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临震次声异常产生的机理研究

Keywords: 地震,次声波,有限元

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Abstract:

为研究观测到的震前次声异常,提出了强地震发生前次声波异常信号产生的机理模型.该模型采用膨胀扩容孕震理论,将大气对流层与地质体作为一个动力学系统,采用瞬态有限元模拟方法计算分析了孕震末期地表变形及其产生的次声波和频率.结果表明,该模型的确能在空气中产生次声波,且次声波的主要频率是孕震体膨胀一收缩时间周期的倒数;孕震体收缩变形阶段产生的声压波幅远大于膨胀阶段.

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