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首页> 外文期刊>Izvestiya. Physics of the solid earth >Spatial and Temporal Structure of Global Low-Frequency Seismic Noise
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Spatial and Temporal Structure of Global Low-Frequency Seismic Noise

机译:全球低频地震噪声的空间和时间结构

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The paper aims to study in detail the structure of seismic noise before and after the Sumatra mega-earthquake with M = 9.1 of December 26, 2004. The records by the IRIS seismic stations in different regions of the world, equipped with STS-1 seismometers providing ground motion velocity recording in a broad range of periods from 0.2 to 360 s with the use of standard equipment, form the empirical base of the research. In the records of each station, intervals free of earthquakes, interference from manmade impacts, and noise enhancement due to cyclone propagation were selected. The amplitude of steady seismic noise in the range from 40 to 360 s, not complicated by the recordings of earthquakes and effects of meteorological origin, is in the order of 20 to 40 nm, which characterizes the actual resolution of a broadband seismic station. The noise bursts in the ranges 40-80, 80-160, and 160-320 s differ by the shape and time of occurrence suggesting different sources of their generation. The absence of the correlation between the noise recordings at the neighboring seismic stations spaced 10(2)-10(3) km apart indicates the influence of local processes. The noise reflects turbulent processes in the Earth's atmosphere, whereas the exponential growth of the noise with the increase of the oscillation period is consistent with A.N. Kolmogorov's theory of locally isotropic turbulence in the atmosphere. The noise amplitude after the Sumatra mega-earthquake with M = 9.1 of December 26, 2004 increased by a factor of 1.5-2 in January 2005 compared to January 2004, irrespective of the location of the seismic station.
机译:本文旨在详细研究苏门答腊霸王地震前后地震噪声的结构,苏门答腊大地震与2004年12月26日的M = 9.1。世界不同地区的虹膜地震车站的记录,配备了STS-1地震仪在0.2至360秒的范围内提供地面运动速度记录,使用标准设备,形成了研究的实证基础。在每个站的记录中,选择了没有地震的间隔,来自Manady撞击的干扰,以及由于旋风传播引起的噪声增强。稳定地震噪声的幅度范围为40至360秒,不受地震录制的复杂性和气象来源的影响,大约为20至40nm,其特征是宽带地震站的实际分辨率。范围40-80,80-160和160-320s中的噪声突发因其产生的不同来源的出现而异。邻近地震站的噪声记录与间隔10(2)-10(3)km的噪声记录之间的相关性表明了局部过程的影响。噪音反映了地球大气中的湍流过程,而随着振荡周期的增加,噪声的指数增长与A.N一致。 Kolmogorov在大气中局部各向同性湍流的理论。 2004年12月26日的M = 9.1的苏门答腊巨大地震后噪声幅度增加了2005年1月的1.5-2倍,与2004年1月,无论地震站的位置如何。

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