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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Volcanic tremor and local earthquakes at Copahue volcanic complex, Southern Andes, Argentina
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Volcanic tremor and local earthquakes at Copahue volcanic complex, Southern Andes, Argentina

机译：阿根廷安第斯山脉南部Copahue火山群的火山地震和局部地震

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摘要

In the present paper we describe the results of a seismic field survey carried out at Copahue Volcano, Southern Andes, Argentina, using a small-aperture, dense seismic antenna. Copahue Volcano is an active volcano that exhibited a few phreatic eruptions in the last 20 years. The aim of this experiment was to record and classify the background seismic activity of this volcanic area, and locate the sources of local earthquakes and volcanic tremor. Data consist of several volcano-tectonic (VT) earthquakes, and many samples of back-ground seismic noise. We use both ordinary spectral, and multi-spectral techniques to measure the spectral content, and an array technique [Zero Lag Cross Correlation technique] to measure the back-azimuth and apparent slowness of the signals propagating across the array. We locate VT earthquakes using a procedure based on the estimate of slowness vector components and S-P time. VT events are located mainly along the border of the Caviahue caldera lake, positioned at the South-East of Copahue volcano, in a depth interval of 1 -3 km below the surface. The background noise shows the presence of many transients with high correlation among the array stations in the frequency band centered at 2.5 Hz. These transients are superimposed to an uncorrelated background seismic signal. Array solutions for these transients show a predominant slowness vector pointing to the exploited geothermal field of "Las Maquinitas" and "Copahue Village", located about 6 km north of the array site. We interpret this coherent signal as a tremor generated by the activity of the geothermal field.
机译：在本文中，我们描述了使用小孔径，密集地震天线在阿根廷南部安第斯山脉的科帕韦火山进行的地震现场调查的结果。科帕胡火山是活跃的火山，在过去的20年中出现了几次潜水爆发。该实验的目的是记录和分类该火山区的背景地震活动，并定位局部地震和火山震源。数据包括几次火山构造（VT）地震以及许多背景地震噪声样本。我们使用普通频谱技术和多频谱技术来测量频谱内容，并使用阵列技术[零滞后交叉相关技术]来测量在阵列中传播的信号的后方位角和明显的慢度。我们使用基于慢度矢量分量和S-P时间估计的程序来定位VT地震。 VT事件主要位于位于Copahue火山东南部的Caviahue火山口湖的边界，其深度在地表以下1 -3 km。背景噪声表明，在以2.5 Hz为中心的频带中，阵列站之间存在许多具有高度相关性的瞬变。这些瞬变叠加在不相关的背景地震信号上。针对这些瞬态的阵列解决方案显示了一个主要的慢度矢量，指向位于阵列站点以北约6公里处的“ Las Maquinitas”和“ Copahue Village”地热场。我们将此相干信号解释为由地热场活动产生的震颤。

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