=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 01-Jul-1994
27 November 1991: New Installation
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 29-Aug-1995
A destructive earthquake and tsunami occurred in the Kuril Islands on 4 October 1994 - see Earth System Monitor, 5(4), June 1995.
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 20-Nov-2003
Datum 1998 is 1.507m 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 known earthquake to hit Japan. The earhtqake triggered a tsunami with waves of up to 40.5m travelling up to 10km inland.
Where more than one benchmark has the same name a suffix has been added
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 13-Mar-2014
The GPS benchmark information has been downloaded from the SONEL website. GPS benchmark P201 is 11.706m above RLR.