Shotpoint 

 If 



Figure 19. Cross Section from Seismic Data Like that in Figure 18 and 

 Drill-Hole Data from PIC. Energy transmission is slow and 

 poor in the peat. Arrivals below the time step on Figure 

 18 indicate energy transmitted by sediment above the peat. 

 Arrivals plotted above the time step indicate energy taking 

 a path down through the peat into the clay and returning 

 through the peat from the lower strata. A low seismic 

 velocity of perhaps 1000 feet per second would introduce 

 the time gap indicated by the time-distance plot. 



29 



