GENERALIZATION'S CONCERNINC; EARTHQUAKES 35 



have ever been killed in our history from collapses of 

 buildings during earthquake shocks. 



Several times the atmospheric vibrations from the 

 firing of big guns of the navy at target practice off 

 San Pedro have caused more damage in the shape of 

 window-breaking and chimney-shaking than all of the 

 earthquakes of Southern California have ever done. 



From the admittedly imperfect statistics gathered 

 by Wood and others and published in the Bulletins of 

 the Seismological Society, we gather that about 170 

 shocks have been recorded within historic times (since 

 1780) in Southern California, none of which have been 

 productive of human fatalities or serious property in- 

 juries within the city of Los Angeles, or extensive sim- 

 ilar damages elsewhere in Southern California. 



From a study of these statistics I temporarily infer 

 that these may have been accredited to the various 

 fault lines as follows: 



San Jacinto Rift, 92 ; San Andreas Rift, 16 ; Elsinore 

 Rift, including the lines past Pomona, Corona, Muri- 

 etta, Elsinore, Pala, near Julian, etc., 16; Inglewood, 

 14; Los Angeles City, 2, and some 30 uncorrected 

 shocks from distant localities. 



Likewise, many of the shocks which take place along 

 the San Jacinto and Santa Ynez lines are felt with 

 greatly reduced intensity in Los Angeles, which is 

 some seventy miles distant, and are often accredited 

 to local movements within that city. 



Many of the small shocks felt at Los Angeles are 

 vibrations from distant epicenters. For instance, at 

 5:49 and 5:52 A.M., on the morning of November 4, 

 1927, the day when this was being written, the writer 



