80 



((•<;(, IN r.KuWN: Till'. BURMA EARTHQUAKES OF MAY L912. 



Simla. — The following data were obtained from the two instru- 

 ments of the Omori-Ewing type in Simla (PI. No. 8) : — 



A = East unci West component. 

 13=: North and South component. 



Time ot commencement of 1st Preliminary Tremor, A = 2 houis 28-4 minutes. 



., ., „ » B=s2 ., 28-6 



., 2nd „ „ A=2 „ 81-3 



,, ,, ,, .. .. »» B=2 ,, .5- '3 ,, 



, „ „ „ Long Wave, Aa2 „ 36-6 



, „ „ >, „ „ H = 2 „ 35-7 „ 



Owing to the style touching the stops, the time and displacements ol the maxi- 

 mum amplitude cannot he given. 

 Time of approximate end of movement, A = 4 hours 36 minutes. 



>> ,, M >> it 15 = 4 ,, o7 ,, 



,, ,, duration, A = 2 ,, 7-(> ,, 



„ ,, ,, ,, ii ll = L ,, 8-0 ,, 



On the seismograph trace. (PI. No. 8), the following corrections 

 to the minute marks are necessary to find Indian Standard Time : — 



Instrument with hoom, K. W. —2-7 minutes. 

 ,, ,, „ X. — S. — 2-2 ,, 



Bombay.— The following data were obtained from the Omori-Ewing 



instrument in Bombay (PI. No. 11) :— 



Time of commencement of the Preliminary Tremors, 2 hours 28-!» minutes. 

 ,, ,, „ „ ,, 2nd Phase ,, 2 ,, 331 



„ „ „ „ „ Large Waves, 2 „ 38-4 „ 



The maximum was lost as the zero shifted and the pen lay against the W. stop. 

 Approximate end of the movement* 4 hours 42-7 minutes. 



On the seismogram a smaller disturbance is noted which took 

 place on the previous day, commencing at 23 hours 147 minutes. 



The Milne instrument in Bombay gave the following figures 

 (PI. No. 9) :— 



Time of commencement of the Preliminary Tremors, 2 hours 28-0 minutes. 



,, ,, ,, ,, ,, 2nd Phase Preliminary Tremors, 2 hours 33-6 minutes. 



,, ,, • ,, ., ,, Large Waves, 2 hours 38*6 minutes. 



The Maximum (1st) is timed at 2 hours 42*5 minute 



,, ,, (2nd) ,, between 2 hours \'.>'A minutes and 2 hours 4 II minutes. 



For hours prior to the quake the trace is disturbed by small 

 tremors and hence the previous quake is masked. Two thicken- 

 ings showing maxima, however, can be indicated at 22 days 23 

 hours 18'6 minutes and at 23 days hours 3'9 minutes. 



