1843. J Memoir on Indian Earthquakes. 283 



9. Earthquake of the 26th September, 1842. 



This shock was experienced at Delhi, and like that of the 25th July, 

 appears to have been strictly local in its character. It is described as 

 " a very smart shock of an Earthquake, accompanied by a tremendous 

 rumbling, and lasted not less than two or three minutes." It occur- 

 red about 9 a. m., and Mr. Bingham informs me, its direction was 

 apparently from W. to E. 



10. Earthquake of the 27th September, 1842. 



The vicinity of Delhi was the seat of this Earthquake also, which 

 was slight in its character, and came in the same direction as the 

 preceding. Beyond the movement of the Earth, no other effects were 

 perceptible. 



The repeated local shocks to which the neighbourhood of Delhi is 

 subject, prove distinctly, that a focus of active Earthquaking force is 

 situated close by it. And in looking for the locality of this, I have no 

 hesitation in fixing it in the Aravulli range of hills which skirt Delhi, 

 and run in a South-westerly direction from it. The occurrence of the 

 hot springs at Loweah, the disrupted state of the rocks composing the 

 range, the occurrence of secondary trap in abundance, all shew that 

 disturbing forces have existed, and still do exist there. I am confirmed 

 in this opinion, by the result of Mr. Bingham's observations, who has 

 informed me, that all the different local shocks of Earthquake ex- 

 perienced in Delhi, appeared to him to emanate from this range of 

 hills. The limited extent over which the shocks are felt, shews, that the 

 seat of the disturbing force cannot be far from the surface of the earth, 

 while their comparatively feeble intensity proves, that the force itself can- 

 not be of a very energetic character. I shall have occasion in a subse- 

 quent part of this memoir to shew grounds for inferring, that its effects 

 being the standard of comparison, the disturbing force has diminished 

 perceptibly in energy within the last few centuries. To say whether 

 the force emanates from a central point, or whether it acts on a line of 

 some extent is impracticable, with observations indefinite as those 

 hitherto furnished ; but if instruments for recording Earthquake shocks 

 are ever employed in India, Delhi ought to be one of the places 



