=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 11-JUN-91 :
Tan-nowa            643/017 RLR(1976) is 9.1m below Attached BM
=========================== BENCHMARK INFORMATION UPDATE ADDED  12-JUL-93 :
Tan-nowa            643/017 RLR(1976) is 9.1m below Attached BM
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 2003Nov20 :
Datum 1998 is 1.848m below Tokyo Peil.
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 24-Feb-2011 :   
Buddy checked with both Sumoto and Osaka compares well.
=========================== 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 triggering a
tsunami with waves up to 40.5m and travelling up to 10km inland.

