Station Information

Station ID: 635
Latitude: 36.9375
Longitude: 140.891944
Coastline code: 642
Station code: 41
Country: JAPAN
Time span of data: 1951 – 2017
Completeness (%): 98
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.

Station Documentation

Link to RLR information.
Gauge re-sited 1/7/77
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 11-Jun-1991
Onahama 642/041 RLR(1965) is 9.0m below Attached BM
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 12-Jul-1993
Positive secular trend reverses into a negative one during the 1970s.
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 21-Feb-2012
A massive earthquake of magnitude 9.0 occurred 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 and travelling up to 10km inland. It looks as if the earthquake badly damaged the tide gauge at Onahama as there is a jump and then it stops working in July 2011. Data following the earthquake has been flagged.
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 04-Feb-2013
There have over the years been a number of different benchmarks because of space restrictions not all are included on the RLR diagram. Where two or more benchmarks have the same name the later are suffixed. Throughout the RLR factor has remained the same.

Data Authority

Marine Department
Japan Meteorological Agency
Ote-machi, Chiyoda-ku