World-wide activity in geophysics exploration by the petroleum industry was slightly decreased in the year 1957 as compared to 1956, which was a record year. Significant gains reported in the Eastern Hemisphere were not sufficient to off-set fully the decline in activity in the Western Hemisphere. As in past years, the Committee did not receive statistical information from all countries of the world. It is known that some geophysics exploration work was done in countries from which no activity information is available. For example, according to unconfirmed reports, 320 seismic crews were in operation in Russia during 1957. Since this information could not be verified, it is not included in this report. According to reliable data received, an average of 1,122 geophysical crews of all types were employed in the search for petroleum during the year. An average of 1,136 crews were engaged in geophysics exploration in 1956, and in 1955 the average was 1,119 crews.

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