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Glacial earthquake-generating iceberg calving in a narwhal summering ground : The loudest underwater sound in the Arctic?

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Title: Glacial earthquake-generating iceberg calving in a narwhal summering ground : The loudest underwater sound in the Arctic?
Authors: Podolskiy, Evgeny A. Browse this author
Murai, Yoshio Browse this author →KAKEN DB
Kanna, Naoya Browse this author →KAKEN DB
Sugiyama, Shin Browse this author →KAKEN DB
Issue Date: 1-Jan-2022
Publisher: Acoustical Society of America
Journal Title: Journal of the acoustical society of America
Volume: 151
Issue: 1
Start Page: 6
End Page: 16
Publisher DOI: 10.1121/10.0009166
Abstract: Measurements of underwater sound are still scarce in the rapidly changing Arctic. Tele-seismically detectable glacial earthquakes caused by iceberg calving have been known for nearly two decades but their underwater sound levels remain undocumented. Here, we present near-source underwater sound records from a kilometer-scale iceberg calving associated with a glacial earthquake. Records were obtained using an ocean-bottom lander deployed near the calving front of a Greenlandic tidewater Bowdoin Glacier in July 2019. An underwater-detonation-like signal with an overall duration of 30 min and two major phases owing to iceberg detachment and disintegration corresponded to extreme source sound levels (225 +/- 10 dB(p2p)( )re 1 mu Pa) and acoustic energy on the order of 10(8-)(10) J or 0.1-7.6 tonnes TNT-equivalent. Our estimates and comparison with other anthropogenic and natural sources suggest that this type of geophysical event is among the loudest sounds in the Arctic. Such high sound levels are important for estimating the noise budget of the ocean and possible impacts on endemic Arctic species exposed to such sounds. The sound of calving may cause direct mechanical damage to the hearing of marine mammals such as narwhals and seals present in the glacial fjord. (C) 2022 Author(s).
Type: article
Appears in Collections:北極域研究センター (Arctic Research Center) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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