Ultra-long-range hydroacoustic observations of submarine volcanic activity at Monowai, Kermadec Arc

International audience Monowai is an active submarine volcanic center in the Kermadec Arc, Southwest Pacific Ocean. During May 2011, it erupted over a period of 5 days, with explosive activity directly linked to the generation of seismoacoustic T phases. We show, using cross-correlation and time-dif...

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Bibliographic Details
Published in:Geophysical Research Letters
Main Authors: Metz, D., Watts, Anthony B., Grevemeyer, I., Rodgers, M., Paulatto, M.
Other Authors: Department of Earth Sciences Oxford, University of Oxford, Helmholtz Centre for Ocean Research Kiel (GEOMAR), Géoazur (GEOAZUR 7329), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur, Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD France-Sud )
Format: Article in Journal/Newspaper
Language:English
Published: HAL CCSD 2016
Subjects:
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences
Pacific
South Atlantic Ocean
Online Access:https://hal.science/hal-01347208
https://hal.science/hal-01347208/document
https://hal.science/hal-01347208/file/2015GL067259.pdf
https://doi.org/10.1002/2015GL067259
Description
Summary:International audience Monowai is an active submarine volcanic center in the Kermadec Arc, Southwest Pacific Ocean. During May 2011, it erupted over a period of 5 days, with explosive activity directly linked to the generation of seismoacoustic T phases. We show, using cross-correlation and time-difference-of-arrival techniques, that the eruption is detected as far as Ascension Island, equatorial South Atlantic Ocean, where a bottom moored hydrophone array is operated as part of the International Monitoring System of the Comprehensive Nuclear-Test-Ban Treaty Organization. Hydroacoustic phases from the volcanic center must therefore have propagated through the Sound Fixing and Ranging channel in the South Pacific and South Atlantic Oceans, a source-receiver distance of ~15,800 km. We believe this to be the furthest documented range of a naturally occurring underwater signal above 1 Hz. Our findings, which are consistent with observations at regional broadband stations and long-range, acoustic parabolic equation modeling, have implications for submarine volcano monitoring

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