208 EARTHQUAKES ON THE PACIFIC COAST 



1892. August 5, G; Mount Hamilton. 



A slight shock was found registered by the duplex seismograph, 

 but felt by no one. Displacement of pen north and south, 2 mm. 

 East and west, 1 mm. 



1S92. Angrnst 8-9; Mount Hamilton. 



A slight shock was found registered by the duplex instrument, but 

 unnoticed by any one. Displacement of pen north and south, 

 1.5 mm.; east and w^est, 2.5 mm. 



1892. Angnst 18; Monnt Hamilton. 



Prof. Holden reports a shock estimated at intensity (V) of the R. 

 F. scale as occurring at 8.8.27 p. m. ± 3s. or 4s. P. S. T. 8.8.23 p. m. 

 standard Pacific time: a diffused shock extending three or four 

 seconds; fairly heavy. Time refers to about middle of shock. 

 (E. E. Barnard.) 



1892. Angrnst 24; Monnt Hamilton. 



12.22.14 P. S. T. Decided shock of one or one and one-half sec- 

 onds' duration. Examining Mars at the time. Image of the 

 planet jumped through five or six seconds. The shock consisted 

 of three or four jerks or jars. The motion seemed to be ver- 

 tical in the telescoj)e. The shock was felt outside of the tele- 

 scopic vibration. (E. E. Barnard.) 



1892. Angnst 25; Monnt Hamilton. 



The duplex seismograph shows a slight shock, the displacement 

 of the pen being 2 mm. in a north and south direction and 1.5 

 mm. in an east and west direction. 



1892. Angust 28. 



A volcanic eruption of great magnitude took place on one of the 

 Aleutian Islands, Alaska, on August 28. Black Peak, a moun- 

 tain of great height between Chignik canneries on the Aleutian 

 Islands, and Oonangashik, a station of the Alaska Commercial 

 Company, is supposed to be the volcano in action. 



A letter received from Olef M. Olson, sailing master of the schooner 

 Clara, of Sitka, formerly the Ethel, of San Diego, dated from 

 Sand Point, Alaska, September 8, gives the following points: 



" On Sunday, August 28, the eruption took place. The Clara was 

 lying at anchor in Chignik Bay abreast of the canneries, and 

 observed a beautiful cloud. It first made its appearance at 4 

 o'clock in the morning, rose straight in the air from behind the 

 mountains in the southwest until at an angle of about 35°, when 

 it lost its beautiful color, which was blue, and seemed to burst 

 lightly. It remained until after noon, when it got perfectly 

 black. The barometer was all the time steady at 30 inches. 

 About 11 o'clock the earth was shaken heavilj^ Accompanying 

 the shock were thunder and liffhtnins', which continued all that 



