Significance and Background of Mapping the Area Hit by the Tsunami on March 11, 2011, Northeast Japan

概要

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The March 11, 2011, earthquake off the Pacific coast of northeastern Japan caused large tsunami. Tsunami-damaged areas were mapped on a scale of 1 : 25,000 based on the interpretation of stereopaired aerial photographs taken immediately after the earthquake by the Geospatial Information Authority of Japan. The area interpreted in this study was from Aomori to Chiba prefecture, except for the restricted area around the Fukushima nuclear power plant. Areas for which no aerial photographs were available were mapped using Google Earth and other sources. The purpose of mapping was to provide prompt basic information on the extent of tsunami invasion and distribution of devastated areas for all people taking countermeasures against the disaster. The lessons from our mapping area are that 1) aerial photographs should be taken as soon as possible after disasters and 2) a working team should be quickly arranged to map damaged areas and release the results.