雅江6.0级地震前后的重力变化异常特征
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摘要
对川西地区2000～2001年雅江—康定间6 0级地震前后的重力观测资料进行了处理,绘制了重力场变化等值线图和三维曲面图,从动态的观点研究了雅江地震前后重力场的图像变化特征。结果表明:①重力变化与构造环境变化有关,地震前重力场有明显的异常变化。②雅江地震前后重力场空间分布图较好地反映了鲜水河断裂带及北西向的理塘断裂和北东的玉龙西断裂构造活动引起的重力变化。③地震发生在重力异常下降区及高梯度带附近。
The gravity field observation data in the western regions of Sichuan from 2000 to 2002 are processed and the three-dimension chart and contour chart are mapped.During this period,an M6.0 earthquake occurred between Yajian and Kangding counties.Our analyses show that the gravity changes are clear before and after the earthquake and related to the geological structures.The gravity changes result from the activities of two branch faults,Litang and western Yilong,belong to the big faults of Xianshuihe.The Yajianh M6.0 Earthquake occurred near the position of high gradient lines.
The gravity field observation data in the western regions of Sichuan from 2000 to 2002 are processed and the three-dimension chart and contour chart are mapped.During this period,an M6.0 earthquake occurred between Yajian and Kangding counties.Our analyses show that the gravity changes are clear before and after the earthquake and related to the geological structures.The gravity changes result from the activities of two branch faults,Litang and western Yilong,belong to the big faults of Xianshuihe.The Yajianh M6.0 Earthquake occurred near the position of high gradient lines.
引文
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[3] 张赤军.断层活动引起的重力效应[J].地壳形变与地震.1994(1):9-16.
[4] 何玉林,等.2001年2月23日四川省雅江—康定6 0级地震宏观烈度考察及发震构造背景刍议[J].四川地震,2001,(4):4-8
[2] 祝意青.北祁连地区震前重力场变化特征[J].地壳形变与地震,1996,(2):58-62.
[3] 张赤军.断层活动引起的重力效应[J].地壳形变与地震.1994(1):9-16.
[4] 何玉林,等.2001年2月23日四川省雅江—康定6 0级地震宏观烈度考察及发震构造背景刍议[J].四川地震,2001,(4):4-8
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