Station Information

Station ID: 131
Latitude: 38.296667
Longitude: 141.505278
Coastline code: 642
Station code: 31
Country: JAPAN
Time span of RLR data: 1958 – 2023
RLR completeness (%): 93
Time span of metric data: 1900 – 2023
Metric completeness (%): 70
Date of last update: 04 Mar 2024

Green Arrow: Current Station
Yellow Marker: Neighbouring RLR Station
Red Marker: Neighbouring Metric Station

Please note: In many cases, the station position in our database is accurate to only one minute. Thus, the tide gauge may not appear to be on the coast.

Station Documentation

Link to RLR information.

Documentation added 1991-06-11

Ayukawa 642/031 RLR(1963) is 9.6m below Attached BM

Documentation added 2009-05-05

From the dataset plot there appears to be a rising trend at this station.

Documentation added 2011-02-22

Profile buddy checks well with Ofunato II.

Documentation added 2012-02-21

A massive earthquake magnitude 9.0 occurred at 14:46 JST (05:46 UTC) on Friday 11th March 2011 with the epicenter approx. 70 km east of the Oshika Peninsula of Tohoku. It was the most powerful known earthquake ever to have hit Japan. The earthquake triggered tsunami waves up to 40.5m travelling up to 10km inland. As is obvious from the data plot the tide gauge site was badly effected. The data following the tsunami is flagged.

Documentation added 2022-04-05

Following review of data affected by the Tōhoku earthquake of 2011, all data has been flagged as good as GSI have recommenced levelling at the site. The station flag has been set to indicate the record needs to be treated with care, but the data appears to accurately reflect the earthquake's ongoing effect on local relative sea level.

Data Authority

Japan Meteorological Agency
3-6-9 Toranomon, Minato City