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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Spatial and temporal controls on pyroclastic flow hazard at Arenal volcano, Costa Rica
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Spatial and temporal controls on pyroclastic flow hazard at Arenal volcano, Costa Rica

机译：哥斯达黎加阿雷纳尔火山火山碎屑流危害的时空控制

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摘要

Pyroclastic flows represent the greatest volcanic hazard at Arenal volcano, Costa Rica, due to their recurrence, unpredictability, potential run outs, high velocities and short emplacement times. The main pyroclastic flow events occurring at Arenal during the present period of eruptive activity have been characterized and simulated using the geophysical flow model TITAN2D. The simulations performed, coupled with analyses of the evolution of Arenal concerning the topographic and morphological development of the volcanic edifice and the eruptive activity; provide insight into various temporal and spatial patterns of pyroclastic flow hazard. Increased pyroclastic flow frequency is shown to be related to the vertical growth rate of the active crater. The topographic evolution of the volcanic edifice and of the morphology of the lava field explain several observed spatial hazard patterns relating to flow directionality and run-out, and lava effusion rates are shown to be related to pyroclastic flow magnitude and volume. Identified patterns highlight the dynamism of pyroclastic flow hazard at Arenal, and its close relationship to the evolution of the volcanic edifice and of the eruptive activity. The simulations performed also draw attention to the sensitivity of pyroclastic flow emplacement to topographic features and to topographic change, highlighting the importance of up to date and accurate representations of the topography (DEMs) of the volcano for related hazard assessments.
机译：在哥斯达黎加的阿雷纳尔火山，火山碎屑流是最大的火山灾害，因为它们的复发，不可预测性，潜在的跳动，高速度和短安置时间。使用地球物理流模型TITAN2D，对阿雷纳尔火山喷发当前时期发生的主要火山碎屑流事件进行了表征和模拟。进行了模拟，并分析了阿雷纳尔（Arenal）的演变，涉及到火山大厦的地形和形态发展以及喷发活动；提供有关火山碎屑流危害的各种时间和空间模式的见解。火山碎屑流频率的增加与活性火山口的垂直增长率有关。火山大厦的地形演变和熔岩场的形态解释了几种与流向和径流有关的空间灾害模式，熔岩渗出率与火山碎屑流的大小和体积有关。识别出的模式突显了阿雷纳尔火山碎屑流危险的动力，及其与火山大厦和火山喷发活动的密切关系。进行的模拟还提请注意火山碎屑流进位对地形特征和地形变化的敏感性，突出显示了火山的地形（DEM）的最新和准确表示对于相关危险性评估的重要性。

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  • 来源
    《Journal of Volcanology and Geothermal Research》 |2012年第1期|p.45-64|共20页
  • 作者

    Delioma Oramas-Dorta; Paul D. Cole; Geoff Wadge; Guillermo E. Alvarado; Gerardo J. Soto;

  • 作者单位

    Department of Geography, Environment and Disaster Management, Coventry University, Priory Street, Coventry CV1 5FB, United Kingdom;

    Department of Geography, Environment and Disaster Management, Coventry University, Priory Street, Coventry CV1 5FB, United Kingdom Montserrat Volcano Observatory, Flemmings, Montserrat P.O. Box 318 Seismic Research Centre, University of the West Indies, St Augustine, Trinidad and Tobago;

    ESSC (Environmental Systems Science Centre), Harry Pitt Building, 3 Earley Gate, University of Reading Whiteknights Campus, Reading, RC6 6AL, United Kingdom;

    Area de Amenazas y Auscultation Slsmica y Volcanica, Instituto Costarricense de Electricidad, Apdo. 10032-1000, San Jose, Costa Rica;

    Area de Amenazas y Auscultation Slsmica y Volcanica, Instituto Costarricense de Electricidad, Apdo. 10032-1000, San Jose, Costa Rica;

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

    arenal volcano; pyroclastic flows; hazard; TITAN2D; topography;

    机译：阿雷纳尔火山;火山碎屑流冒险;TITAN2D;地形;

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