=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 11-Jun-1991
Uwagima II          644/022 RLR(1975) is 8.5m below Attached BM
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 20-Nov-2003
Datum 2001 is 2.277m below Tokyo Peil.
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 22-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 earthquake to ever hit Japan triggering a tsunami with waves of up to 40.5m high and travelling up to 10km inland.
Where there is more than one benchmark with the same name a suffix has been added