Station Information

Station ID: 721
Latitude: 40.8975
Longitude: 140.859167
Coastline code: 647
Station code: 121
Country: JAPAN
Time span of data: 1954 – 2017
Completeness (%): 98
Link to ellipsoid: Available
Date of last update: 20 Feb 2018

Green Arrow: Current Station
Yellow Marker: Neighbouring RLR 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.

Additional Data Sources (guide to additional data sources)

Nearby GNSS Stations from SONEL: P103

Station Documentation

Link to RLR information.
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 11-Jun-1991
Asamushi 647/121 RLR(1974) is 9.9m below BM Attach-15
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 17-Nov-2009
The relevant authority for this station is the Geographical Survey Institute. For some reason the data for 1998 was not downloaded from this authority. Data downloaded and entered 17.11.09.
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 21-Feb-2012
A massive earthquake magnitude 9.0 occurred at 14:46 JST (05:46 UTC) on Friday 11th March 2011 with the epicentre approx. 70km east of the Oshika Peninsula of Tohoku. It was the most powerful known earthquake to hit Japan and triggered a tsunami with waves up to 40.5m travelling up to 10km inland.
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 13-Mar-2014
The GPS benchmark information has been downloaded from the SONEL website. The GPS benchmark is P103 14.111m above RLR.

Data Authority

Geographical Survey Institute
Kitasato -1
Ibaraki-ken 305