3 o8 POPULAR SCIENCE MONTHLY 



1857. Sacramento to Fort Tej6n, San Bernardino and Fort Yuma. At 

 Fort Tej6n 'a fissure 20 feet wide and 40 miles long: the sides came together 

 with such violence as to make a ridge ten feet wide and several feet high.' 

 Fissures at San Bernardino. 



1865. This was a smart shock from San Francisco to San Jose\ apparently 

 along the line of the Portola fault. The severity of this earthquake, as sug- 

 gested above, may have mitigated the local severity of the earthquake of 1868, 

 which was in the same rift, but not so severe in this part of it. 



1867. This was violent disturbance about Klamath Lake. A great crack 

 said to have opened in Siskiyou County, but the locality is not recorded. 



1868. A very severe earthquake, there being a rift on the east side of the 

 bay, as also at Olema, in the Santa Cruz Mountains and for over a hundred 

 miles from Cholame through the Carisa Plain. 



1872. Owens River, Inyo County. Fissure at Big Pine 50 to 200 feet wide, 

 20 feet deep, extending 50 miles or more. Numerous shocks, very violent, 

 these preceded by weaker shocks for a year or more. 



1890. Mono Lake, similar disturbances. 



1892. Vacaville, Winters, etc., extensive local disturbances, the fissures 

 not traced, but said to have been along Bio de los Putos on the west side of 

 the valley of Solano and Yolo. 



1897. San Jacinto Valley, with a notable fissure, the details not at hand. 



To these might be added the vigorous single jolt of 1893 in the 

 San Fernando Mountains, which did little harm because occurring in 

 an uninhabited region. The writer was at Saugus at the time, and 

 noted the fall of trees and the flinging of rocks down the mountain- 

 side. There seems to have been but a single wave, which would have 

 done great injury in a populous district. It came from a short fissure 

 in Pico Canon. 



Since the earthquake of 1906 many small earthquake waves have 

 followed, evidently harmless details in the process of adjustment. 

 Looking over Holden's record, we see that many small disturbances 

 have taken place along the line of the great fault in question, besides 

 the great earthquakes of 1868 and 1906 and the lesser ones of 1800, 

 1818, 1836, 1839, 1865 and 1868. 



In 1808 there were twenty-one shocks at the Presidio of San 

 Francisco. In 1812 the shocks caused a tidal wave in the bay extend- 

 ing up to the plaza. In 1813 or 1815 ' all the buildings ' in Santa 

 Clara Valley were shaken down. There were not many and all these 

 were of adobe or sun-dried brick. In 1851, a sharp shock in San 

 Francisco. In 1852, a shock at San Francisco, with a fissure on the 

 San Bruno fault, through which Lake Merced drained into the sea. 



1853. Heavy shocks near Humboldt Bay. 



1856. Severe shocks at San Francisco, the water in the bay sank two feet. 



1863, 1864. A sharp shock at San Juan Bautista. 



1890. Sharp shock along Portola fault. The Pajaro bridge had a pier 

 shifted 18 inches, as in 1906. The same crack opened at Chittenden, and the 

 main arch in the Mission Church at San Juan Bautisia was injured. A rift 

 opened in the soil from Chittenden to San Juan as in 1906. 



