Comprehensive studies for the 2011 off the Pacific coast of Tohoku earthquake

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The ocean bottom seismometers deployed above the source region of　the 2011 off the Pacific coast of Tohoku earthquake were recovered and precise aftershock distribution was obtained. The seafloor observations were continued to clear variation of the aftershock activity. The crustal movement after the mainshock was estimated by using seafloor geodetic observations. Seismic reflection surveys revealed seismic structures above the source region. Field surveys for tsunami were carried and slip distribution on the source fault was obtained. Damage of constructions was clarified by filed surveys and widespread survey was also carried out from a view of disaster prevention of urban areas.