158 EARTHQUAKES ON THE PACIFIC COAST 



Francisco. But few rocks were scattered; the hill collaj)sed and the 

 earth in the neighborhood showed deep crevices. No disturbance 

 was observed on the San Jose seismograph, which was watched by 

 Prof. George. Nor was any record obtained at Mount Hamilton, 

 where it was looked for vsdth mercur^^ basins.^ 



1891. Feltrnary 24; Independence; 3:10 a., m. 



Reported by Mr. C. Mulholland as follows: " A strong earthquake 

 shock. The tremor was preceded an instant by a rumbling sound. 

 The motion appeared to be a little east of south to west of north. 

 The house shook so that the pans and dishes rattled. A strong 

 breeze from the south had been blowing all night, but at the 

 time of the tremor there was a brief but complete lull; then the 

 breeze set in as before." 



1891. March 7; 7:35 p. m. 



Admiralty Head L. H., Washington. A light shock. 



1891. March 7; 7:30 p. ni. 



Smith Island L. H., Washington. A slight shock. — Ms. U. S. L. H. 

 Board. 



1891. April 4; Mount Hamilton; 4:30 a. m. 



" A light, but prolonged shock from east to west," reported by Prof. 

 Holden. 



1891. April 12; Monnt Hamilton; 9:29(?)41. 



" A sudden, slight earthquake of intensity II, Rossi-Forel scale," 

 reported by Prof. Holden. 



1891. April 13; Healdsbnrg. 



A sharp shock at 11.40 j). m. 



Visalia: earthqtiake at 10.30 p. m. Vibrations from north to south. 



1891. San Francisco, May 6; 81i. 30m. p. m. 



Light shock, duration 4 sec. — T. T. 



1891, Berl£:eley, May 8; 6:10 p. m. 



Prof. Soule writes: " Very slight in San Francisco and Oakland, so 

 much so that comparatively few people noticed it. The Ewing 

 and Gray-Milne instruments, though in excellent order and very 

 sensitive, w^ere not set off. The duplex gave a small record indi- 

 cating that the direction of the shock was from northwest to 

 southeast. I should rate it as II in the Rossi-Forel scale." 



1891. San Rafael, May 8; G:08 p. m. 



A heavy shock lasting about six seconds. The vibrations were from 

 west to east. 



' Publications Astronomical Society of the Pacific, vol. Ill, page 132. 



