1S0SEISTS. DISTRIBUTION OF INTENSITY, ETC. 



91 



A grouped scale 

 adopted. 



the detailed study of numerous earthquakes has made it abund- 

 antly clear that on river bottoms and valley floors, especially 

 when the latter are water-logged, buildings are more susceptible 

 to damage than similar structures built on solid rock. 



The regions affected by this earthquake comprise some of the 

 most thinly populated country in the Indian 

 Empire, indeed everywhere in Burma the popu- 

 lation is under 100 persons per square mile. In 

 addition to this, the most severely shaken area lies within the wildest 

 and most thinly populated portion of Burma, that is to say in 

 the western regions of the Northern Shan States, and about their 

 borders with Mandalay and the Ruby Mines Districts and with the 

 Southern Shan States, etc. It has for this reason been found 

 necessary to group together the lower members of the Rossi-Forel 

 scale as shown below, a practice already established by 01dham( 1 ) 

 and Middlcmiss( 2 ) in the accounts of the great shocks of 1897 and 

 1905. For the same reason I am unable to draw the curve which 

 encloses the small area over winch an intensitv of IX was reached. 



Grouped members of the Rossi-Forel scat'. 



Definition taken here. 



11 and 111 



Felt by a few sensitive people lying 



down or favourably situated. 



1 V and V 



Generally noticed, no damage. 

 Shaking of beds, etc. 



VI and VII 



i 



Universally felt. Upsetting of 

 small loose objects. No damage 

 except in rare instances, to burnt 

 brick structures. Small cracks 

 and damage to sun-dried brick 



and mud buildings. 



The resulting curves are shown on the map. It is not contended 

 that they are highly satisfactory, or comparable 



Coves ,.nly appn.xi- w | )h ^ (% j ;( \ )urdiv delinea tious given on reeeni 

 mate. 



maps of the great earthquake-shaken regions of 



1 ( >1< 1 li mi : hoc r.il.. p. 42. 



* MiddlemisB : Lot . < <'.. p. 303 



