Hydroacoustic measurements of the 2014 eruption at Ahyi volcano, 20.4°N Mariana Arc

TitleHydroacoustic measurements of the 2014 eruption at Ahyi volcano, 20.4°N Mariana Arc
Publication TypeJournal Article
Year of PublicationSubmitted
AuthorsMetz, D., and Grevemeyer I.
JournalGeophysical Research Letters
EndNote Rec Number12159
Abstract

Abstract Ahyi is a fully submerged arc volcano in the Northern Mariana Islands, northwestern Pacific Ocean. In April and May 2014, the volcano erupted over a period of 15 days. Results from direction-of-arrival calculations show that underwater sound phases associated with the episode were recorded as far as Wake Island, where a hydrophone triplet array is operated as part of the International Monitoring System. After a 3.5 hours long sequence of hydroacoustic precursory events, explosive volcanic activity occurred in two distinct, several-days-long bursts, accompanied by a notable decrease in low-frequency arrivals that may indicate a shift in signal source parameters. Acoustic resolution of the hydrophone data supersedes broadband networks by almost one order of magnitude, successfully identifying seismic events at Ahyi as low as 2.5 mb. Total radiated acoustic energy of the eruption is estimated at 9.7 1013 J, which suggests that submarine volcanic activity contributed significantly to the ocean soundscape.