On the seafloor just off of the U.S. East Coast lies a barely known world, explorations of which bring continual surprises. As recently as the mid-2000s, practically zero methane seeps - spots on the seafloor where gas leaks from the Earth's crust - were thought to exist off the East Coast; while one had been reported more than a decade ago, it was thought to be one of a kind. But in the past two years, additional studies have revealed a host of new areas of seafloor rich in seeps, said Laura Brothers, a research geologist at the U.S. Geological Survey. New technologies have allowed scientists to keep locating new seeps, including one that may be the largest in the world. The findings have changed geologists' understanding of the processes taking place beneath the seafloor. "These newly discovered [seafloor] communities show that there is much more seafloor methane venting then we previously thought, and suggests that there are many more seeps out there that we don't know about," Brothers said.
An even larger, previously unknown vent was found off the coast of Virginia, in research by Steve Ross, a scientist at the University of North Carolina at Wilmington, and Sandra Brooke, a scientist at Florida State University. Discovered near the Norfolk submarine canyon, the vent is the largest in the Atlantic, and possibly in all of the world's oceans, Ross told
LiveScience. North America's continental shelf, the underwater edge of the continent that borders the Atlantic Ocean basin, is littered with underwater canyons etched by rivers thousands of years ago when the region was above sea level.