[Rockhounds] Earthquake 'hack' reveals scale of ocean warming

[Kreigh Tomaszewski]

Scientists have found a clever new way of measuring ocean warming, using
sound waves from undersea earthquakes.

The researchers say the "hack" works because sound travels faster in warmer
water.

The team looked at sonic data from the Indian Ocean emitted by tremors over
a 10-year period.

As the seas have warmed due to global heating, the scientists have seen the
sound waves increase in speed.

Their new method shows the decadal warming trend in the Indian Ocean was
far higher than previous estimates.

https://www.bbc.com/news/science-environment-54193334