IIG EAETHQUAKES ON THE PACIFIC COAST 



injured. The railroad track of the A. T. and St. F. R, R., at 

 a point where it ran east and west, was thrown 41/3 inches out of 

 line, the convexity looking south. The bend was 300 feet long. 

 For 48 hours after the shock there were tremors. Miners 600 

 feet below the surface felt the shock severely and some became 

 sick. Miners at 150 feet noticed the shock less. The area of 

 disturbance is estimated at 1,200 by 600 miles. In Fronteras 

 Valley, Sonora, old Mexico, and the neighborhood, the shock was 

 destructive to houses and to human life. Fissures north and 

 south were produced. The center is probably south of Fronteras. 

 At San Bernardino Ranch, 90 miles southeast of Tombstone, all 

 the houses were thrown dow^n. There are extinct craters at this 

 place. 



1887. May 3; 

 Los Angeles. Tremor recorded on the magnetic instruments of the 

 U. S. Coast Survey Observatory. Dr. Schott's determination of 

 the time is 2h. 14.7m. p. m., P. s. t. (His report of June 20, 1887; 

 copy furnished by U. S. Geological Survey.) 



1887. May 4; II. 



Slight shock recorded on seismometer at Lick Observatory. 



1887. May 12; 

 Heavy shock at Petaluma. — A. S. 



1887. May 23; 



Severe shocks at Lakeport. — A. S. 



1887. June 3; 2:48 a. m. 



Carson (Nev.), S. W. and N. E. (VIII). Very severe, lasting 6 to 7 

 sec; rotary motion, preceded by a noise like thunder. Stone and 

 brick walls cracked, etc. 



1887. June 9; 9:04 p. m. 



Humboldt Light Station. Light shock. — Letter from Naval Secre- 

 tartj L. H. Board. 



1887. June 18; 1:20 a. m. 



Carson (Nev.), two light shocks. — C. W. F. 



1887. Jnne 24; 9:20 a. m.; V. 



Cape Mendocino Lighthouse. A single heavy shock, stopping the 

 clock at 9.20 a. m., and lasting two seconds. No damage was 

 done.— Letter from Naval Secretary L. H. Board. 



1887. Jnne 24; 9:20 a. m.; VI. 



Humboldt Light Station. Clock was stopped. — Mss. of L. H. Board. 



1887. Jnly 1; 

 Cape Mendocino L. H. 10.25 p. m. Light shock. — Ibid. 



