I'm quoting Quanta rather than linking to Guardian coverage or the original paper because Quanta has the best writers for non-technical folks who want to know about this.

QMquantamagazine.bsky.socialSep 12, 2024 6:03pm

It took military data, a complex tsunami simulation, 68 scientists, and one unfortunate bathtub experiment to find out what caused a bizarre global seismic event. www.quantamagazine.org/how-did-a-la...

How Did a Landslide Shake the Earth for Nine Days? | Quanta Magazine

Last year, an immense but brief outburst of seismic energy was soon followed by a long hum that made the world ring. Finding its cause took 68 scientists and an assist by the Danish military.

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That was fascinating. Thank you.

It's great work

What a great article.