加里波第火山:太平洋西北部长期休眠火山系统的潜在危害

IF 1.3 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY
Conner A. G. Morison, C. Hickson
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引用次数: 1

摘要

加里波第火山系统(MGVS)是加里波第火山带(GVB)最南端的成员,喀斯喀特火山弧的北部(加拿大)部分。时间上偶发性的爆发性到喷涌性喷发可能与冰期极大期后的峰值冰卸载有关。上覆冰盖的迅速和广泛的消冰作用以及冰川的回弹,改变了景观的物理特征,而该系统被认为已经处于1万多年的长期静止状态。在过去的60年里,由于旅游业和四季娱乐机会的增加,该地区人口稠密。MGVS对温哥华和惠斯勒度假城市之间的人口和基础设施构成了最大的火山威胁。我们认为,该系统是进一步科学研究的重点,因为如果对其喷发历史和危害有更好的了解,它已经“非常高”的整体威胁评分可能会增加。利用已发表的证据和现场证据,我们发现与该体系火山环境相关的潜在危害包括大量熔岩流、熔岩穹坍塌引发的火山碎屑密度流、火山灰沉降、碎屑流和火山泥流。由于使用现代地质年代学技术对该系统中相对较少的暴露进行了年代测定,我们借此机会(重新)校准了GVB相对较近喷发的已公布放射性碳年龄。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Mount Garibaldi: hazard potential from a long-dormant volcanic system in the Pacific Northwest
Mount Garibaldi Volcanic System (MGVS) is the southernmost member of Garibaldi Volcanic Belt (GVB), the northern (Canadian) segment of the Cascade Volcanic Arc. Temporally episodic explosive to effusive eruptions may be associated with peak ice unloading after glacial maxima. Rapid and widespread deglaciation of the overlying ice sheet, and glacial rebound, have altered the physical characteristics of the landscape whilst the system is thought to have been in long repose for over 10 000 years. Over the last 60 years, the region has become heavily populated due to increased tourism and all-season recreation opportunities. MGVS poses the greatest volcanic threat to the human population and built infrastructure between Vancouver and the resort municipality of Whistler. We believe that this system is a priority for further scientific research, given that its already “very high” overall threat score would likely increase if there was a better understanding of its eruptive history and hazards. Using published and field evidence, we show that potential hazards, related to the volcanic environment of this system, to the settlement of Squamish include voluminous lava flows, pyroclastic density currents triggered by lava dome collapse, tephra fallout, debris flows, and lahars. As relatively few exposures in the system have been dated using modern geochronological techniques, we take this opportunity to (re)calibrate published radiocarbon ages of relatively recent eruptions in GVB.
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来源期刊
Canadian Journal of Earth Sciences
Canadian Journal of Earth Sciences 地学-地球科学综合
CiteScore
2.80
自引率
7.10%
发文量
66
审稿时长
6-12 weeks
期刊介绍: The Canadian Journal of Earth Sciences reports current research in climate and environmental geoscience; geoarchaeology and forensic geoscience; geochronology and geochemistry; geophysics; GIS and geomatics; hydrology; mineralogy and petrology; mining and engineering geology; ore deposits and economic geology; paleontology, petroleum geology and basin analysis; physical geography and Quaternary geoscience; planetary geoscience; sedimentology and stratigraphy; soil sciences; and structural geology and tectonics. It also publishes special issues that focus on information and studies about a particular segment of earth sciences.
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