AUTHOR     = A.S. Laughton andC. Tramontini
YEAR       = 69
FIGNUMBER  = Generated from table I
SOURCE     = Tectonophysics, Vol 8 (1969), 359-375
TITLE      = Recent Studies of the Crustal Structure in the 
             Gulf of Aden

About the experiment in general ...
The data for this profile was obtained during an expedition 
in R.R.S. "Discovery", Spring of 1967.  One of the objectives 
of this experiment was to determine the crustal structure by 
the seismic refraction method in areas critical to the theory 
of continental separation.
Two reversed and four unreversed seismic refraction stations 
were shot using the Hill technique of sono-radio buoys and 
single ship shooting.  Shots were fired during the night 
between 23.00 and 4.00 because experience showd that this 
time was most free from radio interference.  Arrivals were 
obtained out to a maximum range of 52 sec (80 km).    
Four buoys were usually laid covering a range of 1.5-3 miles 
(2.8-5.5 km).  At each station a profile of sound velocity 
in the sea to 820 fathoms (1,500 m) was obtained using a 
velocimeter.  The surface horizontal velocity could therefore 
be calculated for use in the reduction of the seismic data.

About this profile ...
The line was shot to the west and was not reversed. 

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