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



anywhere near the disturbed area. Not far distant, however, there 

 are several series of elvan dykes which have ahuost this direction. 

 The broken lines on the map represent one of these series, and if one 

 of the dykes, especially either of those which nearly coincide with 

 the southern boundary of the disturbed area, should happen to run 

 along a fault hading towards the north, it would satisfy all the 

 conditions required by the seismic evidence. 



The seismic focus must have been about 4 miles in length, and 

 the displacement throughout extremely small. That the part from 

 which the more prominent vibrations came was a narrow band is 

 evident from the small breadth of the disturbed area. The extension 

 of the sound-area on both sides of the disturbed area shows, I think, 

 that the sound-vibrations came from the lower, as well as from the 

 upper, margin of the focus ; in other words, that the displacement 

 died out downwards as well as upwards and laterally. 



Cornwall J^arthqiiake : Jan. 26, 1896. 



The earthquake was a very slight one, of intensity 3 or nearly 

 4. It was felt at 6.50 a.m. The number of records is 36 from 

 30 places, in addition to which there are negative records from 

 20 places. 



The disturbed area is 12 miles long and 8f miles broad, and 

 contains 86 square miles. The direction of the longer axis is east 

 and west, and the centre of the area lies 1^ miles S. 42° E. of 

 Launceston. 



Fig. 3.— Cornwall Earthquake : Jan. 26, 1896. 



The shock was felt at 14 places. At all of these the sound was 

 heard, as well as at 10 places where the shock was not felt, and 

 at 6 others where no mention of the shock is made. The sound-area 

 is 15 miles long and 10 miles broad, and includes 124 square miles. 

 Its longer axis is directed east and west, and is thus parallel to that 



