1854 Toukai, Nankai 1896 Meiji Sanriku1933 Showa Sanriku1944 Tounankai1946 Nankai1960 Chile1983 Japan Sea 1993 Okushiri2011 Tohoku
Tsunami around Japan
Eurasian plate
Philippine plate
Pacific plate
North American plate
1611 Keichou Sanriku
SanrikuTohoku Ria coastV-shape bay
103km
fault motion
L
h at most4000m
100/1/ Lh
long waves
Tsunami generated at subduction zone
plate
Large water pressure in deep water
JapanUSA
Meiji Sanriku1896/06/1520:00 pmM8.2~8.5(tsunami Eq.)
Showa Sanriku1933/03/03M8.12:30am
Keicho Sanriku1611
Chilean Tsunami1960/05/24
地震調査委員会の図に加筆
Historical Earthquakes
Aftershockscompiled by JMA
5.3m Eastward1.2m subsidence
Ground displacement
阿部・菅野・千釜(1990)Minoura・Nakaya(1991)
Satake, Namegaya,Yamaki(2008)
Jougan Tsunami(869)
・old document・tsunami sedimentsonce in 1000yrs
All data plotted with the past eventsThe 2011 Tohoku Earthquake Tsunami Joint Survey Grouphttp://www.coastal.jp/ttjt/
data as of Apr 30, 2011
The 2011 Tohoku Earthquake Tsunami Joint Survey Grouphttp://www.coastal.jp/ttjt/
data as of Apr 30, 2011
Kuji
Kuji by Japan Self‐Defence Force
Taro
田老
15
居住者 死者 行方不
明者
割合
A地区(二重堤に守ら
れている地域)
1610 63 9 4.5%
B地区 566 19 36 9.7%
C地区 278 12 5 6.1%
Taken by Japan Self‐Defence Force
Mainichi News Paper(15/May)
OotsuchiRiver
Kozuchi River
JR Railway
Iwate Prefecture
Seawall
岩手県提供
T.P.+13m
Death 726, Missing 978, as of May 1, 2011
Collapsed Seawalls
Kamaishi
Rikuzentakada1km far from coast line
Rikuzentakada
Kesennuma
Onagawa
No.2
No.3
Natural Breakwaters Matsushima
10.3m
4.5m
Failure of Katsura Island at the Ocean Side
10.3m
Huge Tsunami in Sanriku CoastLarger than Meiji & Showa events
Attack in wide subsided areas in short timeOnce in 100 to 1000 years
Damages on flat plain formed around rivermouthTsu-nami affected not only ‘tsu’, ports and harbors, but also flat plains
2011 Tohoku Tsunami