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首页> 外文期刊>Journal of Volcanology and Geothermal Research2012V243-244NOCT,15 >The whisper of the hydrothermal seismic noise at Ischia Island
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The whisper of the hydrothermal seismic noise at Ischia Island

机译：伊斯基亚岛热液地震噪声的耳语

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This work is devoted to the study of the background seismic noise at Ischia Island. We highlight two persistent independent signals, with dominant frequency peaks in the range 1-2 Hz and 3-4 Hz, respectively.The first signal is the most energetic and persistent and its polarization properties are well defined, revealing a shallow propagation likely controlled by both tectonic/volcanic structures and morphological features..This signal is well correlated at all the stations in the Casamicciola area and its group velocity is estimated as 500-600m/s.The second signal shows similar polarization properties but the temporal pattern of its amplitude is strongly affected by anthropogenic noise, revealing a modulation on a diurnal scale. On the investigated spatial scales, any clearly correlated signal is not evidenced.We interpret the 1-2 Hz correlated wave-packets as the persistent whisper of the shallow circulation of fluids, which are a mixing of sea and meteoric water and thermal fluids of the hydrothermal reservoir. In the conceptual scheme of the self-sustained musical instruments, we hypothesize that the solid structure of the shallow hydrothermal system of Ischia is formed by a network of channels, continuously excited by the circulating hydrothermal fluids, which produce a whispered sound (i.e. the seismic noise). This mechanism is able to produce persistent self-sustained oscillations that we observe as the 1-2 Hz seismic signal and, eventually, higher modes. (C) 2019 Elsevier B.V. All rights reserved.
机译：这项工作致力于研究伊斯基亚岛的背景地震噪声。我们突出显示了两个持久的独立信号，其主频峰值分别在1-2 Hz和3-4 Hz范围内。第一个信号是最有活力和持久性的，并且其极化特性得到了很好的定义，表明可能受信号控制的浅传播该信号在卡萨米乔拉地区的所有站点都具有良好的相关性，其群速度估计为500-600m / s。第二个信号显示出相似的极化特性，但幅度的时间模式受到人为噪声的强烈影响，揭示了昼夜尺度的调制。在研究的空间尺度上，没有证据表明有任何明显相关的信号。我们将1-2 Hz相关的波包解释为流体浅层循环的持续低语，这是海水，流水和热流体的混合体。热液储层。在自持乐器的概念方案中，我们假设伊斯基亚岛浅层热液系统的固体结构由通道网络形成，这些通道网络不断被循环的热液流体激发，并产生耳语声（即地震声）。噪声）。这种机制能够产生持续的自持振荡，我们观察到这种振荡是1-2 Hz地震信号，最终是更高的模式。 （C）2019 Elsevier B.V.保留所有权利。

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