http://www.hinet.bosai.go.jp/about_earthquake/part1.htm Japanese web site; official data of Shindo 1–7 in 1997 to 2006 is 32,244 times, and Shindo 1–3 is 4 to 5 times in a day. Web site of 防災科学技術研究所;National Research Institute for Earth Science and Disaster Prevention=NIED/ Although none of web site is available for basis of 400 times in a day, but 400 times is well told and well assumable number with this data.
http://www.hinet.bosai.go.jp/about_earthquake/part1.htm Japanese web site; official data of Shindo 1–7 in 1997 to 2006 is 32,244 times, and Shindo 1–3 is 4 to 5 times in a day. Web site of 防災科学技術研究所;National Research Institute for Earth Science and Disaster Prevention=NIED/ Although none of web site is available for basis of 400 times in a day, but 400 times is well told and well assumable number with this data.
