FORESHOCKS AND AFTERSHOCKS. 363 



was not felt, or not severely felt there, whilst the account from Feroze- 

 pore helps to suggest a more southerly locus for this aftershock. 



During the rest of July and early August a number of small after- 

 shocks are recorded, but on August 12th there was a severe shock record- 

 ed from several places in the Murree Hills. As this is only nearly 

 coincident with one recorded in Kulu it seems probable that it had a 

 local origin and was perhaps quite independent of the centrum of the 

 big earthquake of April 4th. 



On August 25th the two severe shocks reported from Deesa (North 

 Gujrat) stand alone and were probably also of local origin. 



During this month, as also in previous ones since seismographs were 

 set up in Simla, there are some noticeable agreements between the 

 shocks reported from Naggar or Bajaura in Kulu and those recorded by 

 the seismographs, as also between other points in the great earthquake 

 area. In the case of the former the agreement most likely indicates a 

 single deep origin. But besides these there undoubtedly have been 

 recorded from Kulu a large number of shocks which gave no trace in 

 the Omori seismograph and did not affect the Agamennone seismoscope. 

 These must, therefore, have proceeded from origins less deep, and have 

 had only a local effect round about Kulu. There is no reason, however, 

 to doubt that they were somehow and distantly connected with the 

 original centrum possibly by means of lines of fracture which are un- 

 known to us. 



In many cases, as the records show, shocks in the Kulu area have 

 been followed or preceded by shocks in the Dharmsala or Simla areas — 

 the records are sandwiched in fact — a state of things which seems to 

 indicate that a superficial (or near the surface) readjustment in the one 

 place called for an early re-adjustment in the others, so as to balance 

 results on each side of the deep main centrum. 



Nevertheless, taken as a whole, the Kulu valley seems to have been 

 richer in aftershocks than any other part of the meizoseismal area. 

 This cannot altogether be apparent only and due to the more conscien- 

 tious recording done by our fellow worker, Colonel Rennick (admirable 

 as that was). It must have been in large measure real, and a probable 



