EARTHQUAKES ON THE PACIFIC COAST 135 



Santa Rosa: three distinct shocks of earthquake in close succes- 

 sion, were felt at 3 o'clock this morning-. The vibrations were 

 from east to west. 



lone: many citizens were aroused at 3.10 this inorning by an earth- 

 quake shock, lasting several seconds. The vibrations were north 

 and south (VI). 



Siiisun: at 3.10 thib morning- a severe shock of earthquake was felt 

 here, accompanied by a rumbling- noise. 



1880. May 26; 7:13 a. m. 



Central California. — Lick Observatory: a very slight shock was 

 recorded by the seismographs at 7.12±1. The extreme motion of 

 the earth's surface did not exceed 0.5 mm. The greatest dis- 

 turbance was in a north and south direction, and the vertical 

 component was very small. Although this shock was recorded 

 on both instruments, it was not felt by any one on the mountain. 



Period ^ two seconds, hence computed intensity = 2.5 or (I). 



San Jose and vicinity: not felt. 



San Francisco: 7h. 14m. a. m. Light shock, duration 1 sec. — T. T. 

 A slight shock of earthquake was felt In this city on Sunday 

 morning at thirteen minutes six seconds after 7. The vibrations 

 lasted but two or three seconds and were east and west. (Time 

 noted by Professor Davidson.) 



Gonzales: a heavy shock of earthquake was felt here this morning 

 at 7.15. The tremor lasted half a minute and made the large 

 buildings quiver. The oscillation was from northeast to south- 

 west. 



Santa Cruz: quite a shock of earthquake occurred at 7.15 this morn- 

 ing, the wave being west to east. No damage was done, the shock 

 being much lighter than the one a week ago. 



18S9. June 2; 5:54 p. m. 



Humboldt Light Station: it lasted about seven seconds. No pre- 

 vious noises; but with the quake came a noise of rushing wind 

 or sudden gust. I would class the quake as light. It rattled 

 crockery, but did not thro-w anything off shelves. It indicated 

 itself in an undulatory motion from west-southwest to east- 

 northeast as marked by a wicker basket suspended from the ceil- 

 ing which swung 15 degrees. The pendulum clock in light tower 

 (pendulum 20 inches long) stopped at 5.54 p. m. sun time by 

 almanac; the clock faces to west. — William C. Price, light-keeper. 



1889. June 6; 4 a. m. 



Oakland: a sudden shock lasting one second, followed by a rumbling 

 noise lasting five or six seconds (II). — F. G. Blinn. A slight trace 

 was made by the seismograph. Mount Hamilton — not felt or 

 not recorded. 



