140 EARTHQUAKES ON THE PACIFIC COAST 



Mare Island Light Station: time 4.48, navy-yard time. — Was awak- 

 ened from a sound sleep. There was a rattling- of bowls and 

 pitchers. I felt two shocks: that is, one that was continuous and 

 a sudden heavier impetus in the midst of the general shaking. 

 It was sharp, severe, and quick, and more vertical than that of 

 May 19. — Kate C. McDougal, light-keeper. 



Santa Cruz Light Station. Time, 4.45 standard time. — One tremu- 

 lous shock lasting about three seconds. — Laura J. F. Hecox, light- 

 keeper. 



Fort Point Light Station. Time, 4.47. — One shock lasting about 

 twelve seconds, an undulating movement from east to west, unac- 

 companied by noise. The clock in the tower almost stopped, but 

 recovered itself. It faces south-southeast. 



Oakland: the shock appears to have been very much more severe 

 than at the Lick Observatory. The magnified record at the Cha- 

 bot Observatory shows irregular vibrations distributed in all 

 azimuths over a circle about 8 millimeters In diameter, with 

 irregular loops running out about 18 millimeters from the center. 

 These may be due to swinging- of the pendulum. Time, 4.45.30. 

 Duration, twenty seconds. The pier of the 8-inch equatorial tele- 

 scope w^as cracked near the top, where it was 40 by 15 inches in 

 cross-section, and the south side was shifted one-sixteenth inch 

 toward the east, the north side remaining in position. The pier 

 is of brick. The ferry clock at the foot of Market Street, San 

 Francisco, stopped at 4.47.20. (Error ± 3 seconds). The clock in 

 the ferry-house at Oakland pier stopped 4.46.30; error unknown. — 

 C. Burckhalter. (VI.) 



Oakland: the first shock seemed to be from northeast to south- 

 west, and was attended by three distinct, loiTd, sharp reports, 

 followed by a rattling noise which gradually died away. No 

 vibration of pendant objects, but rattling of windows for a longer 

 time than I had ever before noticed. — J. B. Trembley. 



East Oakland: at Mr. Blinn's observatory the record showed an 

 indistinguishable naass of lines about 4 millimeters in diameter, 

 with many loops roughly distributed over a circle about 18 milli- 

 meters in diameter, and finally a number of great loops extend- 

 ing as much as 35 millimeters from the center. The last are 

 certainly due to swinging of the pendulum. Thej' extended 

 mostly in an east and west direction. Fully (VI). — F. G. B. 

 Time about 4.47. A fresh plate was substituted immediately after 

 the heavy shock, but the two subsequent lighfer shocks made no 

 record, and I did not feel them. They are described as being 

 vertical and momentary. — F. G. Blinn. The first shock awakened 

 me at 4.46.34, which must have been very nearly the time of be- 

 ginning of the earthquake. Time of ending noted by Mr. A. S. 

 Ireland at 4.46.45. The second shock occurred at 4.54.59, and was 



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