186 EAKTHQUAKES ON THE PACIFIC COAST 



1892. April 11); Placervllle. 



A very distinct shock of earthquake was felt at 2.50 o'clock a. m. 

 to-day. The vibrations were from east to west. 



1892. April 19; UUiah. 



No seismic disturbance occurred in this section. 



1892. April 19; Bonlta Point Ligrlitliouse; 2:47 a. m. 



Sharp shock. ISIare Island L. H., 2.47 a. m., wakened sleepers (VI) ; 

 duration 30 seconds; rumbling- noise followed by a shock W. to 

 E. Fort Point L. H., 2h. 51m. 15s., lasting 7 seconds. A " miod- 

 erate " shock, though it awakened the observer. Many did not 

 feel it (V?). Roe Island L. H., Ih. 50m. a. m., railroad time 

 [should be 2.50] ; a severe shock lasting (by watch) fully 45 sec. 

 Brick chimneys thrown down; but L. H. clock not stopped, 

 though disturbed (VII?). 



East Brother L. H., 2.50 a. m., lasting 47 seconds, E. to W.; not 

 heavy. Lime Point L. H., 2.52 a. m. (clock regulated by noon 

 time-ball in S. F.) ; duration about 8 seconds. A tremor rattling 

 windows, etc. (IV?). Oakland Harbor L. H., 2.45 a. m., a strong 

 shock from the W., lasting 5 sec, " shaking dwelling terrifically, 

 etc." (VII?). Yerba Buena L. H., 2.50 a. m., lasting 58 seconds. 

 A very heavy shock. 



Angel Island L. H. Felt on the island, but not at the L. H. 



1892. April 20; Roe Island Ligbtlioase, 1:50 a. m. 



Slight shock. (The foregoing reports from lighthouse keepers are 

 kindly furnished by the U. S. Lighthouse Board, through the U. 

 S. Geological Survey.) 



1892. April 20; Vacaville. 



When the terrible shock of Tuesday morning occurred every one 

 expected a repetition. During last night there were constant 

 shocks, beginning about midnight and continuing to 8 this morn- 

 ing. The only effect of to-day's quakes has been to weaken the 

 walls already shaken. 



The tow^nspeople of Vacaville have had seven more shocks to un- 

 nerve them. The heaviest came a little before 2 o'clock this 

 morning and shook down several walls which were already tot- 

 tering, but did no other damage. No one has been hurt since 

 ^ the big shock. It is safe to say now that the danger is over, and 

 that it will take $100,000 at least to repair damages. 



1892. April 20; Petalnma. 



About 10 minutes to 2 o'clock this morning a quick, sharp shock 

 of earthquake passed through Petaluma. 



1892. April 20; Napa. 



Another shock of earthquake was felt here this morning about 

 2 o'clock. It was much lighter than that of Tuesday morning. 

 No damage was done. 



