References
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AUTHOR     = H. Berckemer and others
YEAR       = 75
FIGNUMBER  = 4d
SOURCE     = Afar Depression of Ethiopia. Scientific report No.14. 
             Symposioum held in Bad Bergzabern, F.R.Germany Apr 1,
             1974. Vol 1 pag 89-107
TITLE      = Deep seismic soundings in the Afar region and on the 
             highland of Ethiopia


Although quite conventional in principle, the actual field 
observations were rather unconventional due to the extreme and 
adverse environmental conditions, in particular in north Afar.  
Seismic measurements were made along 5 profiles 120-300 km long in 
different parts of the Afar Depression and, for reference, at a 
profile on the Ethiopian Plateau.  Seismic pulses were generated by 
explosions at both ends of the line, preferably in lakes or rivers 
with charges ranging from 300 to 1600 kp.  A particular shooting 
technique was used which yielded high seismic efficiency even from 
explosions in very shallow water.  15 mobile recording stations, 
5-7 km appart were installed in a Landrover and consisted of a four 
channel magnetic tape recording seismograph system MARS 66, a short 
wave time signal receiver, a transceiver for intercommunication and 
two operators.  A vertical and horizontal component seismometer 
were buried near the recorder and another vertical component some 
200-400 m away on the profile. The position of each station was 
determined astronomically using a Zeiss Ni2-Astrolab.

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