Japanese
About Us Access Links Site Map
Home
Weather/Earthquake
News Releases
Services
For Tourists/Residents
For NMHSs
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 11:45 JST 09 Mar 2011
Region name Sanriku Oki
Depth about 10 km
Magnitude 7.3
Initial Tsunami Observation
Click the map to zoom in

Maximum Tsunami Observation

Tsunami Information NUMBER 11
(Tsunami Observations)

Issued at 15:03 JST 09 Mar 2011

Tsunami Observations
As of 14:55 JST
In some coastal regions, it is inferred that tsunamis higher than those recorded at observation sites have arrived.

HachinoheInitial Tsunami  12:46 JST 09 Mar    (+)    0.1 m  
Maximum Tsunami  13:46 JST 09 Mar    0.2 m  
Mutsu-shi SekinehamaInitial Tsunami  12:55 JST 09 Mar    (-)    0.2 m  
Maximum Tsunami  13:08 JST 09 Mar    0.2 m  
Mutsuogawara-koInitial Tsunami  12:41 JST 09 Mar    (+)    0.1 m  
Maximum Tsunami  13:41 JST 09 Mar    0.2 m  
MiyakoInitial Tsunami  12:11 JST 09 Mar    (-)    Slight  
Maximum Tsunami  13:04 JST 09 Mar    0.3 m  
OfunatoInitial Tsunami  12:08 JST 09 Mar    (-)    0.1 m  
Maximum Tsunami  12:16 JST 09 Mar    0.6 m  
KamaishiInitial Tsunami  12:09 JST 09 Mar    (-)    Slight  
Maximum Tsunami  12:18 JST 09 Mar    0.4 m  
Kuji-koInitial Tsunami  12:33 JST 09 Mar    (+)    0.4 m  
Maximum Tsunami  13:13 JST 09 Mar    0.5 m  
Iwate Kamaishi-oki*Initial Tsunami  12:02 JST 09 Mar    Unknown
Iwate Miyako-oki*Initial Tsunami  12:05 JST 09 Mar    Unknown
Iwate Kuji-oki*Initial Tsunami  12:18 JST 09 Mar    Unknown
Ishinomaki-shi AyukawaInitial Tsunami  12:13 JST 09 Mar    (-)    Slight  
Maximum Tsunami  12:25 JST 09 Mar    0.5 m  
Sendai-koInitial Tsunami  12:54 JST 09 Mar    (-)    Slight  
Maximum Tsunami  12:59 JST 09 Mar    0.3 m  
Miyagi Kinkasan-oki*Initial Tsunami  12:07 JST 09 Mar    Unknown
Kesennuma Hirotawan-oki*Initial Tsunami  12:00 JST 09 Mar    Unknown
Iwaki-shi OnahamaInitial Tsunami  12:37 JST 09 Mar    (+)    0.1 m  
Maximum Tsunami  14:01 JST 09 Mar    0.2 m  
SomaInitial Tsunami  12:51 JST 09 Mar    (-)    Slight  
Maximum Tsunami  13:03 JST 09 Mar    0.2 m  
Fukushima Onahama-oki*Initial Tsunami  12:25 JST 09 Mar    Unknown

No Tsunami Warnings and Advisories are currently in effect. Pay attention when fishing, swimming or engaging in other activities in the above coastal regions, as there may be still sea-level changes for the time being.

Earthquake Information
 Occurred at 11:45 JST 09 Mar 2011
 Region name SANRIKU OKI
 Latitude38.3N
 Longitude143.3E
 Depth about 10 km
 Magnitude 7.3

*** [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  12:02 JST 09 Mar    (+)    0.1 m  
Maximum Tsunami  12:06 JST 09 Mar    0.1 m  
Iwate Miyako-oki*Initial Tsunami  12:05 JST 09 Mar    (+)    0.1 m  
Maximum Tsunami  12:10 JST 09 Mar    0.1 m  
Iwate Kuji-oki*Initial Tsunami  12:18 JST 09 Mar    (+)    Slight  
Maximum Tsunami  14:22 JST 09 Mar    0.1 m  
Miyagi Kinkasan-oki*Initial Tsunami  12:07 JST 09 Mar    (+)    0.2 m  
Maximum Tsunami  12:13 JST 09 Mar    0.2 m  
Kesennuma Hirotawan-oki*Initial Tsunami  12:00 JST 09 Mar    (+)    0.2 m  
Maximum Tsunami  12:07 JST 09 Mar    0.2 m  
Fukushima Onahama-oki*Initial Tsunami  12:25 JST 09 Mar    (-)    Slight  
Maximum Tsunami  14:37 JST 09 Mar    0.1 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  12:07 - 12:22 JST 09 Mar    0.5 m  
Iwate Miyako  12:10 - 12:25 JST 09 Mar    0.5 m  
Iwate Kuji  12:23 - 12:38 JST 09 Mar    0.5 m  
Miyagi Kinkasan  12:12 - 12:27 JST 09 Mar    0.5 m  
Kesennuma Hirotawan  12:05 - 12:20 JST 09 Mar    0.5 m  
Fukushima Onahama  12:30 - 12:45 JST 09 Mar    0.5 m  

Tsunamis may have already arrived in some areas.