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Changes in geophysical technology have been rapid and dramatic in recent years so that work done only a year or two ago is referred to as the "old" geophysics. As might be expected, each new method gives rise to additional problems, often unforeseen, which limit its use and thus require a new round of improvements. Three topics are chosen to demonstrate this: (1) problems involving velocity-structure, (2) elimination of noises after stacking, and (3) direct detection of hydrocarbons. The examples are not all from the Circum-Pacific area, but the problems are general and will surely be encountered in the exploration of the Pacific province.
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