1. Coastal Development Institute of Technology (2011): CDIT, 35, 2011, 1.
2. Google (2011): Google Earth, 〈http://www.google.co.jp/intl/ja/earth/index.html〉.
3. Geospatial Information Authority of Japan (2011): Archive of Japanese Land Translation, 〈http://archive.gsi.go.jp/airphoto/〉 (in Japanese).
4. Geospatial Information Authority of Japan, land condition map (2011): 〈http://www1.gsi.go.jp/geowww/themap/lcm/sendai.html〉 (in Japanese).
5. Japan Meteorological Agency (2011a): The 2011 off the Pacific Coast of Tohoku Earthquake, 〈http://www.jma.go.jp/jma/menu/jishin-portal.html#b〉 (in Japanese).