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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Eruptive sequence and seismic activity of Llaima volcano (Chile) during the 2007-2009 eruptive period: Inferences of the magmatic feeding system
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Eruptive sequence and seismic activity of Llaima volcano (Chile) during the 2007-2009 eruptive period: Inferences of the magmatic feeding system

机译：2007-2009年火山爆发期间莱马火山（智利）的火山喷发序列和地震活动：岩浆饲喂系统的推论

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摘要

Llaima Volcano, one of the most active volcanoes in South America, has experienced intense activity during the last 100 years. The most recent eruptive activity occurred during the period 2007-2009 with at least six energetic eruptions, the January 1st 2008 (VEl3) being the strongest episode. Most of the paroxysmal activity was characterized by a rapid increase in seismic energy (minutes to hours) and the absence of precursory signals, as well as by an accelerated drop of the seismic energy and eruption intensity at the end. Moreover, subtle changes in the increase of low-energy long-period (LP) seismicity and the occurrence of minor explosive activity (six months before the onset of the eruptive cycle), were the only remarkable changes observed in advance.This is the first study that includes a detailed description of the 2007-2009 eruptive period and is based on a temporal analysis of the seismic records, technical reports from the monitoring network and 2000 photos. This set allows a characterization of the coeval eruptive styles (including strombolian and hawaiian activity), morphological changes of the active vents inside the main crater and two fractures located in the SW and SE flanks. Ten phases were identified based on the eruptive style, Volcanic Explosivity Index (VEI) and the salient features of the seismic events. The seismicity that accompanied the eruptive phases was characterized by the predominance of a continuous tremor (TR) and discrete LP events, and a remarkable absence of volcano-tectonics (VT) earthquakes. A waveform cross-correlation analysis of LP events showed an overall low similarity between them, which suggests multiple sources.Our observations and analysis suggest that the plumbing system is composed of multiple independent structures, some of which reached the surface during this eruptive period, indicating that the upper part of the cone could be an unstable and essentially weak zone. The activity and seismicity observed are characteristic of an open-vent system in which the magma can ascend rapidly from several km depth, with little to no clear precursory activity. These results are in agreement with petrological studies of the products of these eruptions. (C) 2019 Elsevier B.V. All rights reserved.
机译：莱马火山（Llaima Volcano）是南美最活跃的火山之一，在过去的100年中经历了激烈的活动。最近的喷发活动发生在2007年至2009年期间，至少发生了6次高能喷发，其中2008年1月1日（VE13）最强。大部分阵发性活动的特征是地震能量迅速增加（数分钟至数小时），并且没有前兆信号，并且最终地震能量和喷发强度急剧下降。此外，低能量长周期（LP）地震活动性的增加和微小爆炸活动的发生（爆发周期开始前六个月）的细微变化是事先观察到的唯一显着变化。这项研究包括对2007-2009年爆发期的详细描述，并基于对地震记录的时间分析，监测网络的技术报告和2000张以上的照片。这组特征可以表征出中世纪的喷发样式（包括斯特伦贝里和夏威夷活动），主火山口内部活动喷口的形态变化以及西南和东南侧的两个裂缝。根据喷发类型，火山爆炸指数（VEI）和地震事件的显着特征，确定了十个阶段。爆发期伴随的地震活动的特征是连续震颤（TR）和离散的LP事件占主导地位，并且火山构造（VT）地震明显不存在。 LP事件的波形互相关分析表明它们之间的总体相似性较低，这表明存在多个来源。圆锥的上部可能是一个不稳定且本质上薄弱的区域。观测到的活动性和地震活动性是一个开放系统的特征，在该系统中，岩浆可以从几公里的深度迅速上升，几乎没有甚至没有明显的前兆活动。这些结果与这些喷发产物的岩石学研究一致。 （C）2019 Elsevier B.V.保留所有权利。

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  • 来源
    《Journal of Volcanology and Geothermal Research》 |2019年第15期|90-105|共16页
  • 作者

    Franco Luis; Luis Palma Jose; Lara Luis E.; Gil-Cruz Fernando; Cardona Carlos; Basualto Daniel; San Martin Juan;

  • 作者单位

    Serv Natl Geol & Mineria, Observ Volcanol Andes Sur, Rudecindo Ortega 03850, Temuco, Chile|Univ Concepcion, Programa Doctorado Ciencias Geol, Victor Lamas 1290, Concepcion, Chile;

    Univ Concepcion, Programa Doctorado Ciencias Geol, Victor Lamas 1290, Concepcion, Chile|Univ Concepcion, Fac Ciencias Quim, Dept Ciencias Tierra, Victor Lamas 1290, Concepcion, Chile;

    Serv Nacl Geol & Mineria, Av Santa Maria 0104, Santiago, Chile|Res Ctr Integrated Risk Management CIGIDEN, Av Vicuna Mackenna 4860, Santiago, Chile;

    Serv Natl Geol & Mineria, Observ Volcanol Andes Sur, Rudecindo Ortega 03850, Temuco, Chile;

    Serv Natl Geol & Mineria, Observ Volcanol Andes Sur, Rudecindo Ortega 03850, Temuco, Chile;

    Univ Catolica Temuco, Fac Ingn, Dept Geol & Obras Civiles, Temuco, Chile;

    Univ La Frontera, Fac Ingn, Dept Ciencias Fis, Casilla 54-D, Temuco, Chile;

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  • 正文语种 eng
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  • 关键词

    Fractures; Hawaiian and strombolian styles; Volcano seismicity; Open conduit system; Llaima volcano;

    机译：断裂;夏威夷和斯特朗伯风格;火山地震;开放导管系统;莱马火山;

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