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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Magma migration at the onset of the 2012-13 Tolbachik eruption revealed by Seismic Amplitude Ratio Analysis
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Magma migration at the onset of the 2012-13 Tolbachik eruption revealed by Seismic Amplitude Ratio Analysis

机译:地震振幅比分析揭示2012-13 Tolbachik火山爆发时的岩浆迁移

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In contrast of the 1975-76 Tolbachik eruption, the 2012-13 Tolbachik eruption was not preceded by any striking change in seismic activity. By processing the Klyuchevskoy volcano group seismic data with the Seismic Amplitude Ratio Analysis (SARA) method, we gain insights into the dynamics of magma movement prior to this important eruption. A clear seismic migration within the seismic swarm, started 20 hours before the reported eruption onset (05:15 UTC, 26 November 2012). This migration proceeded in different phases and ended when eruptive tremor, corresponding to lava flows, was recorded (at similar to 11:00 UTC, 27 November 2012). In order to get a first order approximation of the magma location, we compare the calculated seismic intensity ratios with the theoretical ones. As expected, the observations suggest that the seismicity migrated toward the eruption location. However, we explain the pre-eruptive observed ratios by a vertical migration under the northern slope of Plosky Tolbachik volcano followed by a lateral migration toward the eruptive vents. Another migration is also captured by this technique and coincides with a seismic swarm that started 16-20 km to the south of Plosky Tolbachik at 20:31 UTC on November 28 and lasted for more than 2 days. This seismic swarm is very similar to the seismicity preceding the 1975-76 Tolbachik eruption and can be considered as a possible aborted eruption. (C) 2015 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
机译:与1975-76年的Tolbachik火山喷发相比,2012-13的Tolbachik火山喷发并未发生地震活动的任何显着变化。通过使用地震振幅比分析(SARA)方法处理Klyuchevskoy火山群地震数据,我们可以了解到在这一重要喷发之前的岩浆运动动力学。在报告的喷发开始前20小时(2012年11月26日世界标准时间05:15),地震群内开始了明显的地震迁移。此迁移过程分不同阶段进行,并在记录到对应于熔岩流的爆发性震颤时结束(与世界协调时间2012年11月27日11:00相似)。为了获得岩浆位置的一阶近似,我们将计算出的地震烈度比与理论值进行了比较。正如预期的那样,观察结果表明地震活动性向喷发位置迁移。但是,我们通过在Plosky Tolbachik火山北坡下的垂直迁移然后向着喷口的横向迁移来解释喷发前的观测比率。这项技术还捕获了另一次迁移,这与地震群相吻合,该地震群于11月28日世界标准时间20:31在Plosky Tolbachik以南16-20公里处开始,持续了超过2天。这种地震群非常类似于1975-76年托尔巴奇克火山喷发之前的地震活动,可以认为是可能的中止喷发。 (C)2015作者。由Elsevier B.V.发布。这是CC BY-NC-ND许可(http://creativecommons.org/licenses/by-nc-nd/4.0/)下的开放获取文章。

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