MUSSOORIE-DEHRA DUN EPICENTRAL TRACT. j()7 



In nearly every case these fissures run parallel to the edge of the road 



cuttings in a direction approximately east and west. They, however, 



afford little evidence as to the general direction of the earthwaves. 



These vary from 6-6 to 6-15 a.m. The most 



Time records. 



reliable are : — 



(1) Clock in Postmaster's house which stopped at 6-10 a.m. 



(2) Clock in the Government Telegraph office which stopped at 



6-10 a.m. Both clocks are said to have been correct at the time. 



All accounts agree that the shock was a violent one. Several 



observers noticed three distinct shocks with intervals 



Character and _ 



direction of shock : °* between two or three seconds, the whole lasting 

 sound phenomena, from one to two minutes. One eye-witness records 

 preliminary tremors lasting 15-20 seconds. Mr. P. 

 W. Mackinnon says : — " The first shock continued for two minutes. 

 After an interval of 10 minutes another shock less severe occurred, 

 followed by several slight shocks up to 8 a.m. ; seven shocks in all . . 

 There were a great number of tremulous vibrations in the intervals 

 between shocks up to 8 a.m." 



Nearly all observers consider that the earthquake motion was from 

 south to north or vice versa. The evidence of buildings is very con- 

 tradictory, but the worst-damaged structures apparently moved in a 

 W. — E. direction. The water in tanH was observed to move both E.— W. 

 and N. — S. The direction of swing was undoubtedly largely influ- 

 enced by topographical features, ridges vibrating along a line at 

 rignt angles to their axes. The general direction of the Mussoorie 

 ridge is N. 75° W.— S. 75° E. Many people noticed moaning, rumbling 

 or rattling noises just before and accompanying the chief shock. 



Mr. Fisher, a local watchmaker, hung up a pendulum at 2 p.m. on 

 the 4th April. During the after-shocks, this pendulum swung freely. 

 Its direction of swing is N. 38° W.—S. 38° E. 



Landour. 

 The lower portion of the Landour ridge on the west is composed 

 Foundations and of a continuation of the limestone upon which 



Btmctural materials. Mu&soorie ^ built The upper part consists f 



