■ 

 330 MIDDLEMISS : KANGRA EARTHQUAKE. 



With regard to (2), it should be remarked that in travelling from 

 Nurpur to Kangra, and from Haripur or Dera-Gopipur to Kangra, we 

 c:ross in each instance through the grades of intensities from such as 

 are marked by trivial cracks in the plaster and corners of walls to those 

 of complete destruction to buildings, and all within the short radial 

 distance of 8 or 9 miles. In other words, the surface intensity increases 

 extremely rapidly in these directions and indicates a proportionately 

 shallow depth for the position of the centrum in the vicinity. 



With regard to (3) — which briefly expresses the fact that in travel- 

 ling from the Kangra neighbourhood across the same isoseismals but in 

 an east- south-east direction we must cover about 100 miles of conti- 

 nuous and slightly diminishing intensity — an exactly opposite conclu- 

 sion is .indicated, namely, the increasing depth of the centrum in that 

 direction* 



With regard to (4), the conditions imply a smaller separate centrum 

 following an axis parallel to that of the Kangra-Kulu area, once more 

 rather nearer the surface, and of an actual intensity at the focus much 

 less than that at the Kangra-Kulu centrum. 



For the present we must be content to regard these two axial lines 

 lying within p'anes (probably of faulting), as being the main and sub- 

 sidiary loci either of one universal and contemporaneous shock, or of 

 two, or even a series, of separate but almost instantaneous shocks, 

 following one another sympathetically along lines of great tension. 



To calculate approximately the depth of the focus, the method 

 Df-pth of centrum: adopted by Major C. E. Button 1 recommends itself 



approximate quanti- , , ,, , , "*. 



tative determina- ^ere b ? lts reasonableness and general apph- 



tion: Dutton's me- cability 

 thod. 



On the assumption of a uniform medium, and that the intensity 

 varied inversely as the square of the distance from the origin, Dutton 

 shows that ihe variation of surface intensity along a horizontal line 



1 " EarthquakevS in the light of the New Seismology," Chap. IX (1904). 



