Audible acoustics from low-magnitude fluid-induced earthquakes in Finland

Abstract Earthquakes are frequently accompanied by public reports of audible low-frequency noises. In 2018, public reports of booms or thunder-like noises were linked to induced earthquakes during an Engineered Geothermal System project in the Helsinki Metropolitan area. In response, two microphone...

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Autores principales:	Oliver D. Lamb, Jonathan M. Lees, Peter E. Malin, Tero Saarno
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/6e914e13fd274b13b16da6cf921ca1c2
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id	oai:doaj.org-article:6e914e13fd274b13b16da6cf921ca1c2
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spelling	oai:doaj.org-article:6e914e13fd274b13b16da6cf921ca1c22021-12-02T19:17:00ZAudible acoustics from low-magnitude fluid-induced earthquakes in Finland10.1038/s41598-021-98701-62045-2322https://doaj.org/article/6e914e13fd274b13b16da6cf921ca1c22021-09-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-98701-6https://doaj.org/toc/2045-2322Abstract Earthquakes are frequently accompanied by public reports of audible low-frequency noises. In 2018, public reports of booms or thunder-like noises were linked to induced earthquakes during an Engineered Geothermal System project in the Helsinki Metropolitan area. In response, two microphone arrays were deployed to record and study these acoustic signals while stimulation at the drill site continued. During the 11 day deployment, we find 39 earthquakes accompanied by possible atmospheric acoustic signals. Moment magnitudes of these events ranged from $$-0.07$$ - 0.07 to 1.87 with located depths of 4.8–6.5 km. Analysis of the largest event revealed a broadband frequency content, including in the audible range, and high apparent velocities across the arrays. We conclude that the audible noises were generated by local ground reverberation during the arrival of seismic body waves. The inclusion of acoustic monitoring at future geothermal development projects will be beneficial for studying seismic-to-acoustic coupling during sequences of induced earthquakes.Oliver D. LambJonathan M. LeesPeter E. MalinTero SaarnoNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-8 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Oliver D. Lamb Jonathan M. Lees Peter E. Malin Tero Saarno Audible acoustics from low-magnitude fluid-induced earthquakes in Finland
description	Abstract Earthquakes are frequently accompanied by public reports of audible low-frequency noises. In 2018, public reports of booms or thunder-like noises were linked to induced earthquakes during an Engineered Geothermal System project in the Helsinki Metropolitan area. In response, two microphone arrays were deployed to record and study these acoustic signals while stimulation at the drill site continued. During the 11 day deployment, we find 39 earthquakes accompanied by possible atmospheric acoustic signals. Moment magnitudes of these events ranged from $$-0.07$$ - 0.07 to 1.87 with located depths of 4.8–6.5 km. Analysis of the largest event revealed a broadband frequency content, including in the audible range, and high apparent velocities across the arrays. We conclude that the audible noises were generated by local ground reverberation during the arrival of seismic body waves. The inclusion of acoustic monitoring at future geothermal development projects will be beneficial for studying seismic-to-acoustic coupling during sequences of induced earthquakes.
format	article
author	Oliver D. Lamb Jonathan M. Lees Peter E. Malin Tero Saarno
author_facet	Oliver D. Lamb Jonathan M. Lees Peter E. Malin Tero Saarno
author_sort	Oliver D. Lamb
title	Audible acoustics from low-magnitude fluid-induced earthquakes in Finland
title_short	Audible acoustics from low-magnitude fluid-induced earthquakes in Finland
title_full	Audible acoustics from low-magnitude fluid-induced earthquakes in Finland
title_fullStr	Audible acoustics from low-magnitude fluid-induced earthquakes in Finland
title_full_unstemmed	Audible acoustics from low-magnitude fluid-induced earthquakes in Finland
title_sort	audible acoustics from low-magnitude fluid-induced earthquakes in finland
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/6e914e13fd274b13b16da6cf921ca1c2
work_keys_str_mv	AT oliverdlamb audibleacousticsfromlowmagnitudefluidinducedearthquakesinfinland AT jonathanmlees audibleacousticsfromlowmagnitudefluidinducedearthquakesinfinland AT peteremalin audibleacousticsfromlowmagnitudefluidinducedearthquakesinfinland AT terosaarno audibleacousticsfromlowmagnitudefluidinducedearthquakesinfinland
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Audible acoustics from low-magnitude fluid-induced earthquakes in Finland

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