| 大同5.6级地震前后的重力场变化和深部动力学过程 |
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| 引用本文： | 李清林,秦建增. 大同5.6级地震前后的重力场变化和深部动力学过程[J]. 大地测量与地球动力学, 2001, 21(4): 43-51 |
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| 作者姓名： | 李清林 秦建增 |
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| 作者单位： | 中国地震局地球物理勘探中心, |
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| 基金项目： | 中国地震局责任包干制项目 (华北地区流动重力复测与地震预报 ) |
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| 摘 要： | 详细讨论了大同 5 .6级地震前后重力场变化 ,并结合该区地震活动性、地震地质特征、地壳深部构造特征等资料 ,对该区深部动力学过程进行了探讨。认为 :地震前后 ,该区出现了明显、大范围的重力场变化 ;产生这种变化的原因是该区地壳深部的低速 -高导块体在应力不断的作用下 ,其塑性物质沿深大断裂上涌和侧向运移 ,中下地壳间发生层间水平滑移 ,导致密度发生变化而引起重力场变化
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| 关 键 词： | 大同地震 重力异常 地震活动性 |
| 修稿时间： | 2001-03-26 |
GRAVITY VARIATIONS BEFOR & AFTER DATONG EARTHQUAKE (M5.6) AND ITS DYNAMIC PROCESS |
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| Li Qinglin and Qin Jianzeng. GRAVITY VARIATIONS BEFOR & AFTER DATONG EARTHQUAKE (M5.6) AND ITS DYNAMIC PROCESS[J]. Journal of Geodesy and Geodynamics, 2001, 21(4): 43-51 |
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| Authors: | Li Qinglin and Qin Jianzeng |
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| Abstract: | In this paper the gravity variations before and after Datong earthquake ( M 5.6) and its deep dynamic process are discussed in association with the seismic activity, the seismic geology features and the deep structure of crust in this area. This research leads to following conclusions: before and after the earthquake the clear gravity variations occurred in wide range of Datong and its adjacent areas. The gravity variations may be attributed to that the weakly and plastic materials in the block of low velocity and high conduct of the mid crust moved up and sideways along some deep and large fault and the horizontal slip occurred between the middle and lower crusts. |
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| Keywords: | Datong earthquake gravity anomaly seismic activity |
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