| 青藏高原东北侧断层活动引起的地壳三维变形与重力场变化研究 |
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| 引用本文： | 张永志,王卫东,祝意青,徐云玛.青藏高原东北侧断层活动引起的地壳三维变形与重力场变化研究[J].地球学报,2004,25(5):583-586. |
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| 作者姓名： | 张永志 王卫东 祝意青 徐云玛 |
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| 作者单位： | 长安大学地质工程与测绘工程学院，陕西西安，710054;长安大学地质工程与测绘工程学院，陕西西安，710054;中国地震局第二监测中心，陕西西安，710054;中国地震局第二监测中心，陕西西安，710054 |
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| 基金项目： | 国家自然科学基金(批准号:49774214)，国家重大科学工程资助项目 |
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| 摘 要： | 本文推导了断层活动与地面重力变化的理论关系，讨论了与断层活动有关的三维形变场变化与实际观测的重力变化之间的关系。利用位错理论模型模拟了青藏高原东北侧的多组断层活动引起的地壳三维变形与重力场变化分布。并结合该地区2001年11月14日昆仑山Ms8．1地震前观测的两期重力资料，讨论了该地区的地质构造活动与重力变化过程与地震活动的关系。
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| 关 键 词： | 断层活动 三维变形 重力变化 地震活动 |
Gravity Variation and Three-Dimensional Deformation in the Northeastern Margin of Tibetan Plateau |
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| ZHANG Yong-zhi,WANG Wei-dong,ZHU Yi-qing and XU Yun-ma.Gravity Variation and Three-Dimensional Deformation in the Northeastern Margin of Tibetan Plateau[J].Acta Geoscientia Sinica,2004,25(5):583-586. |
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| Authors: | ZHANG Yong-zhi WANG Wei-dong ZHU Yi-qing and XU Yun-ma |
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| Institution: | Department of Geological and Surveying Engineering, Chang an University, Xi'an, Shaanxi, 710054;Department of Geological and Surveying Engineering, Chang an University, Xi'an, Shaanxi, 710054;No.2 Monitoring Center, China Seismological Bureau, Xi'an, Shaanxi, 710054;No.2 Monitoring Center, China Seismological Bureau, Xi'an, Shaanxi, 710054 |
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| Abstract: | In this paper, the formula for expressing gravity variation due to fault movement is deduced and the relationship between the deformation field resulting from fault movement and the observed gravity variation is discussed. The crustal deformation and gravity distribution caused by several sets of fault movement in the northeastern margin of Tibet where Kunlun M s=8.1 strong earthquake had occurred on 14 November 2001 were calculated and simulated by numerical method with the dislocation model. The computed results from the dynamic model of East Kunlun fault and Altyn Tagh fault were compared with the gravity variation observed in the period from October 1998 to November 2001. Moreover, the relationships of the earthquake activity to the tectonic activity and gravity variation are discussed. |
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| Keywords: | fault movement three-dimensional deformation gravity variation earthquake activity |
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