GRF STATION INFORMATION

STATION INFORMATION
				  Elevation of			Start of
Code	  Latitude     Longitude   Sensor(M)*  Components	Operation 
GRA1 (GRF) 49.6919	11.2217		500	Z,N,E		Spring 1976
GRA2	   49.6552	11.3594	   	505	Z		Spring 1976
GRA3	   49.7622	11.3187	  	452	Z		Spring 1976
GRA4	   49.5654	11.4359	    	502	Z		Spring 1979
GRB1	   49.3913	11.6520   	502	Z,N,E		Spring 1978
GRB2	   49.2709	11.6700		543	Z		Spring 1978
GRB3	   49.3435	11.8060		519	Z		Spring 1978
GRB4	   49.4689	11.5608		510	Z		Spring 1979
GRB5	   49.1121	11.6767		515	Z		Fall 1979
GRC1	   48.9962	11.5214		513	Z,N,E		Spring 1979
GRC2	   48.8676	11.3755		447	Z		Spring 1980
GRC3	   48.8902	11.5858		445	Z		Spring 1979
GRC4	   49.0867	11.5263		505	Z		Fall 1979
* including depth

GEOLOGY:  Chalk and dolomite of Jurassic age (Malm) with a covering of a 
thin layer of sandy loam.

VAULT CONDITIONS: Inner vault fixed with concrete on hard bedrock.  Inner 
vault is thermally isolated and contained in a 2-4 m deep outer vault 
with a diameter of 2 meters.