"Earthquakes in Japan"(PDF) (in Japanese). Cabinet Office, Government of Japan. pp. 5–6. Archived from the original(PDF) on March 27, 2009. Retrieved 2009-05-06.
"Earthquakes in Japan"(PDF) (in Japanese). Cabinet Office, Government of Japan. pp. 5–6. Archived from the original(PDF) on March 27, 2009. Retrieved 2009-05-06.