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Seismic records of the 2004 Sumatra and other tsunamis: A quantitative study

机译:2004年苏门答腊和其他海啸的地震记录:定量研究

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Following the recent reports by YUAN et al. (2005) of recordings of the 2004 Sumatra tsunami on the horizontal components of coastal seismometers in the Indian Ocean basin, we build a much enhanced dataset extending into the Atlantic and Pacific Oceans, as far away as Bermuda and Hawaii, and also expanded to five additional events in the years 1995-2006. In order to interpret these records quantitatively, we propose that the instruments are responding to the combination of horizontal displacement, tilt and perturbation in gravity described by GILBERT (1980), and induced by the passage of the progressive tsunami wave over the ocean basin. In this crude approximation, we simply ignore the island or continent structure, and assume that the seismometer functions de facto as an ocean-bottom instrument. The records can then be interpreted in the framework of tsunami normal mode theory,and lead to acceptable estimates of the seismic moment of the parent earthquakes. We further demonstrate the feasibility of deconvolving the response of the ocean floor in order to reconstruct the time series of the tsunami wave height at the surface of the ocean, suggesting that island or coastal continental seismometers could complement the function of tsunameters.
机译:继YUAN等人最近的报道。 (2005年)在2004年苏门答腊海啸在印度洋海盆沿海地震仪的水平分量上的记录中,我们建立了一个大大增强的数据集,延伸到大西洋和太平洋,直至百慕大和夏威夷,还扩展到了五个1995-2006年的其他事件。为了定量解释这些记录,我们建议仪器响应由GILBERT(1980)描述的水平位移,倾斜和重力扰动的组合,并且是由渐进的海啸波在海盆上的传播所引起的。在这种粗略的近似中,我们只是忽略了岛或大陆的结构,并假定地震仪实际上是作为海底仪器使用的。然后可以在海啸正态模式理论的框架内解释这些记录,并得出可接受的母震地震矩估计。我们进一步证明了对海底响应进行反卷积以重建海面海啸波高度的时间序列的可行性,这表明岛屿或沿海大陆地震仪可以补充海啸发声器的功能。

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