﻿THE 



QUARTERLY JOURNAL 



ov 



THE GEOLOGICAL SOCIETY OF LONDON. 

 Vol. LXI. 



;1. The Leicester Earthquakes of August 4th, 1893, and 

 June 21st, 1904. By Chirles Davison, Sc.D., P.G.S. 

 (Read December 21st, 1904.) 



[Plate I— Map.] 



I. Introduction. 



Though an interval of nearly eleven years separated the Leicester 

 earthquakes of August 4th, 1893, and June 21st, 1904, the two 

 shocks were so closely related in their origin that it is convenient 

 to regard them as members of a single series. The earthquake of 

 1893 is the subject of a former paper, 1 but the more recent inves- 

 tigation of twin-earthquakes has rendered that account incomplete. 

 I have therefore re-examined the evidence, and, in the earlier part 

 of the present paper, have briefly described the phenomena, in so 

 far as the twin character of the earthquake and its connection 

 with the earthquake of 1904 are concerned. 



II. Earthquake oe August 4th, 1893. 



Time of occurrence, 6.41 r.M. ; intensity, 5 ; centre of isoseisinal 5, in 

 lat. 52° 44-6' N., long. 1° 13-8' W. Number of records, 391, from 298 places, 

 and 103 negative records from 97 places (PL I). 



The curves on the map (PI. I) represent isoseismal lines of in- 

 tensities 5, 4, and 3. Of these, the first is 18 miles long, 11| miles 



1 ' On the Leicester Earthquake of August 4th, 1893 ' Proc. Boy. Soc. 

 vol. lvii (1895) pp. 87-95. In redrawing the isoseismal lines, some slight 

 changes have been made. The expenses of both investigations were defrayed 

 from grants received from the Government Research-Fund. 



Q.J.G.S. No. 241. b 



