b EARTHQUAKES ON THE PACIFIC COAST 



Trask (J. B.) : Earthquakes in California from 1813 to 1855 [Proceedwga of 

 the California Academy of Natural Sciences^, by Dr. John B. Trask. Vol. I 

 (1854-57). Vol. Ill (1863-67). Vol. IV, part 1. (J. B. T.) 



Trask (J. B.) : Direction and velocity of the earthquake in California of the 

 8th and 9th January, 1857. Amer. Jour. Sci., Jan. 1858, vol. 25, p. 146. 



Veatch (J. A.) : In Ifining and Scientific Press, 1868, March 31, has an article on 

 Earthquakes in San Francisco, and specially ou their direction. 



Washington (United States. Light House Board) : Annual Reports. 



: MS. Reports from lighthouse keepers, kindly communicated by the 



Secretary of the Board. 



Washington (United States Geological Survey) : MS. reports kindly communi- 

 cated by the Director of the Survey. 



Washington (United States Signal Service); Monthly Weather Review. (U. S. 

 W. R.) 



: (United States Weather Bureau) ; ibid. (U. S. W. R.) 



Whitney (J. D.): On the Earthquake of 1872, March 26. There is a resume of 

 Professor Whitney's article {^Overland Monthly, vol. 9), by Professor Rock- 

 wood, in Avier. Jour. Sci., vol. VI, 1872. 



From the above sources of information the following catalogue 

 has been derived. 



For each shock there is given, when possible, first, the year, 

 month and day; second, the hour, minute and second. The time 

 is here given exactly as it is found in the original. Usually it is 

 expressed in local civil time. In Dr. Trask's list it is intended to 

 be astronomical time (Oh. is noon, and 12h. midnight), though 

 there are probably several errors in this datum. For the later lists 

 it is usually Pacific standard (railway) time.* In Mr. Tennent's 

 observations it is San Francisco local mean time to and including 

 March 25, 1884, and after that date Pacific standard time. Pro- 

 fessor Eockwood's plan to avoid the danger of confounding A. M. 

 and P. M. dates, is to adopt the system of numbering the hours in 

 the civil day from to 24 (Oh. is midnight, 12h. is noon). I have 

 not brought the hours to a single uniform standard, in order to 

 avoid introducing mistakes in copying, and especially because very 

 few of the times are really accurate. Mr. Tennent's list is without 

 doubt quite the best in this regard. Since January 1, 1887, all the 

 stations of the Southern Pacific Eailroad, and since August, 188T, 

 those of the Atlantic and Pacific Eailway, receive a noon signal 

 (Pacific standard time) from the Lick Observatory or from the 



*i. e. Greenwich time minus 8 hours. 



