Atmospheric pressure change associated with the 2003 Tokachi‐Oki earthquake
Atmospheric pressure change associated with the 2003 Tokachi‐Oki earthquake
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DOI：
10.1029/2006gl027967
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发表时间：
2006-12
影响因子：
5.2
通讯作者：
S. Watada;T. Kunugi;K. Hirata;H. Sugioka;Kiwamu Nishida;S. Sekiguchi;J. Oikawa;Y. Tsuji;H. Kan
中科院分区：
文献类型：
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作者：
S. Watada;T. Kunugi;K. Hirata;H. Sugioka;Kiwamu Nishida;S. Sekiguchi;J. Oikawa;Y. Tsuji;H. Kan
分布在日本的微气压计记录了与2003年日本十胜冲地震（Mw 8.3）相关的明显大气压力变化。压力的变化开始于地震波的到来，并在瑞利波的到来时达到其最大幅度，这表明所观察到的压力变化是由地震波通过现场的地面运动驱动的。我们计算了地震-压力传递函数（即，压力变化与垂直地面运动速度的频谱比），时间间隔为10至50 s，来自同位置气压计和地震仪记录。比较所观察到的传递函数与理论的一个，包括有限的频率和波长效应的重力分层等温大气证实，所观察到的振幅和相位的压力变化的解释由大气和地面之间的声耦合的传感器下面。
Clear atmospheric pressure changes associated with the 2003 Tokachi‐Oki, Japan, earthquake with Mw 8.3 were recorded with the microbarographs distributed in Japan. The pressure change starts at the arrival of seismic waves and reaches its maximum amplitude at the arrival of Rayleigh waves, suggesting that the observed pressure change was driven by the ground motion of seismic waves passing by the site. We computed the seismic‐to‐pressure transfer function (i.e., the spectral ratio of the pressure change to the vertical ground motion velocity) for periods between 10 to 50 s from the co‐located barograph and seismograph records. Comparison of the observed transfer function with the theoretical one including the finite frequency and wavelength effects for a gravitationally stratified isothermal atmosphere confirms that the observed amplitude and phase of the pressure change are explained by the acoustic coupling between the atmosphere and the ground just beneath the sensors.