1980 DATA SUSPECT - CONDUCTING TUBE IN BAD CONDITION
Documentation added 1991-06-11
Hosojima 645/011 RLR(1974) is 9.4m below BM Attach-4
Documentation added 2011-02-22
Previously data points for December 1979 - December 1980 had been flagged.However when the station was buddy checked with nearby station Aburatsu this period of the sea level profile shows the same pattern. Flag points were therefore removed. The profiles appear to separeate more during the 1990's onwards.
Documentation added 2012-02-21
A massive earthquake magnitude 9.0 ocurred at 14:46 JST (05:46 UTC) on Friday 11th March 2011 with the epicenter approx. 70km east of the Oshika Peninsula of Tohoku. It was the most powerful known earthquake to hit Japan. The earthquake triggered a tsunami with 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 is P122 13.797m above RLR.
Geographical Survey Institute Kitasato -1 Tsukuba-shi Ibaraki-ken 305