EARTHQUAKES ON THE PACIFIC COAST 117 



1887. July 6; lOli. 15m. lOs, p. m.; V. 



Recorded on seismometer at Lick Observatory. Sudden shock last- 

 ing not more than five seconds. Direction northwest and south- 

 east. Amplitude o^ of an inch. The exact time of the shock 

 was noted by Mr. J. E. Keeler. 



1887. July 8; 4 to 7:30 p. m. 



An examination of the Coast Survey tidal register for July, at 

 Saucelito, shows that at 4 o'clock p. m. on the 8th of July a 

 sharp earthquake wave entered the harbor of San Francisco. The 

 waves gradually grew smaller, and disappeared at 7.30 p. m. — 

 8. F. Bulletin. 



1887. Augrust 13; 31i. 17m. a. m.; VI. 



" A very severe shock " at Point Pinos Light Station; duration of 

 shock, eleven seconds. — Letter of Naval Secretary L. H. Board. 



1887. Ausust 13; 6:55 p. m., standard time. 



Santa Cruz Light Station. — Letter of Naval Secretary L. H. Board. 



1887. Augrust 17; 4:01 a. m.; IV. 



Slight shock at Fort Point Light Station, Presidio, San Francisco, 

 Cal.— Letter of Naval Secretary L. H. Board. 3h. 57m. a. m., lasting 

 three seconds. — S. P. Bulletin, August 18, 1887. — E. S. H. 4 a. m., 

 San Mateo (IV). 



1887. Augrust 19; 1:02 a. m. 



Berkeley, Cal. — Very distinct shock, S. E. to N. W., reported by 

 Professor Soule, University of California. 



1887. Augrust 24; III. 



San Diego felt two slight earthquakes yesterday. — S. F. Bulletin, 

 August 25, 1887. 



1887. September 9; 3:58 p. m.; I. 



Single shock in S. F., Cal. ? Somewhat doubtful.— E. S. H. 



1887. September 19; III. 



Mariposa; light earthquake accompanied by heavy rumbling noise. 

 —8. F. Bulletin, September 20th. 



1887. October 4; 



Keeler, Cal., 2 shocks, 3.45, 3.46 and 3.49, standard time. W. to E. 

 — IT. S. Signal Service Observers. 



11887. October 12: 121i. .55m. a. m.; V. 

 Recorded on seismometer at Lick Obse^vator3^ Not so heavy a 

 shock as that of July 6th, but sufficient to waken sleepers. It 

 was felt at Smith's Creek, at the foot of the mountain. Direction, 

 northwest and southeast. 

 I 



