MUSSOORIE-DEHRA DUN EPICENTRAL TRACT. 39 



direction show cracks hading from 0° — 20° in opposite directions. 

 Wing walls running S. 52° E. have separated from the principal 

 structure. The kitchen is a detached circular building. The most 

 pronounced crack runs through it on a N. 15° W. course. Walls of 

 outbuildings aligned N. 60° W. fell to S. 30° W. In the godowns the 

 principal damage is to walls facing S. W., the cracks hading from 

 0°— 10° to K W. 



I11 a mud-built shed walls running N. 55° W. display cracks hading 

 N. W. at 15° and 17°, another fracture hading S. E. at 5°. The cross- 

 wall fractures hade S. 35° W T . at 25°. 



In this collection of buildings the principal direction of motion was 

 apparently N. E. — S. W., but there is considerable evidence of motion 

 in other directions. 



Estimates of the duration of the chief shock vary irom 2 seconds 

 Duration and cha- to as many minutes. The general opinion was 

 racier of principal fl^ [ t l as ted from forty-five to sixty seconds. 



shock, and direction 

 of impulse, etc. 



The quake appears to have begun with mild vibrations which 

 lasted long enough for those who were awake at the time to reach the 

 door. The violent oscillations were two or three in number, dying 

 away in the same manner as the disturbance began. Colonel Burrard 

 considered that the vibrations were horizontal in direction, and had a 

 frequency of about three per second. In his opinion the disturbance 

 ceased abruptly. Many observers detected a distinct rocking motion 

 sufficient to cause trees to sway, and to disturb the balance of those 

 standing or attempting to walk. 



Those who were awake at the time record hearing noises which are 

 said to resemble the rushing sound of a gale or a railway train in 

 motion. 



From an analysis of my own notes of injury to buildings, etc.. and 

 the observations of eye-witnesses the oscillation appears to have come 

 from practically every direction. To a number of comp> tent observers, 

 however, the motion in the case of the chief shock appeared to be 



