4-i EAKTHQUAKES ON THE PACIFIC COAST 



1554. December 23; 



Violent shock occurred in Japan. In the harbor of Simoda the 

 water was agitated so that its depth varied between 8 and 40 feet. 

 The waves were transmitted across the Pacific and registered on 

 the tide g-auges of the United States Coast Survey at San Fran- 

 cisco, Astoria, and San Diego. The velocity of the sea wave was: 

 Simoda to San Francisco, 368 miles per hour, 5.966 miles per min- 

 ute; Simoda to San Diego, 355 miles per hour. — A. D. Bache, in 

 Am. Jour. Sci. — Perrey. 



1555. January '2; just liefore lO a. m.; III. 



Two slight vibrations five seconds apart. San Francisco, Cal. — B. 

 Ms. — San Francisco Golden Era, January 6, 1855. 



1855, January 13; ISli. 30m.; V. 



Smart shock at San Benito and San Miguel, Cal. It was also felt at 

 San Luis Obispo. — J. B. T. 



1855. January 14; lO p. ni.; V. 



Along ninety-four miles of the coast of California. — Perrey. 



1855. January 24; 331i. 



A heavy shock, lasting seven seconds, was felt at Downieville, Sierra 

 County, Cal. This shock was quite severe at Gibsonville on the 

 north, at Forest City and Minnesota, in Sierra County; and at 

 Orleans Flat and Eureka, Humboldt County; in Nevada County; 

 at Georgetown and Nashville in El Dorado County on the south; 

 and at Keystone Kanch, in Yuba County, on the west. — J. B. T. 



1855. February 5; 10 a. ni.; III. 



A light shock at Wolf Creek, and the northeast part of Nevada 

 County, Cal.— J. B. T. 



1855. April 7; 6 p. m.; III. 



A light shock at Gibbs Ferry, Trinity County, and as far north as ; 

 Calahan's Eanch, at the head of Scott's Valley, Siskiyou County. — 

 J. B. T. 



1855. June 9; 5 a. ni.; III. 



Fort Yuma; slight shock. Report of explorations for railroad near 

 the 32d parallel, Appendix I, p. 9, vol. VII. 



1855. June 35; 14h.; V. 



Smart shock at Santa Barbara, and north to the Valley of Santa 

 ISIaria.— J. B. T. 



1855. July 10; Oh. 30m.; III. 



A light shock at Georgetown, El Dorado County, Cal. — J. B. T. 



