48 EARTHQUAKES ON THE PACIFIC COAST 



1856. Decemljep ?; about lO p. m. 



Foot of Clear Lake, Lake County, Cal. — B. Ms. — S. F. Bulletin, Sep- 

 tember 3, 1859. This shock was not felt at Big Valley, thirteen 

 miles away. — B. Ms. 



1856? December?; VII. 



Very severe in San Diego, Cal. — Verbal account of Don Jose 

 Thompson. 



1856. In the fall; IX. 



Tulare County. The line of the shock " was marked by a fracture 

 of the earth's surface, continuing in one uniform direction for a 

 distance of some two hundred miles." — B. Ms. — Barton, History of 

 Tulare County, p. 11. 



1857. January 8; 11:30 p. m.; also January 9; VIII? IX? 



Heavy earthquakes in California. All the houses in Santa Barbara 

 were damaged. — Perrey. 



At Ft. Tejon this shock was more severe than the shocks of 1812. — 

 B. Ms.— Nevada Journal, May 8, 1857. Two persons killed by being 

 buried in the ruins of a house.— B. Ms. — Los Angeles Express, De- 

 cember 4, 1875? [1857?]. Visalia, Tulare County, it was difficult to 

 stand erect; tree tops waved several feet to and fro; it was equally 

 severe at places within fifty miles north and south. 



1857. January 8; 6 a. m., 9 a. m., 10 a. ni. 



Three shocks at Santa Barbara; and in the afternoon two slight 

 shocks and one severe one; 8.30 a. m., Los Angeles; 8.15 a. m., San 

 Francisco; 7 a. m., Monterey; 7.30 a. m., Sacramento. — Perrey. 

 San Francisco, 8 a. m. — T. T. At Los Angeles, five or six shocks 

 during the day, and within eight days about twenty shocks. — 

 B. Ms. — Sacramento Union, February 5, 1857. 



1857. January 8 and 9; 



California. Dr. Trask shows that the velocity of the earth wave 

 was: San Francisco-Sacramento, 6.6 miles per minute; San Fran- 

 cisco-Stockton, 6.5 miles per minute; San Francisco-Tejon, 6.0 

 miles per minute; San Francisco-San Diego, 7.0 miles per minute. 

 Or, on the average, 6.2 miles per minute, or 545.6 feet per second. 

 —Amer. Jour. Sci., vol. 25, p. 146. 



1857. January 9; 8:20 a. m. 



At Stockton, and Benson's Ferry on the Mokelumne, several shocks 

 on the night 8-9, the principal one at 8.15 a. m.; 8.30 a. m., very 

 severe at Sacramento; 7 a. m., at Los Angeles and Monterey. — • 

 S. F. Bulletin^ January 9, 1857. San Jose, Cal. — Sacramento Onion, 

 September 20, 1858. 



1857. January 9; 



Ft. Tejon, the earth opened in cracks twenty miles long; buildings 

 and chimneys were thrown down; beds of streams changed. — B. 

 Ms. — Los Angeles County History, p. 545. 



