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 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 [Formula: see text] 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 noi

SUBMITTER: Lamb OD 

PROVIDER: S-EPMC8478913 | biostudies-literature | 2021 Sep

REPOSITORIES: biostudies-literature