Abstract

Geophysical activity during 1952 reached a new all-time high: On the basis of incomplete reports, the full time services of 948 crews were utilized the world over last year, an increase of 157 crews over 1951. The 9,801 crew-months of seismograph work in the U. S. and Canada alone exceeded the 9,549 crew-month world total of such work in 1951. There was a slight decrease in gravity operations from 1,526 crew-months in 1951 to 1,502 crew-months in 1952. The reports received on magnetometer activity seem to be neither complete nor reliable, and no attempt to estimate a trend seems justified.

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