Probably the best recording I’ve ever heard of an 850/1020hz Waves. They are heard at around 1:30 in the video. As many of you are aware, a large earthquake in Taiwan triggered Tsunami warnings across the Asia Pacific rim. Obviously the video is not mine, but it’s definitely worth sharing with the siren community!
https://youtu.be/ZZzn74ZjTXs?si=1XVoWm7vpJIKZi3M