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Home > Weather and Earthquakes > Tsunami Warnings/Advisories, Tsunami Information

Tsunami Information (Tsunami Observation)

Tsunami Information
This Tsunami Information was issued in the past
Occurred at 14:46 JST 11 Mar 2011
Region name Sanriku Oki
Depth about 20 km
Magnitude 8.8
Initial Tsunami Observation
Click the map to zoom in

Maximum Tsunami Observation

Tsunami Information NUMBER 27
(Tsunami Observations)

Issued at 18:13 JST 11 Mar 2011

Tsunami Observations
As of 18:13 JST
In some coastal regions, it is inferred that tsunamis higher than those recorded at observation sites have arrived.
Tsunamis may be higher than those recorded at observation sites.

KushiroInitial Tsunami  15:34 JST 11 Mar    (+)    2.0 m  
Maximum Tsunami  15:51 JST 11 Mar    2.0 m  
Nemuro-shi HanasakiInitial Tsunami  15:34 JST 11 Mar    (-)    Slight  
Maximum Tsunami  15:57 JST 11 Mar    2.8 m  
Nemuro-koInitial Tsunami  16:08 JST 11 Mar    (+)    0.3 m  
Maximum Tsunami  16:22 JST 11 Mar    0.3 m  
Hamanaka-cho Kiritappu-koInitial Tsunami  15:27 JST 11 Mar    (-)    Slight  
Maximum Tsunami  17:27 JST 11 Mar    2.3 m  
UrakawaInitial Tsunami  15:19 JST 11 Mar    (-)    0.2 m  
Maximum Tsunami  16:42 JST 11 Mar    2.7 m  
Tokachi-ko Initial Tsunami  15:26 JST 11 Mar    (-)    0.2 m  
Maximum Tsunami  15:57 JST 11 Mar    2.8 m or more  
Erimo-cho ShoyaInitial Tsunami  15:18 JST 11 Mar    (-)    0.1 m  
Maximum Tsunami  15:44 JST 11 Mar    3.5 m  
HakodateInitial Tsunami  16:11 JST 11 Mar    (+)    1.9 m  
Maximum Tsunami  16:32 JST 11 Mar    1.9 m  
Tomakomai-nishiko Initial Tsunami  15:37 JST 11 Mar    (-)    0.2 m  
Maximum Tsunami  17:30 JST 11 Mar    2.1 m  
Tomakomai-higashiko Initial Tsunami  15:40 JST 11 Mar    (-)    0.2 m  
Maximum Tsunami  16:17 JST 11 Mar    2.5 m  
Shiraoi-koInitial Tsunami  15:40 JST 11 Mar    (-)    0.1 m  
Maximum Tsunami  16:01 JST 11 Mar    1.8 m  
Oshima Mori-koInitial Tsunami  15:56 JST 11 Mar    (-)    Slight  
Maximum Tsunami  17:08 JST 11 Mar    1.2 m  
Muroran-koInitial Tsunami  15:56 JST 11 Mar    (-)    Slight  
Maximum Tsunami  16:29 JST 11 Mar    0.9 m  
AbashiriInitial Tsunami  17:02 JST 11 Mar    (+)    0.1 m  
Maximum Tsunami  17:14 JST 11 Mar    0.1 m  
Esashi-ko Initial Tsunami  17:45 JST 11 Mar    (+)    0.2 m  
Maximum Tsunami  17:59 JST 11 Mar    0.2 m  
TappiInitial Tsunami  16:09 JST 11 Mar    (+)    0.5 m  
Maximum Tsunami  16:32 JST 11 Mar    0.5 m  
HachinoheInitial Tsunami  15:22 JST 11 Mar    (-)    0.8 m  
Maximum Tsunami  16:51 JST 11 Mar    2.7 m  
Mutsu-shi SekinehamaInitial Tsunami  15:20 JST 11 Mar    (-)    0.1 m  
Maximum Tsunami  15:57 JST 11 Mar    2.1 m  
MiyakoInitial Tsunami  14:48 JST 11 Mar    (+)    0.2 m  
Maximum Tsunami  15:21 JST 11 Mar    4.0 m or more  
OfunatoInitial Tsunami  14:46 JST 11 Mar    (-)    0.2 m  
Maximum Tsunami  15:15 JST 11 Mar    3.2 m or more  
KamaishiInitial Tsunami  14:45 JST 11 Mar    (-)    0.1 m  
Maximum Tsunami  15:21 JST 11 Mar    4.1 m or more  
Iwate Kamaishi-oki*Initial Tsunami  14:50 JST 11 Mar    Unknown
Iwate Miyako-oki*Initial Tsunami  14:50 JST 11 Mar    Unknown
Iwate Kuji-oki*Initial Tsunami  14:56 JST 11 Mar    Unknown
Ishinomaki-shi AyukawaInitial Tsunami  14:46 JST 11 Mar    (+)    0.1 m  
Maximum Tsunami  15:20 JST 11 Mar    3.3 m or more  
Kesennuma Hirotawan-oki*Initial Tsunami  14:54 JST 11 Mar    Unknown
SomaInitial Tsunami  14:55 JST 11 Mar    (+)    0.3 m  
Maximum Tsunami  15:50 JST 11 Mar    7.3 m or more  
Fukushima Onahama-oki*Initial Tsunami  14:52 JST 11 Mar    Unknown
OaraiInitial Tsunami  15:15 JST 11 Mar    (+)    1.8 m  
Maximum Tsunami  16:52 JST 11 Mar    4.2 m  
ChoshiInitial Tsunami  15:13 JST 11 Mar    (+)    0.4 m  
Maximum Tsunami  15:37 JST 11 Mar    2.2 m  
Tateyama-shi MeraInitial Tsunami  15:29 JST 11 Mar    (+)    1.3 m  
Maximum Tsunami  17:05 JST 11 Mar    1.6 m  
Tokyo HarumiInitial Tsunami  16:37 JST 11 Mar    (+)    0.8 m  
Maximum Tsunami  17:08 JST 11 Mar    0.8 m  
YokosukaInitial Tsunami  15:52 JST 11 Mar    (+)    0.9 m  
Maximum Tsunami  17:16 JST 11 Mar    1.6 m  
ChibaInitial Tsunami  16:38 JST 11 Mar    (+)    0.7 m  
Maximum Tsunami  17:09 JST 11 Mar    0.7 m  
YokohamaInitial Tsunami  16:09 JST 11 Mar    (+)    0.8 m  
Maximum Tsunami  17:37 JST 11 Mar    1.6 m  
Izu-oshima OkadaInitial Tsunami  14:52 JST 11 Mar    (-)    0.3 m  
Maximum Tsunami  15:49 JST 11 Mar    0.7 m  
Miyakejima TsubotaInitial Tsunami  15:26 JST 11 Mar    Unknown
Maximum Tsunami  15:34 JST 11 Mar    0.8 m  
Hachijojima YaeneInitial Tsunami  15:40 JST 11 Mar    (+)    1.4 m  
Maximum Tsunami  15:48 JST 11 Mar    1.4 m  
Kozushima Kozushima-ko Initial Tsunami  15:40 JST 11 Mar    (+)    0.4 m  
Maximum Tsunami  15:49 JST 11 Mar    0.6 m  
Miyakejima AkoInitial Tsunami  15:27 JST 11 Mar    (+)    0.6 m  
Maximum Tsunami  15:39 JST 11 Mar    0.6 m  
Hachijojima KaminatoInitial Tsunami  15:35 JST 11 Mar    (+)    1.2 m  
Maximum Tsunami  15:45 JST 11 Mar    1.2 m  
Chichijima FutamiInitial Tsunami  16:14 JST 11 Mar    (+)    1.0 m  
Maximum Tsunami  16:46 JST 11 Mar    1.8 m  
Minami-torishimaInitial Tsunami  16:51 JST 11 Mar    (+)    0.5 m  
Maximum Tsunami  16:55 JST 11 Mar    0.5 m  
OdawaraInitial Tsunami  15:33 JST 11 Mar    (+)    0.9 m  
Maximum Tsunami  15:48 JST 11 Mar    0.9 m  
Numazu-shi UchiuraInitial Tsunami  16:01 JST 11 Mar    (+)    1.4 m  
Maximum Tsunami  16:16 JST 11 Mar    1.4 m  
ShimizuInitial Tsunami  15:58 JST 11 Mar    (+)    0.9 m  
Maximum Tsunami  16:17 JST 11 Mar    0.9 m  
Minami-izu-cho IrozakiInitial Tsunami  15:43 JST 11 Mar    (+)    0.2 m  
Maximum Tsunami  15:56 JST 11 Mar    0.8 m  
OmaezakiInitial Tsunami  16:03 JST 11 Mar    (+)    1.0 m  
Maximum Tsunami  17:18 JST 11 Mar    1.4 m  
MaisakaInitial Tsunami  16:12 JST 11 Mar    (+)    0.7 m  
Maximum Tsunami  17:37 JST 11 Mar    0.8 m  
Shimoda-koInitial Tsunami  15:41 JST 11 Mar    (+)    0.7 m  
Maximum Tsunami  15:57 JST 11 Mar    0.7 m  
ItoInitial Tsunami  15:30 JST 11 Mar    (+)    0.1 m  
Maximum Tsunami  15:52 JST 11 Mar    0.7 m  
Nishiizu-cho TagoInitial Tsunami  15:55 JST 11 Mar    (+)    0.4 m  
Maximum Tsunami  16:18 JST 11 Mar    0.4 m  
YaizuInitial Tsunami  15:58 JST 11 Mar    (+)    0.8 m  
Maximum Tsunami  16:10 JST 11 Mar    0.8 m  
Tahara-shi AkabaneInitial Tsunami  16:21 JST 11 Mar    (+)    1.1 m  
Maximum Tsunami  17:32 JST 11 Mar    1.6 m  
Handa-shi KinuuraInitial Tsunami  17:18 JST 11 Mar    (+)    0.5 m  
Maximum Tsunami  17:36 JST 11 Mar    0.5 m  
YokkaichiInitial Tsunami  17:20 JST 11 Mar    (+)    0.4 m  
Maximum Tsunami  17:42 JST 11 Mar    0.4 m  
Toyohashi-shi Mikawa-koInitial Tsunami  17:17 JST 11 Mar    (+)    0.4 m  
Maximum Tsunami  17:46 JST 11 Mar    0.4 m  
TobaInitial Tsunami  16:34 JST 11 Mar    (+)    0.5 m  
Maximum Tsunami  18:00 JST 11 Mar    1.4 m  
OwaseInitial Tsunami  16:17 JST 11 Mar    (+)    1.0 m  
Maximum Tsunami  17:12 JST 11 Mar    1.7 m  
Kumano-shi YukiInitial Tsunami  16:12 JST 11 Mar    (+)    0.7 m  
Maximum Tsunami  16:28 JST 11 Mar    0.7 m  
Mie Owase-oki*Initial Tsunami  16:07 JST 11 Mar    Unknown
Misaki-cho TannowaInitial Tsunami  17:30 JST 11 Mar    (+)    0.2 m  
Maximum Tsunami  17:59 JST 11 Mar    0.2 m  
KobeInitial Tsunami  17:56 JST 11 Mar    Unknown
Maximum Tsunami  18:12 JST 11 Mar  (Unknown)
SumotoInitial Tsunami  17:20 JST 11 Mar    (+)    0.2 m  
Maximum Tsunami  17:37 JST 11 Mar    0.2 m  
Nachi-katsuura-cho UragamiInitial Tsunami  16:14 JST 11 Mar    (+)    0.9 m  
Maximum Tsunami  18:06 JST 11 Mar    1.3 m  
Kushimoto-cho Fukuro-koInitial Tsunami  16:16 JST 11 Mar    (+)    0.7 m  
Maximum Tsunami  17:38 JST 11 Mar    0.8 m  
WakayamaInitial Tsunami  17:13 JST 11 Mar    (+)    0.6 m  
Maximum Tsunami  17:32 JST 11 Mar    0.6 m  
Gobo-shi HaraidoInitial Tsunami  16:35 JST 11 Mar    (+)    0.7 m  
Maximum Tsunami  17:57 JST 11 Mar    1.1 m  
Shirahama-cho KatataInitial Tsunami  16:34 JST 11 Mar    (+)    0.9 m  
Maximum Tsunami  17:58 JST 11 Mar    0.9 m  
Wakayama Shirahama-oki*Initial Tsunami  16:25 JST 11 Mar    Unknown
KomatsushimaInitial Tsunami  17:03 JST 11 Mar    (+)    0.7 m  
Maximum Tsunami  17:24 JST 11 Mar    0.7 m  
Tokushima YukiInitial Tsunami  16:37 JST 11 Mar    (+)    1.0 m  
Maximum Tsunami  16:55 JST 11 Mar    1.0 m  
UwajimaInitial Tsunami  17:42 JST 11 Mar    (+)    0.5 m  
Maximum Tsunami  17:59 JST 11 Mar    0.5 m  
Muroto-shi Muroto-misakiInitial Tsunami  16:39 JST 11 Mar    (+)    0.4 m  
Maximum Tsunami  16:49 JST 11 Mar    0.4 m  
KochiInitial Tsunami  16:56 JST 11 Mar    (+)    0.6 m  
Maximum Tsunami  17:12 JST 11 Mar    0.6 m  
Tosa-shimizuInitial Tsunami  16:56 JST 11 Mar    (+)    0.9 m  
Maximum Tsunami  17:11 JST 11 Mar    0.9 m  
Susaki-koInitial Tsunami  17:00 JST 11 Mar    (+)    1.4 m  
Maximum Tsunami  17:20 JST 11 Mar    1.4 m  
Saiki-shi MatsuuraInitial Tsunami  17:20 JST 11 Mar    (+)    0.5 m  
Maximum Tsunami  18:12 JST 11 Mar  (Unknown)
Hyuga-shi HososhimaInitial Tsunami  16:54 JST 11 Mar    (+)    0.8 m  
Maximum Tsunami  17:20 JST 11 Mar    0.8 m  
Nichinan-shi AburatsuInitial Tsunami  17:05 JST 11 Mar    (+)    1.0 m  
Maximum Tsunami  17:19 JST 11 Mar    1.0 m  
Miyazaki-koInitial Tsunami  17:06 JST 11 Mar    (+)    1.4 m  
Maximum Tsunami  17:29 JST 11 Mar    1.4 m  
Minami-osumi-cho OdomariInitial Tsunami  17:29 JST 11 Mar    (+)    0.5 m  
Maximum Tsunami  17:40 JST 11 Mar    0.5 m  
Shibushi-koInitial Tsunami  17:12 JST 11 Mar    (+)    1.1 m  
Maximum Tsunami  17:39 JST 11 Mar    1.1 m  
Tanegashima Nishino-omoteInitial Tsunami  17:20 JST 11 Mar    (+)    0.2 m  
Maximum Tsunami  17:31 JST 11 Mar    0.2 m  
Tanegashima KumanoInitial Tsunami  16:52 JST 11 Mar    (+)    0.8 m  
Maximum Tsunami  17:16 JST 11 Mar    0.8 m  
Amami-shi KominatoInitial Tsunami  17:01 JST 11 Mar    (-)    0.1 m  
Maximum Tsunami  17:41 JST 11 Mar    1.1 m  
Amami-shi NazeInitial Tsunami  17:10 JST 11 Mar    (+)    0.4 m  
Maximum Tsunami  17:44 JST 11 Mar    0.4 m  
Nanjo-shi AzamaInitial Tsunami  17:49 JST 11 Mar    (+)    0.3 m  
Maximum Tsunami  17:59 JST 11 Mar    0.3 m  
Minami-daito-gyokoInitial Tsunami  17:11 JST 11 Mar    (+)    0.2 m  
Maximum Tsunami  17:24 JST 11 Mar    0.2 m  

Tsunami Warnings and/or Advisories are in currently effect for the following coastal regions of Japan:
<Tsunami Warning (Major Tsunami)>
  IWATE PREF.
  MIYAGI PREF.
  FUKUSHIMA PREF.
  CENTRAL PART OF PACIFIC COAST OF HOKKAIDO
  PACIFIC COAST OF AOMORI PREF.
  IBARAKI PREF.
  KUJUKURI AND SOTOBO AREA, CHIBA PREF.
  IZU ISLANDS
  EASTERN PART OF PACIFIC COAST OF HOKKAIDO
  WESTERN PART OF PACIFIC COAST OF HOKKAIDO
  JAPAN SEA COAST OF AOMORI PREF.
  UCHIBO AREA, CHIBA PREF.
  OGASAWARA ISLANDS
  SAGAMI BAY AND MIURA PENINSULA
  SHIZUOKA PREF.
  WAKAYAMA PREF.
  TOKUSHIMA PREF.
<Tsunami Warning (Tsunami)>
  PACIFIC COAST OF AICHI PREF.
  SOUTHERN PART OF MIE PREF.
  KOCHI PREF.
  MIYAZAKI PREF.
  TANEGASHIMA AND YAKUSHIMA AREA
  AMAMI ISLANDS AND TOKARA ISLANDS
  SOUTHERN PART OF JAPAN SEA COAST OF HOKKAIDO
  MUTSU BAY
  TOKYO BAY
  ISE BAY AND MIKAWA BAY
  SOUTHERN PART OF AWAJI ISLAND
  BUNGO STRAIT COAST OF EHIME PREF.
  SETONAIKAI COAST OF OITA PREF.
  BUNGO STRAIT COAST OF OITA PREF.
  EASTERN PART OF KAGOSHIMA PREF.
  WESTERN PART OF KAGOSHIMA PREF.
  OKINAWA ISLANDS
  DAITOJIMA AREA
  MIYAKOJIMA AND YAEYAMA AREA
<Tsunami Advisory>
  OKHOTSK SEA COAST OF HOKKAIDO
  OSAKA PREF.
  SETONAIKAI COAST OF HYOGO PREF.
  OKAYAMA PREF.
  KAGAWA PREF.
  SETONAIKAI COAST OF EHIME PREF.
  ARIAKE SEA AND YATSUSHIRO SEA
  WESTERN PART OF NAGASAKI PREF.
  AMAKUSA NADA COAST OF KUMAMOTO PREF.
  AKITA PREF.
  YAMAGATA PREF.
  NIIGATA PREF.,EXCEPT SADOGASHIMA ISLAND
  SADOGASHIMA ISLAND
  TOYAMA PREF.
  NOTO AREA, ISHIKAWA PREF.
  HIROSHIMA PREF.
  SETONAIKAI COAST OF YAMAGUCHI PREF.
Although there may be slight sea-level changes in coastal regions other than the above, no tsunami damage is expected in those coastal regions.

Earthquake Information
 Occurred at 14:46 JST 11 Mar 2011
 Region name SANRIKU OKI
 Latitude38.1N
 Longitude142.9E
 Depth about 20 km
 Magnitude 8.8

*** [Tsunami Observed by offshore GPS buoys(marked with *)] ***

Please note that heights of all tsunamis observed by offshore GPS buoys are described as Unknown in the above text in order to avoid confusion with those observed by tidal stations in coastal areas.
Below are the details of tsunamis observed by offshore GPS buoys.

Iwate Kamaishi-oki*Initial Tsunami  14:50 JST 11 Mar    (-)    0.3 m  
Maximum Tsunami  15:12 JST 11 Mar    6.8 m  
Iwate Miyako-oki*Initial Tsunami  14:50 JST 11 Mar    (-)    0.4 m  
Maximum Tsunami  15:12 JST 11 Mar    6.3 m  
Iwate Kuji-oki*Initial Tsunami  14:56 JST 11 Mar    (-)    0.4 m  
Maximum Tsunami      Arrival of maximum tsunami expected.  
Kesennuma Hirotawan-oki*Initial Tsunami  14:54 JST 11 Mar    (+)    6.0 m  
Maximum Tsunami  15:14 JST 11 Mar    6.0 m  
Fukushima Onahama-oki*Initial Tsunami  14:52 JST 11 Mar    (+)    1.0 m  
Maximum Tsunami  15:04 JST 11 Mar    1.0 m  
Mie Owase-oki*Initial Tsunami  16:07 JST 11 Mar    (+)    0.5 m  
Maximum Tsunami  16:26 JST 11 Mar    0.5 m  
Wakayama Shirahama-oki*Initial Tsunami  16:25 JST 11 Mar    (+)    0.3 m  
Maximum Tsunami  16:38 JST 11 Mar    0.3 m  

All tsunamis described here were observed offshore, and are therefore expected to increase in size by the time they reach coastal areas.

** [Estimated tsunami heights and arrivals times at coastal areas near offshore GPS buoys] **
Below are the estimated tsunami heights and arrival times at coastal areas near offshore GPS buoys.

Estimated Tsunami Arrival TimeEstimated Tsunami Height
Iwate Kamaishi  14:55 - 15:10 JST 10 Mar    6 m - 10 m or more  
Iwate Miyako  14:55 - 15:10 JST 10 Mar    6 m - 10 m or more  
Iwate Kuji  15:01 - 15:16 JST 11 Mar    1 m - 2 m  
Kesennuma Hirotawan  14:59 - 15:14 JST 10 Mar    6 m - 10 m or more  
Fukushima Onahama  14:57 - 15:12 JST 10 Mar    1 m - 4 m  
Mie Owase  16:12 - 16:27 JST 11 Mar    1 m - 2 m  
Wakayama Shirahama  16:30 - 16:45 JST 11 Mar    0.5 m  

Tsunamis may have already arrived in some areas.