Huge Japan quake cracked open seafloor - Technology & science - Science - OurAmazingPlanet - msnbc.com: SAN FRANCISCO — The March 2011 megaquake off the coast of Japan opened up fissures as wide as 6 feet (3 meters) in the seafloor, a new study finds.
The fissures now scar the seafloor where peaceful clam beds once lay, according to Takeshi Tsuji, a researcher at Kyoto University in Japan. Along with seismic studies, the fissures, revealed by manned submersible vehicles that investigated the seafloor after the quake, show how the crust around the quake's epicenter expanded and cracked