Osaka 643/021 RLR(1976) is 8.3m below Attached BM W61
Documentation added 1994-07-15
Pugh, 1987 (Tides, surges and mean sea-level. Wiley) refers to subsidence at Osaka caused by ground water extraction.
Documentation added 2003-11-20
Datum 2001 is 3.583m below Tokyo Peil.
Documentation added 2012-02-21
A massive earthquake magnitude 9.0 occurred at 14.46 JST (05.40 UTC) on Friday 11th March 2011 with the epicentre approx. 70 km east of the Oshika Peninsula of Tohoku. It was themost powerful earthquake known to have hit Japan triggering a tsunami with waves up to 40.5m and travelling up to 10km inland.
Marine Department Japan Meteorological Agency Ote-machi, Chiyoda-ku Tokyo