TABLE 2. Longitudinal plate-wave velocity data 

 taken in 1955. 



TABLE 3. Calculated ice thickness from seismic method vs meas- 

 ured ice thickness for 1955. 







Longitudinal 











Plate-Wave 









Range 

 (meters) 



Velocity 

 (meters /sec) 



Charge 



Date 



Size (lbs) 



Type 



3-27-1955 



913 



2191 ±40 





TNT 





1004 



2132 ±40 





TNT 





1096 



2118 ±40 





TNT 





457 



2271 ±40 





TNT 





639 



2147 ±40 





TNT 



3-30-1955 



457 



2252 ±40 



11/2 



C-3 





548 



2231 ±40 



11/2 



C-3 





640 



2164 ±40 



11/2 



C-3 





457 



2272 ± 40 





TNT 





548 



2248 ± 40 





TNT 





640 



2217 ±40 





TNT 





458 



2261 ± 40 



V2 



TNT 





549 



2219 ±40 



1/2 



TNT 





641 



2219 ±40 



1/2 



TNT 





913 



2193 ±40 



3 



TNT 





1004 



2140 ±40 



3 



TNT 





1096 



2154 ±40 



3 



TNT 



4-2-1955 



457 



2305 ± 40 



1/2 



C-3 





548 



2219 ±40 



1/2 



C-3 





639 



2238 ± 40 



1/2 



C-3 





457 



2286 ± 40 



1/2 



C-3 





549 



2255 ±40 



1/4 



C-3 





640 



2266 ± 40 



1/4 



C-3 





914 



2213 ±40 



1/8 



C-3 





914 



2210 ±40 



1/8 



C-3 





914 



2271 ±40 



1/4 



C-3 





1006 



2219 ±40 



1/4 



C-3 





1097 



2198 ±40 



1/4 



C-3 





914 



2225 ± 40 



1/4 



C-3 





1005 



2155 ±40 



1/4 



C-3 





1097 



2179 ±40 



1/4 



C-3 









Mean Measured 













Ice Thickness, 











Calculated Ice 



with Probable 









Range 

 (meters) 



Thickness 

 (cm) 



Error 

 (cm) 



Charge 



Date 



Size (lbs) 



Type 



3-27-1955 



457 



56.8 



69.2 ± 1.8 



1 



TNT 





457 



62.6 



69.2 ± 1.8 



1 



TNT 





639 



68.0 



105.9 ± 23.6 



1 



TNT 





639 



66.1 



105.9 ± 23.6 



1 



TNT 





909 



91.3 



69.8 ± 1.0 



10 



TNT 





1000 



83.5 



98.8 ± 19.6 



10 



TNT 





1092 



72.0 



94.8 ± 16.8 



10 



TNT 



3-30-1955 



458 



59.5 



69.2 ± 1.8 



1/2 



TNT 





641 



59.9 



105.9 ± 23.6 



1/2 



TNT 





457 



56.8 



69.2 ± 1.8 



1 



TNT 





457 



74.1 



69.2 ± 1.8 



11/2 



TNT 





457 



75.2 



69.2 ± 1.8 



11/2 



TNT 





548 



74.9 



114.8 ±29.5 



11/2 



TNT 





640 



74.4 



105.9 ± 23.6 



11/2 



TNT 





640 



76.4 



105.9 ± 23.6 



11/2 



TNT 



4-2-1955 



457 



59.5 



69.2 ± 1.8 



1/4 



C-3 





548 



90.0 



114.8 ±29.5 



14 



C-3 





640 



65.6 



105.9 ± 23.6 



1/4 



C-3 





640 



65.8 



105.9 ± 23.6 



1/4 



C-3 





457 



64.6 



69.2 ± 1.8 



V2 



C-3 





548 



84.2 



114.8 ±29.5 



1/2 



C-3 





639 



60.8 



105.9 ±23.6 



1/2 



C-3 





1097 



59.4 



94.8 ± 16.8 



1/4 



C-3 



