合肥台短水准异常与周边地震活动分析
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摘要
以合肥台跨郯庐断裂短水准数据为基础,结合华东地区中强震及安徽地区小震释放能量分析了历史测量资料在地震期间的变化,研究了辅助资料对测量资料的影响,得出:(1)降水虽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的前兆意义。(2)华东地区中强地震、安徽地区小震(群)与合肥台断层形变存在一定的相关性,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。3)2006年以来的断层持续东倾反映出所跨断层活动性质由张性转为压性,是可信的趋势性异常。
In this paper,the characteristics of fault deformation evolution was analyzed based on the cross-fault leveling data of Hefei Seismic Station during earthquake of its surrounding area,and the cross-fault leveling data influenced by assisting observation data also have been studied.The conclusions are as follows:1) though the rainfall can lead to the fault deformation,the fault deformation anomalies still have precursory significance to some degree when the regional stress have intensity effect on the fault.2) Moderately strong earthquakes in East China and small earthquakes in Anhui area have certain relations with the cross-fault deformation of Hefei Seismic Station.If the fault trend to a direction continues for several months,small earthquakes(or earthquake) of its surrounding area will be enhanced.The data can reflect the change of regional stress field because of differences between data and the epicentrum orientation.3) Eastward tilt reflects the characteristic of fault activity from tension change into compressive since 2006.It can be considered as trusted trend anomaly.
In this paper,the characteristics of fault deformation evolution was analyzed based on the cross-fault leveling data of Hefei Seismic Station during earthquake of its surrounding area,and the cross-fault leveling data influenced by assisting observation data also have been studied.The conclusions are as follows:1) though the rainfall can lead to the fault deformation,the fault deformation anomalies still have precursory significance to some degree when the regional stress have intensity effect on the fault.2) Moderately strong earthquakes in East China and small earthquakes in Anhui area have certain relations with the cross-fault deformation of Hefei Seismic Station.If the fault trend to a direction continues for several months,small earthquakes(or earthquake) of its surrounding area will be enhanced.The data can reflect the change of regional stress field because of differences between data and the epicentrum orientation.3) Eastward tilt reflects the characteristic of fault activity from tension change into compressive since 2006.It can be considered as trusted trend anomaly.
引文
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[13]马杏垣.中国岩石圈动力学图集[M].北京:中国地图出版社,1989.
[2]曾广梁.地壳形变测量与地震[J].地壳形变与地震, 1981,(1):2-3.
[3]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.
[4]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.
[5]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.
[6]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.
[7]薄万举,李延光,杨国华,等.滨海附近地区GPS和断层形变与地震关系研究[J].华北地震科学,1999,17 (2):66—71.
[8]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.
[9]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[A].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.
[10]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.
[11]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.
[12]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.
[13]马杏垣.中国岩石圈动力学图集[M].北京:中国地图出版社,1989.
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