• 主题
高级搜索  >
历史搜索 清空历史
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
【24h】

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年喷发期间Laila火山（智利）的喷发序列和地震活动：岩浆喂养系统推论

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

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：Laiala火山是南美最活跃的火山之一，在过去100年中经历了激烈的活动。最近的爆发活动发生在2007 - 2009年期间，至少有六个充满活力的爆发，2008年1月1日（Vel3）是最强的集。大多数阵发性活动的特征在于地震能量（分钟到小时）的快速增加，并且在末端的地震能量和喷发强度的加速下降的情况下存在的缺失。此外，低能量长期（LP）地震性和发生次要爆炸活动的发生的微妙变化（爆发周期发作前六个月），是预先观察到的唯一显着变化。这是第一个研究包括2007-2009爆发期的详细描述，并基于对地震记录的时间分析，监控网络和2000张照片的技术报告。该组允许表征群爆发风格（包括Strombolian和Hawaiian活动），主要火山口内的主动通风口的形态变化和位于SW和SE侧面的两个裂缝。基于喷发风格，火山爆炸性指数（VEI）和地震事件的突出特征来确定十个阶段。伴随爆发阶段的地震性的特征在于，连续震颤（TR）和离散LP事件的主要职位，以及显着的火山构造（VT）地震的缺失。 LP事件的波形互相关分析显示它们之间的总体低相似性，这表明了多种源。我们的观察和分析表明，管道系统由多个独立结构组成，其中一些爆发期间将在该爆发期间到达表面，表明锥体的上部可能是一个不稳定且基本上弱的区域。观察到的活动和地震性是开放式系统的特征，其中岩浆可以从几km深度升高，几乎没有明确的前兆活。这些结果与这些爆发的产品的岩浆研究一致。 （c）2019 Elsevier B.v.保留所有权利。

著录项

  • 来源
    《Journal of Volcanology and Geothermal Research》 |2019年第jul15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;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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

    机译：骨折;夏威夷和Strombolian款式;火山地震性;开放式管道系统;莱卡火山;

相似文献

  • 外文文献
  • 中文文献
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号