E. S. Holden — Earthquakes in California. 395 



February 18, 2:50 a. m. — Fort Bragg : three severe shocks, 

 (V?) ; the first at 2:50, the other at intervals of one or two 

 minutes. Mendocino : three shocks ; the first at 2:55, the 

 others at intervals of three or four minutes. — (S. F. Bulletin, 

 February 18.) 



February ? about 4 A. M. — Menlo Park : sleepers waked (Y 

 or YI).— J. T. Doyle, Esq. 



February 29, 2:51 P. m. — S. F.: on Montgomery street, peo- 

 ple alarmed (Y) ; Pine and Mason streets, more severe, (YI) ; 

 "Washington and Mason streets, (YI). Two waves on duplex 

 seismometer (917 Pine street.). The motion of the earth was 



a—N. 68° W. to S. 68° E. b— S. 56° E. to K 56° W. 

 The shock b was most severe. 



Berkeley : not felt, not registered. — Oakland : (II.) — Bel- 

 mont : not felt.— San Eafael : (IY or Y) 2:48 p. m., E. to W.— 

 Santa Rosa : 2:55 p. m., violent ; people ran out of houses, 

 (YI). — Petaluma : 2:55 p. M., walls cracked (YII) sound of an 

 explosion heard. The severest for many years. — Healdsburg : 

 2:44 p. M., light K to S. — Martinez : 2:45 P. M., two shocks one 

 minute apart (YI). — S. F. Alta, Chronicle, Bulletin, Feb. 

 29th and Mar. 1. 



March 7, 7:54 a. m. — Pasadena : 7:58 a. m., (YI) ; from 

 ~N.~W. to S.E., duration three seconds. — Los Angeles : a little 

 after 8 A. M. (YI)? "severest for 18 years; no damage to 

 buildings," no very heavy articles overturned (YI). [Note : 

 on 1883, Sept. 5th, a shock (YI) was felt at Los Angeles, 

 E. S. H.J — San Diego : scarcely felt (II). (Pasadena Daily 

 Star • also S. F. Alta, Chronicle, Mar. 7, 8). 



March 28, 1:41 a. m. — S. F.: slight shock, but sufficient to 

 awaken a sleeper (Y). Direction of shock nearly K and S., 

 on duplex seismometei', 917 Pine street. Professor Davidson 

 says duration f second, and shock from W. to E. — S. F. 

 Bulletin, Mar. 29. 



April 9, 7:50 a. m. — Eiverside : slight shock (IY) KB. and 

 S.W. (S. F. Bulletin, April 9, Chronicle, April 10.) 



April 12, about 5:15 a. m. — Riverside : the shock sufficient 

 to waken sleepers (YI) with loud noises accompanying. Col- 

 ton, 5:30 a. M. (S. F. Chronicle, April 13.) 



April 28, [8:45 P. m.] — On the Lick Observatory seismo- 

 graph an earthquake record was found April 29. From the 

 trace of this shock the following data are taken. The dimen- 

 sions given below are to be divided by 3'3 for the Horizontal 

 and by l - 6 for the Yertical components, to get the actual earth 

 movements. The times are given in seconds after a zero 

 epoch arbitrarily assumed. The pen which marks the W. and 

 E. components registered a line T 4 ¥ of a millimeter wide 

 throughout. There appear to be widenings of this line as 



