Data and Station Information for ASAMUSHI

Station Information

Station ID:	721
Latitude:	40.8975
Longitude:	140.859167
Coastline code:	647
Station code:	121
Country:	JAPAN
Time span of data:	1954 – 2024
Completeness (%):	98
Link to ellipsoid:	Available
Date of last update:	21 Mar 2025

Green Arrow:	Current Station
Yellow Marker:	Neighbouring RLR Station
Red Marker:	Neighbouring Metric Station

Please note: In many cases, the station position in our database is accurate to only one minute. Thus, the tide gauge may not appear to be on the coast.

Tide Gauge Data

Plot of monthly mean sea level data at ASAMUSHI.

Link to larger image of monthly data plot.
Download monthly mean sea level data.

Plot of annual mean sea level data at ASAMUSHI.

Link to larger image of annual data plot.
Download annual mean sea level data.

Download metric sea level data. Use only with extreme caution. NOTE: If some of the data are red in the plots above, the 'flag for attention' is set. Please see the documentation below.

Additional Data Sources (guide to additional data sources)

Nearby GNSS Stations from SONEL: P103

Station Documentation

Link to RLR information.

Documentation added 1991-06-11

Asamushi 647/121 RLR(1974) is 9.9m below BM Attach-15

Documentation added 2009-11-17

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.

Documentation added 2012-02-21

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.

Documentation added 2014-03-13

The GPS benchmark information has been downloaded from the SONEL website. The GPS benchmark is P103 14.111m above RLR.

Data Authority

Geographical Survey Institute
Kitasato -1
Tsukuba-shi
Ibaraki-ken 305

Data

Data Notes

Extracted from Database

ASAMUSHI