364 MIDDLEMISS : KANGRA EARTHQUAKE. 



explanation may lurk in the larger scale on which the mountain and 

 valley features are represented in Kulu. The steeper and longer slopes, 

 the more profound gorges and precipitous crags, as has already been 

 shown in the narrative part of this book, were much riven by surface 

 slips during and for long after the earthquake. Now, although it is not 

 to be supposed that a rock slide, even on a grand scale, would cause a 

 tremor that could be felt even a few miles away — it being far too super- 

 ficial for that — it is quite likely that the ragged surface of Kulu as 

 represented by its mountain and valley features is to a large extent 

 reflected in the immediate under crust, and that a vast number of 

 thrust and shear planes splitting up the old rocks of that area descend 

 into that crust and are linked up with others which ultimately combine 

 with the one or more that was the seat of the original earthquake. On 

 that supposition the larger number of recorded shocks in Kulu becomes 

 a normal and intelligible phenomenon. 



Continuing our scrutiny of the list, we find that the severe or smart 

 shock (accompanied by a rumbling; of October 7th at Bajaura in Kulu 

 given as 8 p.m. was picked up by both the instruments in Simla. The 

 same happened with the shock of October 14th, given as 5-40 a.m. at 

 Bajaura, and 5-55 a.m. at Simla on the one instrument, and 6-13 a.m. 

 on the Omori seismograph. Again on October 17th we have the 

 same thing, the shock being also recorded from Mussoorie. On Octo- 

 ber 20th a shock felt in Simla and recorded by the two seismographs 

 was also felt at Naggar. On the 23rd another, not felt, was similarly 

 recorded at Simla and Naggar. In this way the records go on with 

 occasional agreements between the distant stations to the end of the 

 year, and with an occasional sharper one such as that of November 

 23rd felt between 3 and 4 a.m. at Bajaura, and also recorded at Simla, 

 Dehra Dun and Rurki. 



Looking back as far as April 11th, where, as already explained, the 

 records first begin to be sufficiently clear for the 



Frequency indi- ° * 



oated since April identification of individual shocks, we find that in 

 Uth - early April the average was about 7 separate shocks 



per day and that this gradually diminished until by the end of the year 

 rather less than 1 shock per day is recorded. 



