FORESHOCKS AND AFTERSHOCKS. 359 



furnished by Mr. J. A. Cunningham, Acting Meteorological Reporter to 

 the Government of India, it is not possible to correlate any one with 

 those recorded from Upper India. The big shock itself was, of course, 

 registered, but it was apparently not followed by any others capable 

 of influencing the far distant instrument at Calcutta until the 28th 

 February 1906. The register of the big shock stood absolutely alono 

 even on the dav of the shock itself when severe and numerous after- 

 shocks shook the meizoseismal area. 



A few shocks from neighbouring regions such as the Murree Hills, 



Doubtful after- Rajputana, and even Baluchistan will be found in- 



shocks from neigh- eluded in the list of aftershocks, not in the belief 



bouring regions, 



that they are simple aftershocks proceeding from 

 the main centrum or from subsidiary more superficial local centra con* 

 nected with the main centrum, but because it may be convenient to 

 have these outside local shocks handy for comparison, in ca,3e it may 

 be shown that the responsivity of outside unstable regions is in any 

 way sympathetically aroused by the near presence of an area where 

 aftershocks are in the chronic stage — a supposition that might well be 

 maintained. Some notable foreign shocks are added. 



To be ideally complete, an account of the aftershocks should not 

 only supply us with the exact time, but should also tell us something 

 about 'the areas over which each was felt, and more particularly the 

 place of the epicentrum — as to whether it showed any tendency to 

 wander to more outlying portions of meizoseismal area. It should 

 also give us certain measures of intensity just as in the case of the 

 parent shock. In what follows it will be seen that we are very far 

 from being able to compile such an ideally complete account. 



Brief analysis of the list of Aftershocks, 



During the day of the earthquake and the next few succeeding 

 days the evidence points clearly to a very large 



Great frequency r j j o 



of the early after- number of shocks, but it should not be forgotten 



rent than ied. apP& " that ma ny recorded as separated in time by only a 



short interval were probably synchronous, depend- 



