西北地区新构造运动对青海省地震活动的制约
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摘要
喜山期以来,在印度板块和欧亚板块碰撞作用的影响下,西北地区遭受近南北向强烈挤压,形成一系列活动断裂。通过对晚更新世以来,新构造运动在青藏高原形成的活动断裂带展布的方向,以及青海省的阿尔金断裂两侧、祁连造山带、东昆仑地区区域地壳变形中应力释放和调整与地震震中分布耦合特征的研究,表明青海省NNW向断裂与NWW向断裂相交汇的区段是承受构造挤压作用最强烈,构造几何形态最复杂,构造应力最易集中的部位,成为大地震最易形成和发生的地区,对青海省地震活动具有明显的制约,应是地震预防工作关注的重点地区。
Indian Plate on the south and Eurasian Plate on the north,Northwest region of China have been squeezed together since the Himalayan tectonic movement,while many faults have been formed.The research was based on the study of direction of active faults lied at the Qinghai-Tibet Plateau which were formed in the Neotectonics since the Late Pleistocene epoch,the distribution characteristic of the stress release in the crustal deformation and epicenter of the earthquake on the both side of the Aerjin fault,Qilian Orogenic Belt and Eastern Kunlun.The intersection region of NNW-striking faults and the NWW-striking faults was under the maximum tectonic compression,it showed the most complicated geometric configuration and the formed the stress concentration site,so it can easily result in an earthquake.And precautionary measures must be made in this region.
Indian Plate on the south and Eurasian Plate on the north,Northwest region of China have been squeezed together since the Himalayan tectonic movement,while many faults have been formed.The research was based on the study of direction of active faults lied at the Qinghai-Tibet Plateau which were formed in the Neotectonics since the Late Pleistocene epoch,the distribution characteristic of the stress release in the crustal deformation and epicenter of the earthquake on the both side of the Aerjin fault,Qilian Orogenic Belt and Eastern Kunlun.The intersection region of NNW-striking faults and the NWW-striking faults was under the maximum tectonic compression,it showed the most complicated geometric configuration and the formed the stress concentration site,so it can easily result in an earthquake.And precautionary measures must be made in this region.
引文
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[4]张克信.青藏高原新生代构造岩相古地理演化及其对构造隆升的响应[J].中国地质大学学报:地球科学,2010,35(5):698-719.
[5]周保,彭建兵.青海省活动断裂带分布发育特征研究[J].工程地质学报,2009,17(5):612-619.
[6]周本刚,冉洪流.工程活动断裂鉴定的实现标准讨论[J].工程地质学报,2002,10(3):274-278.
[7]汪昌亮.中国西北地区新构造运动特征及地壳稳定性分析[J].铀矿地质,2008,24(5):268-281.
[8]马寅生,张永双,胡道功,等.玉树地震地表破裂与宏观震中[J].地质力学学报,2010,16(2):115-128.
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