Warwick Rachel, Williams-Jones Glyn, Kelman Melanie, Witter Jeffrey
Centre for Natural Hazards Research, Department of Earth Sciences, Simon Fraser University, 8888 University Dr., Burnaby, BC V5A 1S6 Canada.
Geological Survey of Canada, 1500-605 Robson St., Vancouver, BC V6B 5J3 Canada.
J Appl Volcanol. 2022;11(1):5. doi: 10.1186/s13617-022-00114-1. Epub 2022 Apr 29.
The Mount Meager Volcanic Complex (Mount Meager) is a glacier-clad stratovolcanic system in southwestern British Columbia which last erupted over 2400 years ago (VEI 4). While this is Canada's most recent major explosive eruption, most past research on Mount Meager has focused on its numerous and large volume landslides and thus the volcanic hazard characteristics remain understudied. Here we present a suite of scenario-based hazard maps and an assessment addressing a range of potential future explosive eruptions and associated hazards. In order to overcome limited knowledge of the eruptive history, numerical models have been used to simulate the primary syneruptive hazards of concern (dome-collapse pyroclastic density currents, lahars and tephra fallout) largely utilizing eruption parameters from analogous volcanoes, i.e., glacier-clad stratovolcanoes in a subduction zone setting. This study provides a framework for similar volcanic hazard studies where geologic data is limited, funds are minimal, and access is difficult. Furthermore, this sets the stage for recognizing volcanic hazards in the Canadian landscape, providing a resource to prepare for and mitigate potential impacts well in advance of a crisis situation.
米ager山火山复合体（米ager山）是不列颠哥伦比亚省西南部一个被冰川覆盖的层状火山系统，其最后一次喷发发生在2400多年前（火山爆发指数4级）。虽然这是加拿大最近一次的重大爆炸性喷发，但过去对米ager山的大多数研究都集中在其众多且体积巨大的山体滑坡上，因此火山灾害特征仍未得到充分研究。在此，我们展示了一套基于情景的灾害地图以及一项针对一系列潜在未来爆炸性喷发和相关灾害的评估。为了克服对喷发历史了解有限的问题，数值模型已被用于模拟主要的同期喷发灾害（穹顶崩塌火山碎屑密度流、火山泥流和火山灰沉降），主要利用来自类似火山的喷发参数，即在俯冲带环境中被冰川覆盖的层状火山。本研究为地质数据有限、资金极少且难以进入的类似火山灾害研究提供了一个框架。此外，这为识别加拿大地貌中的火山灾害奠定了基础，提供了一种资源，以便在危机情况发生之前就提前做好准备并减轻潜在影响。
