168 Dr. C. Davison— British Earthquakes, 1893-99. 



Also at Castleo'er, 6 miles to the nortb-east, the sound was heard by 

 two persons, and a faint tremor was felt by one of them. Probably 

 all of these observations refer to the earthquake. 



The shock lasted about 3 seconds, and was a mere quiver of 

 intensity 4 at places close to the boundary above mentioned, Avhich 

 may therefore be regarded as an isoseismal of that intensity. Six 

 observers compare the sound to some well-known type — three 

 to distant thunder and three to the rumble of a passing cart or 

 waggon. 



On the Geological Survey map of the district, there is no fault 

 marked anywhere near the required position. If the earthquake 

 were due to a fault-slip, the approximate circularity of the disturbed 

 area and the short duration of the shock show that the length of the 

 seismic focus was small. 



Glen Nevis Earthquake : June 5, 1896. 



A slight shock was felt at an early hour in the morning, being 

 strongest at Achreach. No mention is made of any sound accom- 

 panying the shock, but the account is very brief (North British 

 Daily Mail, Glasgow, June 6). One of the seismographs at the 

 Low-level Observatory at Fort William is said to have shown 

 a very doubtful indication of the shock. The earthquake may have 

 been due to a slip of the Highland fault, but there is no proof 

 whatever of such an origin. If there were, it would of course 

 furnish another indication that the hade of the fault in this district 

 is to the south-east. 



Butland Earthquake : Jan. 28, 1898. 



A slight shock of intensity 3 was felt about 10.5 p.m. over 

 nearly the whole of Eutland and in small portions of the adjoining 

 counties of Lincoln, Leicester, and Northampton. I have received 

 40 records of the earthquake from 26 places. For more than 

 half of these accounts I am indebted to Mr. F. Coventry, of 

 Duddington, who very kindly made many inquiries and distributed 

 a number of my forms in different parts of the disturbed area. 



In the map of the earthquake (Fig. 4), the boundary of the 

 disturbed area is represented by a continuous line and that of 

 the sound-area by a dotted line. Of the two the latter is probably 

 the more accurately drawn, but it is impossible to feel much 

 confidence in either, on account of the small number of determining 

 places and the want of negative records. I made many inquiries, 

 however, in the surrounding district, and the absence of replies is 

 probably equivalent to non-observance of the shock or sound. 



The disturbed area, as mapped, is 15 miles long, 12| miles broad, 

 and contains 142 square miles. Its longer axis is directed N. 27° W. 

 and S. 27° E. The sound-area overlaps the disturbed area by about 

 a mile towards the south and three-quarters of a mile towards the 

 east; its linear dimensions being 16 miles and 13|- miles, and its 

 area 165 square miles. The centre of the disturbed area is If miles 

 E.N.E. of Oakham and coincides nearly with the village of Burley. 



