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首页> 外文期刊>Journal of Volcanology and seismology >An Analysis of Precursory Phenomena for the 2012-2013 Tolbachik Fissure Eruption: Seismicity Parameters and Crustal Strain as Inferred from Data Supplied by the System of Multidisciplinary Monitoring of Volcanic Activity in Kamchatka
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An Analysis of Precursory Phenomena for the 2012-2013 Tolbachik Fissure Eruption: Seismicity Parameters and Crustal Strain as Inferred from Data Supplied by the System of Multidisciplinary Monitoring of Volcanic Activity in Kamchatka

机译：堪察加火山活动多学科监测系统提供的数据推论出的2012-2013年托尔巴奇克裂缝爆发的前兆现象：地震参数和地壳应变

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摘要

This paper is concerned with ground deformation and seismicity prior to the Tolbachik Fissure Eruption, which began in Kamchatka on November 27, 2012. Seismic and GPS data were analyzed to reveal synchronous precursory anomalies in crustal deformation and seismicity that lasted approximately 4 months (August to November 2012). The seismic anomaly was a statistically significant increase of seismicity with low energy (mostly K-S = 4-6) beneath the Ploskii Tolbachik Volcano edifice at depths of less than 5 km. The rates of seismicity and seismic energy release were exceeded by factors of approximately 40 compared with the 2000-2011 mean values during the 2 to 3 weeks immediately before the eruption. The strain anomalies were observed as movements in the middle of the Klyuchevskoy volcanic group: a radial (relative to the eruption) compression and an extension in the tangential direction. The strain had reached similar to 10(-7) by the beginning of the eruption. The durations of the seismic and strain anomalies were comparable in value (similar to 4 months before the eruption), thus providing evidence of a common origin. We can classify them as belonging to the same time scale of precursors (the intermediate-term in the accepted terminology).
机译：本文涉及2012年11月27日在堪察加开始的托尔巴奇克裂隙爆发之前的地面变形和地震活动。分析了地震和GPS数据，揭示了持续约4个月（8月至8月）的地壳变形和地震活动的同步先兆异常。 2012年11月）。在低于5 km的深度，Ploskii Tolbachik火山大厦下方的低能量（大部分为K-S = 4-6）时，地震异常是地震活动的统计显着增加。与爆发前2到3周的2000-2011年平均值相比，地震活动性和地震能量释放率超出了约40倍。观察到应变异常是在Klyuchevskoy火山群中部的运动：径向（相对于喷发）压缩和切向方向扩展。到喷发开始时，应变已达到类似于10（-7）的水平。地震和应变异常的持续时间在价值上是可比较的（类似于喷发前的四个月），因此提供了共同起源的证据。我们可以将它们归类为属于同一时间范围的前体（公认术语中的中间术语）。

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