FORESHOCJCS AND AFTERSHOCKS. 367 



earthquake where it touches the Sutlej valley, and it may represent 

 a more near-the-surface rupture possibly continuous with the axial 

 centrum of that earthquake. 



The fact of the secondary aftershocks being so much more pro- 

 nounced in this direction than at Bajaura and elsewhere in Kulu and 

 Kangra also indicates that the actual centrum of the big aftershock has 

 exhibited in this case well-marked migration to the E.S.E. and up- 

 wards from the general position of the grand centrum of the disaster of 

 4th April. 



After the 3rd March the frequency of the aftershocks sink to about 

 1 a day towards the end of the month. In April and May the after- 

 shock record returns to its normal state. On May 20th, 1906, occur- 

 red a moderately severe aftershock recorded from Mussoorie, Delhi, 

 Dehra Dun, Lahore, Bijnor and Rurki. It was pronounced in the 

 neighbourhood of Mussoorie, Dehra Dun and Rurki, where it was 

 noticed by everyone, and doors and windows rattled and lamps swung* 

 Although I have received no reports from the Kangra -Kulu area it is 

 stated in the Monthly Weather Report to have been felt over a large 

 part of Kashmir and at Skardu, Dras, Sonemarg and Leh. The 

 larger waves were recorded at the Simla Observatory by the Omori- 

 Ewing seismograph at 16h. 42* 2m., the disturbance lasting 18*8 minutes. 

 It does not appear to have affected the Alipur instrument, though a 

 doubtful shock is recorded by the latter about an hour before. The 

 only record for the latter part of May is a severe shock at Bajaura on 

 the 26th followed by 3 milder ones on the 28th. 



On June 13th at 11 15 p.m., as given in the Omori seismograph 

 record at Simla, there was a sharp to severe shock lasting 3 or 4 

 seconds described from Simla as the worst since the 28th February 

 1906. The Imperial Secretariat buildings on Gorton Hill were slightly 

 damaged and many natives spent the night in the open. At Bajaura 

 it was felt severely, and every one ran out of doors alarmed. At 

 Dehra Dun it was smart, rather severe at Seharanpur and felt also 

 at Chakrata and Meerut. At Mussoorie a shock about the same 



