THE ISOSEISTS. 3^ 



form. The very large amplitude of 9 I inches testifies to a highly 

 destructive slow moving wave similar to that which must have obtained 

 at Dharmsala, and having as its physical reason the loosely aggregated 

 sub -recent gravels, sands and clays and their numerous steep and high 

 free edges at the river gorges. The acceleration of 13 feet per second 

 per second is equal to 3,900 mm., which according to Omori is above 

 scale X, coming near his own number 6. The overturned objects at 

 Kangra yielded a more or less definite direction of overthrow within a 

 limited area, namely, between N.45°E. and N.93°E. 



At ClachnacucTdin Tea Estate three shocks are reported, the second 

 longer and more violent than the first and from 

 bourhood. N.E. or E., whilst the third is described as a sudden 



jerk from N.E. and back again. We have also data 

 from the projection of the crosses from the gable-ends of the Palampur 

 Church to distances of 21 feet 10 inches and 24 feet 3 inches from 

 vertical heights of 37 and 46 feet respectively, which testify to the high 

 swing acquired by the building during the shock. 



In the two cases v^^/ 206 feet and y ' 204 feet per second, respective- 

 ly, *. e., about 14 feet per second, as the greatly magnified horizontal 

 velocity with which they were jerked off their high positions. 



Isoseist No. IX. 

 (1) Description and general intensity. 



This isoseismal line is not so well delineated as either VIII or X. It 

 D , . would indeed be sufficient if it were regarded merely 



Boundaries less ° J 



well defined than as an interpolation between VIII and X. Still 



VIII or X. ^ l ,i.',i i 



it encloses an area m the greatly disturbed tract that 

 has many characteristics of its own. An attempt will now be made to 

 summarise these. In extent it embraces an area of about 1,600 square 

 miles, surrounding No, X in a rough ellipse. The greater part of this 

 area lies to the east- south-east of the X area with only a comparatively 

 narrow band continuing round its north-west part. On the west and south 

 this isoseismal can be located with considerable accuracy as it cuts 



