POSTSCRIPT. 
Since the foregoing was sent to press to be finally printed off, 
the following information has reached me from the Superintendent, 
Trigonometrical Survey, Survey of India, embodying the results 
obtained by No. 17 party (Levelling) in the area affected by the 
earthquake. As the results obtained by the Levelling Party not 
only confirm tlie results of my investigation, but also add to the 
information hitherto available, I am appending them as a post- 
script to the report. The following is a copy of a portion of the 
report submitted for the Board of Scientific Advice, by the Superin- 
tendent, Trigonometrical Surveys, who writes : — ■ 
"This portion relates to the subsidence shown by re-levehnent of the 
Silchar-Comilla line due to the Srimangal earthquake of 8th July 1918. 
The results wll, I believe, be of interest to the Geological Survey, and 
seem to confirm the theory that the earthquake was due to a subterranean 
fault parallel to the major axis of the epicentral area, inclined to the west 
south west. 
MEMORANDUM ON THE RE-LEVELMENT OF THE LINE SILCHAR 
TO COMILLA. 
The line Silchar to Comilla was originally levelled in 1911-12. Revision 
was undertaken in the winter of 1919-20 to investigate whether any dis- 
turbance had taken place during the earthquake of 8th July 1918, the 
epicentre of which was reported in the Records of the Geological Survey 
of India, Volume XLIX, Part III, 1918, to be in the BaUsera Hills near 
Kalighat, Si miles south of Srimangal Railway Station. It is to be regretted 
that the mark-stone of Charamani, H. S. which was connected by spirit 
levelling in 1911-12 and the location of which cannot have been a quarter 
of a mile from the epicentre, was destroyed by the earthquake and the 
pillar razed to the ground. Thus no comparison of this point was possible. 
The knoll on which the H. S. stood and the spurs immediately south of 
it bore deep fissures zig-zlagging down the hillsides. 
The G. T. S. bench marks north of, and within a quarter of a mile of, 
Srimangal Railway Station, which was practically destroyed by the earth- 
quake, show no subsidence, nor is there any evidenc:! of regular disturbance 
west of Srimangal until the low range of hills six miles west of it, and 
lying between Satgaon and Rasidpur, is crossed. Three quarters of a mile 
north of Rasidpur Railway Station, a tree bench mark at Kamaichara 
shows practically no alteration ; a mile and a half west of this the settle- 
ment of all bench marks begins. The settlement varies from one and a 
( 56 ) 
