54 STUAHT : THE SRIMANGAL EAILTHQUAKl-; OF 8TII JULY 1918. 
Time. 
Duration. 
Observing 
Station. 
— — — . 
July— 
8th . . . • . 
5 P.M. . . , 
1 second . 
Shillong. 
8th . . . • . 
1 second . 
Shillong. 
:itn • • ■ ■ • 
4 P.iM. . . . 
4 seconds 
ouiiiong. 
11th . 
M- i l.n. I. . . 
Calcutta. 
X itn . . . • . 
1 1 -5 P. M. . . 
3 seconds 
Diiiiiong. 
I it'll • • • • . 
1 1 P.M. , • . 
5 seconds 
Sriniangal. 
1 llh . . . • . 
I 1 Tt AT 
II P.M. . . 
2 seconds 
]Myniensingli» 
1 1 fit 
00 yl 1 T Q 
10 seconds 
Narainganj. 
1 1 f u 
20 seconds 
Gauhati. 
litii ..... 
OO /I 0 T Q T* 
7 seconds 
Berhampur. 
iltli . . . > . 
00 QQ T Q T 
L/aicutba. 
11th 
11-10 P.M. 
Few seconds 
Chandpur. 
12th 
6-31 I.S.T. . 
5 seconds 
Narainganj.; 
12th 
7 A.M . 
1 second . 
Srimangal. 
12th 
7-15 A.M. 
2 seconds. 
SMUong. 
12th 
6-31 I.S.T. . 
Calcutta. 
is 10 hours 22 minutes 2 
seconds while that suggested by the Indian 
Observatories is 10 hours 21 minutes 50 Seconds G.M.T. Of the 
two I prefer to assume the latter as being more probable as it does 
not mean that the arrival of the Preliminary vibrations at the various 
observatories was earlier than it is calculated that they should have 
been due. 
In any case there is only a difference of 12 seconds between the 
two times. The speed of the Long waves seems to have been high, 
viz., 3"7 km. per second. It is difhcult to explain why this should 
have been so, but with the agreement of so many observations 
that the time at origin must have been approximately 10 hours 
21 minutes 50 seconds G.M.T. . there does not seem to be any doubt 
that 3'7 km. per second was the actual rate of travel of the Long 
waves in this earth(j[uake. 
