| 河西地区重力场及其动态演化特征 |
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| 引用本文： | 祝意青,胡斌,朱桂芝,操启明.河西地区重力场及其动态演化特征[J].大地测量与地球动力学,2003,23(4):44-48. |
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| 作者姓名： | 祝意青 胡斌 朱桂芝 操启明 |
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| 作者单位： | 中国地震局第二地形变监测中心,西安,710054 |
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| 基金项目： | 中国地震局“十五”重点科研项目“强震中期预测” |
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| 摘 要： | 系统分析了河西地区1992～2001年流动重力测量资料，研究了重力场的时空动态演化特征。结果表明:地震孕育发生阶段，重力场出现一定范围的区域性重力异常：震前震后重力变化所反映的构造活动含义不同；重力场变化与断裂活动密切相关，特别是跨断裂的重力变化能较好地反映断层活动特征；重力场变化与区域应力应变场微动态活动及地震活动有关。
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| 关 键 词： | 河西地区 重力场 动态演化 地壳运动 构造活动 地震活动 |
| 文章编号： | 1671-5942(2003)04-0044-05 |
| 修稿时间： | 2003年3月8日 |
STUDY ON GRAVITY FIELD AND ITS DYNAMICALLY EVOLUTIONAL CHARACTERISTICS IN HEXI AREA |
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| Zhu Yiqing,Hu Bin,Zhu Guizhi and Cao Qiming.STUDY ON GRAVITY FIELD AND ITS DYNAMICALLY EVOLUTIONAL CHARACTERISTICS IN HEXI AREA[J].Journal of Geodesy and Geodynamics,2003,23(4):44-48. |
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| Authors: | Zhu Yiqing Hu Bin Zhu Guizhi and Cao Qiming |
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| Abstract: | The mobile gravity data in Hexi area is systematically analyzed, and the dynamically evolutional characteristics in time and spatial domains of gravity field are researched.From the research results we have had following understandings.(1)In seismogenic stage, there is obviously regional gravity anomaly in a certain area of Hexi region, which is related to seismogenic process.(2)The different gravity variations before and after event reflect different tectonic activities. Before earthquake, it reflects the stress concentration in the seismogenic layer;after earthquake, it mirrors the movement of active fault in upper layer of crust.(3)The change of gravity field is closely relative to tectonic of active fault, which is coincident with the concentration zone of non-tidal change of gravity. It shows that the fault tectonic is active.(4)Small change of gravity corresponds obviously with seismisity, and it may be relative to micro-dynamic situation of stress-strain field. |
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| Keywords: | evolution of gravity field crustal movement tectonic activity seismisity |
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