The reverse scenario would be much more likely, that seismic activity would trigger a methane release from sea beds (for example). (geoengineeringwatch.org)
Besides the ocean, there are the ancient sea beds with exposed deposits around the world. (paleodietnews.com)
With waves coming from a left and right direction and a completely sandy sea bed, it provides perfect fun rides for the less experienced. (surfvoucher.com)