Dr. C. Davison — British Eaitliquakcs. 



53- 



It is 34 miles long, 22J miles wide, and about 600 square miles 

 in area. Its centre lies 15 miles south-west of Hessle, the longer 

 axis being directed from E. 25° N. to W. 25° S. Outside the 

 isoseismal 4, a tremulous motion was also felt under favourable 

 conditions at Clarborough (3^ miles to the south), Hull, Beverley, 

 and Beeford (2^, 7, and 17 miles to the north-east), and Leeds, 

 Horsforth, and Kawdon (24, 28, and 30 miles to the north-west). 

 The sound was also heard at Clarborougli, Hull, and Horsforth. 



The shock consisted of a single series of vibrations, increasing 

 in intensity to a maximum and then dying away. The average 

 duration of the shock was about 4 seconds. 



Sntitt-^'b^ 



Fig. 1. — Diagram Map of the Hessle Earthquake : April 13, 1902. 



The sound was heard by 96 per cent, of the observers ; and was 

 compared in 48 per cent, of the records to passing vehicles of various 

 kinds, in 38 per cent, to thunder, and in 14 per cent, to wind. The 

 beginning of the sound preceded that of the shock in 42 per cent, 

 of the records, coincided with it in 50, and followed it in 8 per 

 cent. ; the end of the sound preceded that of the shock in 10 per cent., 

 coincided with it in 50, and followed it in 40 per cent. 



With regard to the origin of the earthquake, I can offer na 

 suggestion, except that the direction of the originating fault was 

 probably about E.N.E. and W.S.W. On the Geological Survey 

 map of the district (Sheet 86) only one fault is marked, and this 

 is 4 or 5 miles from the epicentre and inclined to the longer axis 

 of the disturbed area. 



Stkontian Earthquake : Oct. 14, 1902. 



Time of occurrence, about 5.15 p.m. ; intensity, 5 ; centre of 

 isoseismal 5 in lat. 56° 44-4' N., long. 5° 30-5' W. ; number of 

 records, 47, from 38 places, and 38 negative records from 33 

 places. (Fig. 2.) 



