22 SOUTHERN CALIFORNIA GEOLOGY 



September, 1916, by Dr. H. 0. Wood, who has con- 

 scientiously endeavored to give all data concerning 

 selected earthquakes and endeavored to correlate them 

 with the faults associated with the disturbance. 



To read his list, which extends from 1769 to 1920, 

 we at first are rather appalled by the number and wide 

 distribution of the quakes recorded. Likewise the 

 comments and notations might not be pleasant reading 

 to the timid minded. 



Let me quote the words of Sidney 0. Townley:^ "In 

 1812 the southern part of the state was shaken by a 

 large number of earthquakes — great damage was done 

 to the missions. For over forty years after this, until 

 1857, there was not another severe earthquake." On 

 October 25th, 1893, San Jacinto was damaged by 

 earthquakes. "The shocks of 1812, 1868, 1872, and 

 1906 were most destructive, but we might add that the 

 total loss of life has been insignificant." 



There have been several relatively severe tension 

 relieving quakes in Southern California since 1906. 

 These were principally along the San Jacinto branch of 

 the San Andreas rift line, at San Jacinto, at El Centro, 

 Mexicali and elsewhere. One series of shocks also 

 occurred at Inglewood and several small ones in Los 

 Angeles. 



There has also been a severe and property-damag- 

 ing shock at Santa Barbara in 1924, but this occurred 

 near the Santa Ynez fault line of the Transverse 

 or East-West System, and did not affect Southern 

 California and the Los Angeles region in gen'^ral. 



There is much evidence to show that the severities 

 of the tremors of 1769, 1812, 1857 in Southern Cali- 



'Bulletin of the Seismological Society of America 1919. 



