Ask a dozen different explorationists how they define "low-impact seismic" (LIS) and you'll get at least 12 different answers. This signifies the variety of methods used and experiences gained in different world regions to achieve US. However, it also is an indication of the growing importance of the US factor when planning seismic acquisition operations. Generally, we can say that US is a generic term, covering how surveys should be carried out so as to have the smallest effect on the local environment. The US issue on one crew may be able to minimize the damage when working in an area of outstanding natural beauty. In another, it's about having the ability to operate so that the crew can be in and out before the local population even knows it's there. With the growing security problems of crews from the West operating in regions where they simply aren't welcome, it is important to cope with the security side of US.
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