【摘要】 提出了一个临震次声波产生的机理模型,认为孕震末期地质结构动力行为引起的地表变形与空气耦合运动导致可观测次声波．并以日本地震板块为研究对象,建立其数值模型,采用二维瞬态有限元分析方法,分层考虑不同深度地质参数,模拟了日本东北部地区地表的运动,计算了地表位移及次声波压力变化曲线,模拟出了临震次声波,次声信号波形特征、频率范围与实际观测基本一致,结果表明孕震一次声机理模型是合理的．更多还原

【Abstract】 A mechanism model of infrasound producing in earthquake incubating was proposed, in which interaction between atmosphere and deformation of Earth surface generated by dynamic behavior of geologic bodies in the final stage of earthquake incubation causes the observable infrasound. As an example to verify the model of geological behavior an earthquake in the Northeast area of Japan was modeled numerically and analyzed by two dimensional finite element method (FEM). A layer geological model and effect of the Pacific subducting plate were included in the numerical model. Based on the dynamic coupling theory between structures and fluids, infrasound was obtained by numerical simulations. Good agreement between the observed and the simulated suggests that the proposed model is reasonable.更多还原