232 EAETHQUAKES ON THE PACIFIC COAST 



1893. July 30; San Francisco; lb. SOm. a. ni. 



A short, sharp shock. The motion was from the southwest. 



1893. Jnly 30; Oakland; Ih. 30m. a. ni. 



Two light shocks, with scarcely a second elapsing between them. 

 No damage. 



1893. Ang-ust 6; Mount Hamilton; 91i. IGm. p. m. 



A verj^ light shock started the clock (only) of the Ewing seismo- 

 graph at 9.16 p. m. and registered on the duplex as a very sim- 

 ple tracing of only one or two vibrations nearly east and west, 

 the maximum amplitude of the tracing being 2.5 nam. It was 

 not felt by any one at the Lick Observatory. 



1893. August 9; San Francisco; Ih. ISm. a. m. 



A sharp earthquake shock. Messages from Santa Eosa and Sac- 

 ramento state that it was quite severe in those places. So far 

 as known no damage was done. Ih. 12m. a. m. Sharp shock. 

 Duration 8s.— T. T. 



1893. August 9; San Dieso. 



Two slight shocks were noticed by the local observer of the weather 

 bureau to-day, one at 11.02 a. m., the other at 4.07 p. m. 



1893. August 9; Alameda. 



Quite a sharp shock was felt at 1.15 a. m., Mr. Perrine's duplex 

 seismograph giving a tracing 5 mm. in a northwest and south- 

 east direction, and at right angles to this 1.5 mm.; also felt at 

 Berkeley. 



1893. August 9; Petaluma. 



A lively shock of earthquake was felt in this city at 1.10 this morn- 

 ing, followed for some time afterwards by tremors. In all, six 

 shocks were felt, the first being the heaviest. It w^as the most 

 severe felt here for years. The vibi*ations were north to south, 

 and lasted fifteen seconds. No damage is reported, but several 

 clocks stopped, plaster cracked, and crockery was thrown from 

 the shelves. Many people were badly frightened (VII). 



1893. August 9; Santa Rosa. 



The severest earthquake felt here since 1868 occurred this morning 

 at 1.12 o'clock. The oscillations were apparently southeast and 

 northwest. Considerable damage was done in the w^ay of fall- 

 ing chimneys, broken v^^indows, etc. The court-house \vas badly 

 shaken up, and the plastering extensively damaged (VII?, 

 VIII??). 



1893. August 9; Sonoma. 



The residents of this valley were awakened at 1 o'clock this morn- 

 ing by a heavy shock of earthquake (VI?, VII?). 1.15 a. m. at 

 Napa; 1.13 a, m. at Petaluma. 



