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Title:: Gravity Field and It s Dynamic Evolutional Characteristics in Lanzhou-Tianshui-Wudu Area,Gansu

作者:: 徐云马¹; 2; 祝意青²; 梁伟锋²; 程宏宾²; 刘练²; (1.中国科学技术大学地球和空间科学学院,合肥 230026; 2.中国地震局第二地形变监测中心,西安 710054)

Author(s):: XU Yun-ma¹; 2; ZHU Yi-qing²; LIANG Wei-feng²; CHENG Hong-bin²; LIU Lian²; (1.University of Science and Technology of China,Hefei 230026,China)(2.Second Crust Monitoring and Application Center,CEA,Xian 710054,China)

Keywords:: Lantianwu area; evolution of gravity field; movement of crust; tectonic activity

摘要:: 系统分析了甘肃南部兰州—天水—武都地区2000～2006年期间的流动重力测量资料,研究了该地区重力场的时空动态演化特征。结果表明:重力场变化与该区活动断裂构造密切相关; 重力场有规律的变化与区域应力—应变场的微动态活动有关; 相邻两期重力的动态变化对测区内发生的2003年11月岷县5.2级、2004年9月岷县5.0级地震及测区近邻2006年6月武都、文县间5.0级地震均有较好反映。

Abstract:: The mobile gravity data in Lantianwu area during 2000～2006 is systemically analyzed,and dynamically evolutional characteristics in time and spatial domains of gravity field is researched.From the research results we have had following understandings.The change of gravity field is closely relative to tectonic of active fracture; The change of gravity may be relative to micro-dynamic situation of stress-strain field; The Minxian M_S5.2,M_S5.0 and Wudu M_S5.0 earthquakes are closely relative to the followed two dynamic patterns of gravity field.