Analysis of International Monitoring System hydrophone triplet data: Identifying the August 2021 eruption at Fukutoku-Okanoba, 24.3°N Bonin Arc

Acoustical science and technology

article

Dirk Metz¹ 

[1] Research Institute for Marine Geodynamics, Japan Agency for Marine-Earth Science and Technology

关键词: Submarine eruption;    Fukutoku-Okanoba;    Wake Island;    CTBTO;    IMS;    SOFAR;   

DOI  :  10.1250/ast.43.125

学科分类：声学和超声波

来源: Acoustical Society of Japan

【 摘 要 】

Fukutoku-Okanoba is an active submarine volcano in the southern Bonin Arc, located 5 km northeast of Minami-Io¯to¯ in the Volcano Islands archipelago (Fig. 1A, B). Eruptive activity at the volcano, which shoals to depths of less than 30 m below sea level, has been reported on multiple occasions throughout recent years, including intermittent observations of discolored seawater, floating debris, and explosive degassing (e.g., [1,2]). Dziak and Fox [3] note detections of harmonic tremor from a nearby location between 1998 and 2001, which may have been associated with activity at Fukutoku-Okanoba. On 12 August 2021, the volcano entered a phase of cataclysmic activity that was first detected by the Himawari-8 geostationary satellite in the form of a rapidly expanding subaerial plume, triggering the issuance of an eruption notice by the Tokyo Volcano Ash Advisory Center [4]. Reports of Surtseyan-style activity have since included phreatomagmatic explosions, vigorous degassing, and the ejection of material from a central vent, around which an approximately 1-km wide, horse-shoe shaped island has formed.

【 授权许可】

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