合肥地震台短水准异常与周边地震活动分析
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摘要
以合肥地震台跨断层短水准数据,结合地区小震释放能量,分析历史测量资料在地震期间的变化,并研究辅助资料对测量资料的影响,得出:①降水可能造成敏感地块的断层形变异常,但在区域应力作用断层到一定强度时,断层形变异常仍具有一定前兆意义;②安徽地区小震释放能量与合肥地震台断层形变存在一定相关性,断层活动连续几个月持续拉张或挤压,在近区常有地震(或小震群)对应较好,由于资料对应地震的震中方位的差异,说明资料可以反映区域应力场的变化。
In this paper,the characteristics of fault deformation evolution was analyzed based on the cross-fault leveling data of Hefei Seismic Station during earthquake occurring in its surrounding area,and the cross-fault leveling data influenced by assist observation data also have been studied.The conclusions are as follows:1)though the rainfall can lead to the fault deformation, the fault deformation anomaly still have precursory significance in some degree when the regional stress have intensity effect on the fault.2)the release energy of small earthquake of its surrounding area have relations with the cross-fault deformation,if the fault trend to a direction for several months,small earthquakes(or earthquake)activity in its surrounding area will be enhance.The data can reflect the regulation of regional stress field because of difference between data and the epicentral azimuth.
In this paper,the characteristics of fault deformation evolution was analyzed based on the cross-fault leveling data of Hefei Seismic Station during earthquake occurring in its surrounding area,and the cross-fault leveling data influenced by assist observation data also have been studied.The conclusions are as follows:1)though the rainfall can lead to the fault deformation, the fault deformation anomaly still have precursory significance in some degree when the regional stress have intensity effect on the fault.2)the release energy of small earthquake of its surrounding area have relations with the cross-fault deformation,if the fault trend to a direction for several months,small earthquakes(or earthquake)activity in its surrounding area will be enhance.The data can reflect the regulation of regional stress field because of difference between data and the epicentral azimuth.
引文
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周必才,王雪莹,顾乃根,等.合肥形变台跨郯庐断裂短水准异常研究[J].地震地磁观测与研究,2007,28(2) :65-68．
周硕愚,等.形变大地测量学的进展、问题与地震预报[J].大地测量与地球动力学,2004,24(4) ;95-101．
薄万举.苏鲁皖断层形变显的区域地壳活动新特征[J].地震地质,1997,19(2) :148-154．
傅承义.地壳形变与地震[J].地壳形变与地震,1981,(1) :1．
郭良迁.华北地区主要构造带的现代运动和应变[J].国际地震动态,2007,343(7) :68-75．
郭良迁.华北地区断层形变异常强度与地震的关系[J].灾害学,2008,23(4) :11-16．
黄立人.郯庐断裂带中段水平形变的初步分析[J].地壳形变与地震,1981,(1) :25-42．
李群芳,等.单断裂周围的三维应力场与形变场[J].地壳形变与地震.1982,2(1) :78-85．
刘东旺,刘泽民,沈小七,等.汶川8． 0地震后郯庐带中南段地震危险性研究[J].国际地震动态,2009,(4) :85．
刘序俨,杨军,等.地壳形变分析预报方法[M].北京:地震出版社,1998．
陆明勇,牛安福,周峥嵘,等.强震中短期阶段断层活动时空演化特征的讨论[J].地震,2003,23(4) :1-9．
吕弋培,李铁明.鲜水河断裂带跨断层形变测量及其他地震学意义[J].地震地质,1997,19(1) :333-340．
马杏垣.中国岩石圈动力学图集[M].北京:中国地图出版社,1989．
牛安福,张晶,高福旺,等.地壳持续加速变形与地震关系研究[J].大地测量与地球动力学,2002,22(1) :29 33．
曾广梁.地壳形变测量与地震[J].地壳形变与地震,1981,(1) :2-3．
张超,陈连旺.我国大陆断层现代形变与地震活动关系的研究//地震短临预报的理论与方法--“八五”攻关三级课题论文集[C].北京:地震出版社,1997．
张燕,吴云,刘永启,等.小波分析在地壳形变资料处理中的应用[J].地震学报,2004,26(增):103-109．
周必才,王雪莹,顾乃根,等.合肥形变台跨郯庐断裂短水准异常研究[J].地震地磁观测与研究,2007,28(2) :65-68．
周硕愚,等.形变大地测量学的进展、问题与地震预报[J].大地测量与地球动力学,2004,24(4) ;95-101．
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