=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 11-Jun-1991
Asamushi            647/121 RLR(1974) is 9.9m below BM Attach-15
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 17-Nov-2009
The relevant authority for this station is the Geographical Survey Institute. For some reason the data for 1998 was not downloaded from this authority. Data downloaded and entered 17.11.09.
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 21-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 and triggered a tsunami with waves up to 40.5m travelling up to 10km inland.
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 13-Mar-2014
The GPS benchmark information has been downloaded from the SONEL website. The GPS benchmark is P103 14.111m above RLR.