You are exactly right about eco-friendliness, especially as compared to our day of eco-trashing.

You're right that they use smaller charges but they use about the same intervals--220ft or so, IIRC. But they're using like 10# at about 50 ft. Also, the can offset a huge distance, he told me but I don't remember. When I surveyed 2-d lines 100 ft offset was a long way. This guys says they stack charges to undershoot sensitive areas and still get excellent records. I don't know enough about the seismograph end of things to understand all the stuff he was saying (talking to me like I knew a lot more than I know).

My interest in the depth and resolution of his records is in mapping the old Mississippi River distributaries. We know where they are from bore holes and such but getting seismic records from oil companies is like getting a rat from a terrier. I may get a shot at it after the client has drilled.

B