=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 11-JUN-91 :
Tosa Shimizu        644/011 RLR(1976) is 9.7m below Attached BM
=========================== BENCHMARK INFORMATION UPDATE ADDED  12-JUL-93 :
Tosa Shimizu        644/011 RLR(1976) is 9.7m below Attached BM
=========================== 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 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 and travelling up to 10km inland.

