There is an error in equation (34). The equation should read:  
formula
(1)
...
There are two errors in Table 2 that should be corrected. The last equation in the right-hand column under Path attenuation, Q should read:  
formula
(2)
and the value in the right-hand column under Shear velocity, βs (km/sec) should read 3.8. The original value of 3.6 is correct, but 3.8 was inadvertently used in the calculations.
...

The results and conclusions are not affected materially by these changes.

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