Magnitude 5.3 #earthquake on the mid-Atlantic ridge 20 minutes ago (2022-12-01Z11:02) These signals are not on seismometers but on hydrophones nearly a kilometer below the sea surface.
The stations are part of the United Kingdom contribution to the CTBT monitoring system. I have written about this network and how to obtain #hydroacoustic data: https://www.tandfonline.com/doi/full/10.1080/25751654.2022.2129948 (#OpenAccess)

https://earthquake.usgs.gov/earthquakes/eventpage/us6000j608/executive

A few weeks ago I published an #OpenAccess paper in the Journal for Peace and Nuclear Disarmament. I examine the #hydroacoustic network of the #CTBTO and find which data is currently open via #IRIS
and show processing examples. I want to encourage exploitation of this data. https://doi.org/10.1080/25751654.2022.2129948 (thread)