FIG. IT 
PIEZOELECTRIC RECORDS SHOWING SURFACE REF! p 
FOR A GHARGE AND GE DEPTH f e wets ene ae OSTA! 
UES OF WI/9/R AT GAUGE ARE, FROM TOP TO BOTTOM, 0.657) 0.328, 0.2/6, ANC 
RECORDS 400-| AND 4CO-2 WERE ACTULLY OBTAINED WiTH A 500 
aL DISTANCES WERE SCALEO AGCORDINGLY 
