2005年以来首都圈地区易县、延庆数字化线应变观测显示出现较大幅度的压缩性趋势变化,其中延庆台伸缩仪NS向观测在2006年6、7月份出现转折变化;易县台应变组合观测计算的平面应变参数在2006年7月4日文安5.1级地震前1~2天出现转折变化;经分析认为,2005年以来首都圈西部区域应变开始加速,2005年8月31日蔚县4.0级地震发生在加速变化过程中,而文安地震发生在附近应变场的转折过程中,可能预示着文安地震后首都圈地区进入了下一个应变积累变化过程。
The line-strain observation at Yixian and Yanqing stations shows that large change of compression has appeared in the Capital Circle Area since 2005.The strain in NS turned back at Yanqing station in June and July,2006.The parameters of plane strain are calculated using extensometer data in 3 directions at Yixian station.The result shows the parameters of plane strain changed in reverse 1~2 days before the MS5.1 Wen′an earthquake(July 4th 2006) from.The strain has been accelerated in the western part of the Capital Circle Area since 2005 based on analysis,when Yuxian 4.0 earthquake(Aug.31,2005) occurred,Wen'an earthquake occurred in course of plane strain turning back.It may indicate that plane strain enters a stage for strain accumulation after Wen'an earthquake in Capital Circle Area.
The line-strain observation at Yixian and Yanqing stations shows that large change of compression has appeared in the Capital Circle Area since 2005.The strain in NS turned back at Yanqing station in June and July,2006.The parameters of plane strain are calculated using extensometer data in 3 directions at Yixian station.The result shows the parameters of plane strain changed in reverse 1~2 days before the MS5.1 Wen′an earthquake(July 4th 2006) from.The strain has been accelerated in the western part of the Capital Circle Area since 2005 based on analysis,when Yuxian 4.0 earthquake(Aug.31,2005) occurred,Wen'an earthquake occurred in course of plane strain turning back.It may indicate that plane strain enters a stage for strain accumulation after Wen'an earthquake in Capital Circle Area.
引文
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[2]郗钦文,杨林章,黎凯武.地球对引潮力的响应及综合分析[J].中国地震,1994,9(Supp):83-89.
[3]张晶,牛安福,高福旺,等.数字化形变观测提取的地震短临异常特征[J].地震,2003,23(1):70-76.
[4]华祥文.应力变化与强震潜在震源[M].北京:科学技术出版社,1988.32-42.
[5]梅世蓉,冯德益,张国民,等.中国地震预报概论[M].北京:地震出版社,1993.302-320.
[6]胡毅力,许邵永.含硬包体试样破裂孕育过程中应变场的变化特征[J].地震,1997,17(2):162-168.
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