. Bulletin of the Department of Geology. Geology. 448 University of California Puhlications in Geology [Vol. 12 the direction 183°, and is certain. If, as Hayford and Baldwin^" are inclined to think, "Sonoma Mountain did not moVe much, if any," in 1906, then |- meters is the measure of the strain creep in fifty years, and the rate of strain creep is .025-)- meters per year. In the absence of any determination of position between 1856 and 1906p Sonoma Mountain is of interest chiefly in establishing the fact that, if there were no sudden movement in 1906, then the direction o
. Bulletin of the Department of Geology. Geology. 448 University of California Puhlications in Geology [Vol. 12 the direction 183°, and is certain. If, as Hayford and Baldwin^" are inclined to think, "Sonoma Mountain did not moVe much, if any," in 1906, then |- meters is the measure of the strain creep in fifty years, and the rate of strain creep is .025-)- meters per year. In the absence of any determination of position between 1856 and 1906p Sonoma Mountain is of interest chiefly in establishing the fact that, if there were no sudden movement in 1906, then the direction of strain creep was 183° ; and if a slight displacement did occur in 1906 the direction of strain creep was somewhat more westerly than 183°.. Fig. 6 ' Fig. 7 Fig. 6. Chaparral moved meters from A to D between 1856 and 1906 by strain creep, and meters from D to C in 1906 by rebound. Fig. 7. Farallon moved meters from A to D between 1860 and 1906 by strain creej), and meters from D to C in 1906 by rebound. Farallon.—Farallon Lighthouse is another important geodetic station which was located by the surveys I, II, and III. It lies 37 kilometers to the southwest of the San Andreas fault in a direction normal to its strike, and is the only station on the w'est side of the fault for which we have measurements of displacements for all three surveys. Fortunately these measurements are of a high order of certainty. The displacements, whether those of slow strain creep or of rebound, are remarkable for their large westerly component. The positions of the station in the years 1860, 1891, and 1906p are indicated by A, B, and C respectively in figure 7. The point moved meters in the direction 153° between the years 1860 and 1891. The direction of the strain creep here is 20° more W'esterly than it is in the vicinity of the San Andreas fault; but at a distance of 37 kilometers the 10 Op. cit., p. Please note that these images are extracted from scanned pa
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