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科技导报  2015 

地震次声波研究——以苏门答腊俯冲带上的大地震为例

DOI: 10.3981/j.issn.1000-7857.2015.08.007, PP. 48-52

Keywords: 苏门答腊地震,俯冲板块,次声波,有限元

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Abstract:

次声监测方法在灾害监测方面得到了越来越广泛的应用,特别是在地震监测领域。大震来临之前1~10d,通常都会接收到次声波异常信号,这种异常信号是由于孕震末期地质体运动引起地表波动而产生的。本文以2004年苏门答腊8.7级大地震为例,观测研究其震前接收到的次声波异常信号,并利用有限元数值模拟方法模拟了次声波异常信号的产生。分析结果表明,苏门答腊大地震发生之前的孕育末期,地质体的动力学行为引起了次声波,次声波的能量主要集中在10-3Hz量级上,研究次声波的异常信号可能为地震预测提供一条有价值的途径。

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