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《Earth Science(Journal of China University of Geosciences)》 2014-12
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Observation of Local Infrasound Coupled by Seismic Wave on Wide Spread Infrasound Network

Guo Quan;Yang Yichun;LüJun;Teng Pengxiao;Institute of Acoustics,Chinese Academy of Sciences;University of Chinese Academy of Sciences;  
A kind of least-square-error localization algorithm applied on wide spread infrasound network is proposed in this article.Models of cross correlation between distant sensors and atmosphere infrasound propagation are analyzed.The localization error caused by quantity and distribution structure of network and ray tracing of local infrasound in real atmosphere are also calculated.Infrasound coupled by local seismic Rayleigh wave of Lushan(Yaan)earthquake on April 20 th,2013is detected by infrasound network and could prove the algorithm and analysis above.Comparing infrasound signals with seismic recording of IRIS global network,we find that they ware well correlated for the corresponding time period in signal travel time,signal correlation(0.6-0.9),particle motion trajectory analysis,etc..The zone of infrasound source calculated by the least-square-error localizing algorithm is not compact but its center(minimum value determined by least-square-error method)is less than 150 km distant from the epicenter.Due to the less absorption and refraction in atmosphere propagation,local infrasound is easily detected and recognized and could be a possible and feasible way to monitor earthquake and relationship between ground motion and pressure perturbation in atmosphere.
【Fund】: 国家自然科学基金面上项目(Nos.11074278 11174320)
【CateGory Index】: P315.6
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