36 



THE NAVY OCEAN SCIENCE PROGRAM 



100- 

 904- 

 80-- 

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 60-- 

 50-- 

 40-- 

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 20-- 

 I0-- 

 0-- 



TIME 



0430 



12 JUNE 



0445 

 1963 



0500 



Profile of magnetic anomaly over THRESHER as recorded near 

 the ocean floor, during passage over the wreckage 



Further development of our knowledge of the magnetic field 

 of the earth is an important concern of the Navy, particularly 

 for use in search-and-salvage operations and in undersea 

 warfare. 



Heat-flow measurements are being made at varied locations 

 in the oceans to indicate processes occurring in the underlying 

 crustal and mantle rocks. It has been found, quite unexpectedly, 

 that the average heat-flow rates in the oceans are nearly the 

 same as average rates in the continents, despite the thicker 

 continental crust with a higher concentration of radioactive 



