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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Pyroclastic flow hazard at Arenal volcano, Costa Rica: scenarios and assessment
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Pyroclastic flow hazard at Arenal volcano, Costa Rica: scenarios and assessment

机译：哥斯达黎加阿雷纳尔火山的火山碎屑流危害：情景和评估

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摘要

The present work provides a comprehensive understanding of the evolution of pyroclastic flow hazard at Arenal volcano, Costa Rica, during the recent period of volcanic activity. It uses the geophysical flow model TITAN2D to analyze and summarize pyroclastic flow hazard patterns associated with the topographic development of the volcanic edifice ("radial hazard pattern") and to an observed evolution in the nature of pyroclastic flows at Arenal ("concentric hazard pattern"). In this regard, a new classification of pyroclastic flows of gravitational origin at Arenal is proposed and characterized, presenting different levels of associated hazard-ousness. TITAN2D has been used as a basis to produce pyroclastic flow hazard maps for two defined scenarios: a "current" hazard scenario, considered as being fairly representative of the present-day situation at Arenal; and another scenario which is thought could represent a stage in future pyroclastic flow hazard where crater C has largely engulfed crater D as a result of topographic change. These two maps show significantly different hazard distributions, and demonstrate the need for frequent updates of hazard assessments in this and other similarly dynamic volcanic settings. In the case of Arenal, this implies a need for regularly updating the topographic models of the volcano to capture topographic changes that impact the distribution of volcanic flow hazard. Furthermore, this work provides a detailed evaluation of TITAN2D regarding its suitability to form the basis of such hazard assessments.
机译：本工作提供了对最近火山活动期间哥斯达黎加阿雷纳尔火山火山碎屑流危害演变的全面了解。它使用地球物理流模型TITAN2D来分析和总结与火山大厦的地形发展相关的火山碎屑流危害模式（“径向危害模式”）以及在阿雷纳尔火山碎屑流的性质观察到的演变（“同心危害模式”） ）。在这方面，提出并表征了阿雷纳尔引力源火山碎屑流的新分类，并对其进行了表征，提出了相关危险程度的不同水平。 TITAN2D已被用作生成两种定义方案的火山碎屑流危害图的基础：“当前”危害方案，被认为可以充分代表阿雷纳尔的当前状况；另一个可能被认为可能代表未来火山碎屑流危险的场景是，由于地形变化，火山口C在很大程度上吞噬了火山口D。这两幅图显示了明显不同的危害分布，并表明需要在这种和其他类似动态火山环境中频繁更新危害评估。就阿雷纳尔而言，这意味着需要定期更新火山的地形模型，以捕获影响火山流动危险性分布的地形变化。此外，这项工作提供了有关TITAN2D是否适合构成此类危害评估基础的详细评估。

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    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, West Indies, British Overseas Territory,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 RG6 6AL, United Kingdom;

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

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

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  • 正文语种 eng
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  • 关键词

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

    机译：阿雷纳尔火山;火山碎屑流危害图;TITAN2D;地形;

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