2011年 第13卷 第4期
震前特大地磁异常及其短临预警意义
1. 益正科技震磁关系研究课题组，北京100192；
2. 中国地震局地球物理研究所，北京100081；
3. E-Right Research Company, Los Angeles CA91731, USA
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摘要
对地磁记录分析的结果显示，大地震前强烈的地磁异常现象反复出现；在震中附近极震区临震前36 h至十几分钟，地磁场的特大异常数值随震级增大而增大。归算到距震中1 km处，Ms=6.0～9.5 级破坏性地震的磁场异常值约为102～105 nT，异常强度甚至超过地球磁场量级5.5×104 nT。根据其强度特性及时空分布，这种临震前在震中附近的ULF磁场异常，表现为一种“磁间隙喷发”。由此地磁异常的特性，提出利用大地震前短临地磁异常作为预警信号进行防震预警的探讨，由地磁预警突破目前地震预测预报难的现实困境，有望收到
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