Tsunami Event - March 11, 2011 Honshu

13:50 JST 12 Mar 2011 Sanriku Oki M8.8 Tsunami Warning(Major Tsunami)
03:20 JST 12 Mar 2011 Sanriku Oki M8.8 Tsunami Warning(Major Tsunami)
22:53 JST 11 Mar 2011 Sanriku Oki M8.8 Tsunami Warning(Major Tsunami)
21:35 JST 11 Mar 2011 Sanriku Oki M8.8 Tsunami Warning(Major Tsunami)
18:47 JST 11 Mar 2011 Sanriku Oki M8.8 Tsunami Warning(Major Tsunami)
16:08 JST 11 Mar 2011 Sanriku Oki M8.4 Tsunami Warning(Major Tsunami)
15:30 JST 11 Mar 2011 Sanriku Oki M7.9 Tsunami Warning(Major Tsunami)
15:14 JST 11 Mar 2011 Sanriku Oki M7.9 Tsunami Warning(Major Tsunami)
14:49 JST 11 Mar 2011 Sanriku Oki M7.9 Tsunami Warning(Major Tsunami)

http://www.jma.go.jp/en/tsunami/list.html
http://nctr.pmel.noaa.gov/honshu20110311/
times in minutes between major warnings: 25, 16, 38, 159, 168, 78, 267, 630