National Oceanic and
Atmospheric Administration
United States Department of Commerce

What's New

June 28, 2018
A hydrophone is placed on the ocean floor to record the sound of bubbles.

A hydrophone is placed on the ocean floor to record the sound of bubbles. Photo credit: Ocean Exploration Trust

June 28, 2018

PMEL's Acoustic and Earth-Ocean Interactions programs have successfully recorded the sound of methane bubbles from the seafloor off the Oregon coast using a hydrophone, opening the door to using acoustics to identify - and perhaps quantify - this important greenhouse gas in the ocean. Methane is found both as an icy hydrate deposit and in a gas phase within the sediments of the continental margins. The methane stored in the Cascadia margin, located offshore Washington,...

In the News

Ocean researchers have found nearly 1,000 methane seep sites along the... more

Tiny bubbles of methane gas can be detected rising from the seafloor using sensitive underwater microphones and the sound data can be... more