A marine seismic energy source includes a seismic tow cable configured to be towed by a vessel from one end and at least one seismic source coupled proximate another end of the tow cable. The at least one seismic source is associated with a depth controller. The depth controller is configured to move the seismic source to a selectable depth in a body of water.

 
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> Discriminating natural fracture- and stress-induced sonic anisotropy using a combination of image and sonic logs

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