THE 



QUARTERLY JOURNAL 



or 



THE GEOLOGICAL SOCIETY OF LONDON. 



Vol. LVI. 



1. On the Cornish Earthquakes of March 29th to April 2nd, 1898, 

 By Charles Davison, Sc.D., F.G.S. (Read November 8th y 

 1899.) 



[Map on p. 2.] 



On March 29th and April 1st & 2nd, 1898, three slight earthquake- 

 shocks were felt in the south of Cornwall. Their importance lies 

 chiefly in the unusually clear evidence which they furnish, with 

 regard to the origin of the double series of vibrations in one of the 

 shocks, and to the continuous displacement of the seismic focus along 

 the surface of the originating fault. 



It is possible that, at about the same time, there may have been 

 other shocks or earth-sounds ; but none, so far as I am aware, was 

 noticed by more than one person. At Constantine, which is about 

 2 miles from the centre of the area chiefly affected, subterranean 

 rumblings were heard on twelve occasions, ranging from six days 

 before to three days after the principal earthquake on April 1st. 

 Two other slight shocks, accompanied by a faint rumbling sound, 

 were also observed on April 10th — one at Helston at 1.45 p.m., the 

 other at Mabe at about 4.30 p.m. I have tried in vain to obtain other 

 records of these reported shocks, and their seismic origin cannot, 

 therefore, be regarded as established. 



Earthquake of March 29th, about 10.25 p.m. 



Of this earthquake I have only 9 accounts from 7 different places, 

 namely, Crowan, Garras, Helston, Mabe, Mawnan Smith, Nance- 

 Q. J. G. S. No. 221. B 



