From: rking164@comcast.net   
      
   Of some interest would be the classified military technology which may be used   
   for finding enemy underground hangouts. Ability is enhanced if sensor   
   equipment on ground overhead.   
   Seismic sensors may be attached to undeground robots.   
   Sonar, as in sunmarines, for guidance and control.   
   The wolf in sheeps clothing gives missiles away to randomly fire at civilian   
   terrtory  while accusing another of war crime.   
   US needs to test its equipment if ever any need to check out Iran's military   
   sunterranean labyrinths.   
   Extreme depth similar to looking for oil, I guess.   
      
   Refraction prospecting uses refracted waves from near-surface explosions and   
   subsurface layering. It is detailed on a smaller scale, particularly for   
   unknown geology. It is a powerful tool of petroleum seismology and theoretical   
   seismology for    
   investigating the basement, depth and crustal structure.   
      
   The generation of seismic waves involves explosion of a dynamite charge in a   
   hole or weight dropping. Truck mounted mechanical vibrators (Vibroseis) to   
   pass an extended vibration of low amplitude into the ground and continuously   
   varying frequency between    
   10 and 80 Hz. In marine seismic study, an electric or gas spark or air gun   
   shot is used as an energy source. Device used to detect and receive seismic   
   ground motion are called “Seismometer” or “Geophone.” It is an   
   electromechanical device used to    
   convert mechanical input (seismic pulse) into electrical output and ultimately   
   produce a continuous graph “Seismograph.” The modern seismic survey   
   simultaneously records ground motions receiving from all directions due to   
   combinations of transverse    
   and longitudinal waves by a three-component geophone   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)