- http://www.hdl.ss.muse.kansai-u.ac.jp/2010-ttjt - http://earthquake.usgs.gov/earthquakes/recenteqsww/Quakes/usc0001xgp.php - http://earthquake.usgs.gov/earthquakes/eqarchives/poster/2011/20110311.php -- USGS - http://www.mlit.go.jp/saigai/saigai_110311.html -- Ministry of Land, Infrastructure, Transport and Tourism - http://www.kk-grp.jp/english/csr/201103_tohoku/index.html -- Kokusai Kogyo Group