EARTHQUAKES 0^■ THE PACIFIC COAST 49 



tween 1 and 8 p. m. Five shocks between 3 p. in.. April 18. ami 

 6 a. m., April 19. 



Niles; 5:15 a. m. — Wm. Barry. 



Lick Observatory; 5:12:45 a. m. Duration of record on the Ewiug 

 seismograph 3 minutes 45 seconds. A large number of reports 

 are to be found in the observatory record. 



"Duration of (the 5:12) shock about 30 seconds; vibrations stopped 

 in house at end of that time. Heaviest shock 11 seconds after start, 

 shocks coming about one a second. Heaviest E.-F. VIII; north- 

 vi^est to southeast. First secondary maximum about 5 seconds after 

 beginning — maximum 11 seconds after beginning. Another sec- 

 ondary maximum about 15 or 20 seconds from beginning, accom- 

 panied by sound as of flight of birds; no rumbling; no vertical 

 component. (Other shocks during same day:) (5:46:34 a. m. R.-F. 

 II. 9:16:52 a. m. R.-F. III. 11:53:37 a. m. R.-F. Ill, vertical. 

 6:51:58 p. m. R.-F. II, vertical. "-^K. Burns. 



"Time of heaviest shock 5:12:45 a. m. Eight slight shocks felt 

 in the half hour following. Also one at 6:30 a. m., 6:45 a. m., 

 8:15 a. m., 9:30 a. m., and one other between 6:45 and 8:15 a. ni. " — 

 R. G. Aitken. 



"Time 5:12:19 a. ni. At first a jar, then a perceptible pause, then 

 a tremble. Oounted up to 25 seconds positively, then continued 

 mechanically. I would put the time of duration between 30 and 

 35 seconds. Heard no sound preceding the shake. Other shocks 

 same day 8:14:39, 9:16:52, 11:53:34 a. m., 2:28:36 j.. in. "—Miss 

 A. M. Hobe. 



"At the first shock awake and began to count seconds. Took watch 

 from under pillow counted 10 or 12 seconds when the very heavy 

 shock came and plaster dust began to rain down on the bed. 

 * * * Standing in the doorway and looking out of the east 

 window could see the walls of the brick house shaking * * * " — 

 H. K. Palmer. 



"Clock in director's office stopped at 5:12:52 a. ni. This clock has 

 a very small and steady rate, was noted as correct within a half 

 minute April 15. Conclusion; violent part of earthquake was 

 between 5:12:22 and 5:13:22."— J. D. Maddrill. 



C A. Vogt states beginning of shock 5:11:50. 



"Time of beginning 5:12:13. Counted for one minute before getting 

 time from watch; heavy vibration still felt at that time. 60 

 seconds after first count. Motion was felt for nearly a minute 

 longer, or nearly two minutes after first count. The motion was 

 almost entirely horizontal, no vertical movement of consequence 

 was noticed. The waves were very long but smooth. The heaviest 

 seemed to be nearly east and west. Intensity on the R.-F. 

 scale VIII or IX. Water in Smith creek 12 noon was densely 

 milky, light slate color, not yellowish as after heavy freshet." — 

 C. D. Perrine. 



Ewing seismograph north-south pen left plate about one-quarter 

 minute after beginning and returned about one-half revolution 



4 



