| 鄂尔多斯地块的运动特性与现今地震活动性 |
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| 引用本文： | 高立新,韩晓明,戴 勇,李 娟,杨红缨.鄂尔多斯地块的运动特性与现今地震活动性[J].大地测量与地球动力学,2017,37(4):349-354. |
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| 作者姓名： | 高立新 韩晓明 戴 勇 李 娟 杨红缨 |
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| 摘 要： | 鄂尔多斯地块现今水平运动是鄂尔多斯地块本身运动与中国大陆整体运动相互叠加的结果，其动力来源主要受到青藏地块的北东向推挤、地块北缘的北西向拉张。最新的GPS速度场观测表明，鄂尔多斯地块及周缘1999～2015速度场随着时间推移发生明显变化，其东北缘、西北缘、西南缘、东南缘的速度场变化较为显著，南北缘的左旋运动速率远大于东西缘的右旋运动速率。1970年以来鄂尔多斯地块现今地震资料显示的地震活动性、应变积累释放、应力空间分布及其应力场分析结果表明，鄂尔多斯地块北缘是地块周缘乃至华北地区中强地震的主体活动区域，2000年以来地块周缘能量持续积累，是1970年以来能量积累最长的一个时段。2015年阿拉善左旗5.8级地震后，地块周缘的能量出现预释放的迹象，鄂尔多斯地块北缘具有高的应力分布异常区域。
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| 关 键 词： | 鄂尔多斯地块 运动特性 动力来源 地震 活动性 |
Movement Characteristics and the Present Seismic Behavior of the Ordos Block |
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| GAO Lixin,HAN Xiaoming,DAI Yong,LI Juan,YANG Hongying.Movement Characteristics and the Present Seismic Behavior of the Ordos Block[J].Journal of Geodesy and Geodynamics,2017,37(4):349-354. |
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| Authors: | GAO Lixin HAN Xiaoming DAI Yong LI Juan YANG Hongying |
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| Abstract: | The present horizontal movement characteristics of the Ordos block is the result of the interaction between the Ordos block movement itself and the whole movement of the mainland of China. The power source of Ordos block is mainly by push from the Qinghai-Tibet block from a NE direction, and the NW extension of the northern margin of the block. The latest GPS velocity field observational evidence from 1999 to 2015 shows that the resultant changeis significant. The velocity field change is more significant in the northeast, northwest, southwest and southeast margins of the block; the left lateral movement speed of the north and south margin is much larger than the right lateral movement speed of the east and the south marginsof the Ordos block. Seismic activity, strain accumulation and release, stress distribution and stress field analysis using the present seismic data since 1970,show that the northern margin of the Ordos block is the main region of strong earthquake activity; this is not only at the block edge, but also in north China. The energy around the Ordos block has accumulated continuously since 2000.This is the longest period since 1970, until the Alashanzuoqi 5.8 earthquake in 2015. The periphery of the block has shown signs of pre-release energy, and there is an abnormal area of stress distribution in the north margin of the Ordos block. |
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| Keywords: | Ordos block movement characteristics power source earthquake activity behavior |
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