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http://peacephilosophy.blogspot.jp/p/blog-page_31.html
http://www.iam-t.jp/HIRAI/pageall.html
http://historical.seismology.jp/ishibashi/opinion/2011touhoku.html
http://www.j-cast.com/2011/04/16093099.html?p=all
http://web.archive.org/web/20010702051538/www.gns.ne.jp/eng/g-ken/igiari/obj_02.htm
http://cdn.nikkei.co.jp/parts/ds/pdf/001/20110417_02.pdf
http://www.nationalgeographic.co.jp/news/news_article.php?file_id=20110315001

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