Large spike in the dataset Nov. 2000 - data flagged.
Documentation added 2011-02-22
Sea level profile compares well with that for Mikuni.
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. 70km east of the Oshika Peninsula Tohoku. It was the most powerful known earthquake tp hit Japan.The earthquake triggered tsunami waves of up to 40.5m travelling up to 10km inland.
Documentation added 2014-03-13
The GPS benchmark information has been downloaded from the SONEL website. GPS benchmark P111 is 13.494m above RLR.
Geographical Survey Institute Kitasato -1 Tsukuba-shi Ibaraki-ken 305