300 Chas. Davison — British Earthquakes, 1891. 



Disturhed Area. — I have received seventeen accounts of tliis 

 earthquake from sixteen different places. On the accompanying 

 map these places are represented by small discs ; a cross drawn 

 through the discs indicating that the usual earthquake-sound was 

 also heard. At one place (Otterham), so far as I know, the sound 

 only was noticed. At three other places near the boundary of the 

 disturbed area, the shock does not seem to have been felt, though 

 special inquiries were made by residents in them. These places are 

 Egloskerry, St. Kew and Trewen ; and they are represented on 

 the map by small circles. At Laneast, Port Gavern, St. Breward, 

 St. Gennys and St. Tudy, I have been informed that the shock was 

 not felt, but I am not certain that this was the experience of more 

 than one person at each of these places. 



The boundary of the disturbed area, as drawn upon the map, 

 corresponds to an isoseismal line of intensity somewhat less than IV. 

 according to the Eossi-Forel scale. The area inclosed by it is 

 17 miles long, 13 miles broad, and contains about 170 square miles. 

 Its centre is 4 miles N. 35° E. of Cainelford ; and this point probably 

 coincides very nearly with the position of the epicentrum. The 

 longer axis of the disturbed area is directed approximately north 

 and south. About one-third of the boundary-line, it will be noticed, 

 lies outside the land ; and its exact course in this part must of 

 course be somewhat uncertain. The observations fi-om Tintagel and 

 Boscastle show, however, that its position cannot differ very greatly 

 from that assigned to it on the map. 



Nature of the SJiock. — The following accounts give the most 

 detailed information I have received : 



Bolverton. — Two distinct shocks felt, separated by an interval of 

 two or three seconds. 



Boscastle. — (1) Two shocks, the first rather more intense than 

 the second which followed after a lapse of perhaps ten seconds, 

 a decided tremulous motion being felt both during and after the 

 two shocks. (2) Two shocks, the second shorter and fainter than 

 the first, and felt a second or two after it. 



Jacobstow. — Two shocks, the interval between them two or three 

 seconds. 



Michaelstow. — Two shocks felt, the first very slightly, the second 

 very decidedly, and almost instantaneously after the first. 



New Mill, Poundstock. — Two shocks, a slight tremulous motion 

 being felt before and after both of them, the first shock more intense 

 than the second. 



St. Clether. — Two shocks, consisting of a trembling like that 

 caused by a sudden violent rush of wind against the house ; each 

 shock lasted about ten seconds, they were approximately equal in 

 intensity, and were separated by an interval of a few seconds. 



St. Juliot. — Two shocks, consisting of rapid and continuous vibra- 

 tions, slightly increasing in intensity about the middle. The first 

 and strongest shock lasted for eight or nine seconds, the second for 

 five seconds, the interval between them being three seconds. 



Tintagel. — Two shocks felt. 



