沂沭带形变、重磁场时空变化特征与地震活动
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摘要
综合利用流动水准和流动重磁复测资料 ,分析沂沭断裂带上地壳形变场和地球物理场的时空强变化特征 ,揭示沂沭断裂带活动特征是以鲁中隆起的继承性活动为主 ,沂沭带北端的双山—李家庄断裂两盘的垂直形变受区域断裂控制并与区域地震活动有关 ,与 1983年菏泽地震和 1995年苍山地震有较好对应关系 ;沂水附近地磁场有“窗口效应” ,尤其与南黄海地震活动及沂沭断裂带上的小震活动有关。
With the analysis of vertical leveling, geomagnetic and precise gravity data on the Yishu fault zone, the geophysical characteristic of the field is discussed. It shows that the vertical deformation tendency was dominated by the continuous upheaval of Luzhong territory but had been interrupted by the Heze earthquake in 1983 and the Cangshan earthquake in 1995. This is obviously detected across the Shangsha-Lijiiazhuang fault located at the north end of the Yishu fault zone. The earths local magnetic field nearby Yishui territory has changes as“window effect”, which corresponds the seismological activities in south Huanghai and the small events on the Yishu fault zone.
With the analysis of vertical leveling, geomagnetic and precise gravity data on the Yishu fault zone, the geophysical characteristic of the field is discussed. It shows that the vertical deformation tendency was dominated by the continuous upheaval of Luzhong territory but had been interrupted by the Heze earthquake in 1983 and the Cangshan earthquake in 1995. This is obviously detected across the Shangsha-Lijiiazhuang fault located at the north end of the Yishu fault zone. The earths local magnetic field nearby Yishui territory has changes as“window effect”, which corresponds the seismological activities in south Huanghai and the small events on the Yishu fault zone.
引文
〔1〕李杰 ,燕乃玲 ,冯志军 沂沭断裂带垂直形变特征与异常分析 地震学刊 ,1998,( 2 ) :10～ 16
〔2〕郭玉莲等 鲁南地区地磁场近期变化与地震活动关系的研究 地震研究 ,1997,2 0 ( 2 ) :2 86～ 2 91
〔3〕魏光兴等 郯庐带地震活动性研究 北京 :地震出版社 1993
〔2〕郭玉莲等 鲁南地区地磁场近期变化与地震活动关系的研究 地震研究 ,1997,2 0 ( 2 ) :2 86～ 2 91
〔3〕魏光兴等 郯庐带地震活动性研究 北京 :地震出版社 1993
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