Several networks of closely spaced points have been established along the Hayward fault for the purpose of monitoring slippage. The results of 1951, 1957 and 1963 surveys of a larger network covering the San Francisco Bay Area are shown graphically. Shear data as calculated from the 1951 and 1957 surveys are tabulated for each triangle of the net. The results obtained from the survey data indicate a larger movement during the 1951–1957 period.

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