1921] 



Lawson: The Mobility of the Coast Ranges of Calif ornia 



467 



again in 1906p. In the interval of twenty-one years it was found, on 

 the assumption that Santa Ana had not moved, to have been displaced 

 95 meters in the direction 168°. This displacement, I take it, 

 represents strain creep unaffected by subsequent rebound. The rate 

 of strain creep is, therefore, .045 meters per year. 



Gavilan. — Gavilan is also south of the region of slip on the San 

 Andreas fault in 1906, and probably suffered no rebound in that year. 

 Its position was located in 1854 and in 1906p, but not in the interval 



Fig. 18. The path of Gavilan as determined by strain creep and the rebound 

 of 1868. 



between. Between these dates it was found to have been displaced 

 5.2 meters in the direction 309°. The path of its movements may be 

 found under the hypothesis here adopted by use of the accompanying 

 diagram. In figure 18 let A be the position in 1854 and B that in 

 1906p. Using the rate and direction of strain creep found at Toro, 

 namely .045 meters per year in the direction 168°, the station would 

 have arrived at C in 1868a, .812 meters from A in the direction 168°. 

 The sudden shift of 1868 is found, by the gradient above referi-ed to, 

 to be 7.20 meters; and this was probably in the same direction as the 

 same movement of Loma Prieta, or 320°. This would bring the station 

 in 1868p to D. From D, moving in the direction 168°, the station 

 by strain creep would have arrived in 1906 at 1.71 meters from D, 

 which checks very closely with the position at which it was actually 

 found at B, only about .1 meter away. The closeness of the check is 



