ISOSKISTS. DISTRIBUTION OF INTENSITY, ETC, 99 



same conclusion there. Over the greater part of north-western 

 Siam a similar intensity appears to have been felt. 



As a general rule no damage was caused, nor were objects over- 

 turned, though suspended bodies appear to have freely swung. 



Descriptions of fche Observers have described the shock as 



shook. follows :— 



(1) Like a wave motion gradually increasing to a period of 



highest intensity and then dying away again. 



(2) Like a large animal rubbing itself against the posts of the 



house. 



(3) The bungalow shook as if affected by a gale. 



(4) Slight tremor followed by distinct shock and then Blight 



aftershock ; windows rattled. 



(5) Table and chairs rocked, hanging lamps swung ; no un- 



usual sounds were noticed. 



It is interesting to note that the Yenangyaung Oil Field lies 

 within this area, and although the derricks 



Effect on the i- i , • , 



Yenangyaung Ofl Field. were 8een to # et °P a sl, ^ rht BWing, no damage 



whatsoever was caused to any of the wells, 

 the lining casings of which in some cases extend to depths of 

 almost 2.000 feet. In strata such as these, any violent move- 

 ment of the ground would have resulted in bending or flattening 

 of the pipes and consequent stoppage of the well. 



Isoseists II and III. 



The region included in the outermost isoscismal only partly 



lies in Burma, and I have only been able to 

 Line wanting on east -, , .. . _ 



JU1( l Qorth , draw the One on the west and south. To the 



north it enters the little-known country be- 

 tween Burma and Assam, from which it was quite impossible to 

 obtain any information ; on the north-east and east it crosses into 

 the transfrontier prefectures of Yunnan, and on the south-east it 

 must cut across south-western Siam. 



In the extreme south of the Irrawaddy delta, the officers in 

 Effects i„ B 1 charge of the districts of Bassein, Myanngmva 



and Pyapon reported that no earthquake dis- 

 turbances were experienced in any part of their charges. .From 



h2 



