THE ISOSEISTS. 



303 



(VIII) Fall of chimneys, cracks in walls of buildings. 

 (IX) Partial or total destruction of some buildings. 

 (X) Great disasters, ruins, disturbance of strata, fissures in the 

 earth's crust, rock-falls from mountains. 



So far as the higher intensities of .VII, VIII, IX and X are con- 

 HHier and lower ce ™ e( l> this mapping, it is believed, has been success- 

 intensities different- fully accomplished. It was, however, hoped that 

 ly determined. a cr itical examination of the effects as detailed in 



the earthquake forms would have enabled the lower intensities, VI, 

 V, IV, III and II to be similarly inserted on the map over the unvisited 

 areas. With this object the individual forms were all separately valued, 

 each on its own internal evidence*, and the numbers assigned were 

 afterwards entered on the map. It was then found that not only were 

 there great gaps in the more circumferential regions, but also that the 

 figures covering the well-reported area showed a considerable inter- 

 mingling. 1 The lower isoseists therefore and with them isoseist VII 

 have been finally grouped together as follows : — 



Grouped members of the Rossi- 

 Forel scale. 



Definition taken here. 



II and III . 



IV and V 



VI and VII . 



Felt by a few sensitive people lying down 

 or favourably situated. 



Generally noticed, no damage. Shaking of 

 beds, etc. 



Universally felt. Upsetting of small, loose 

 objects. No damage, except in rare in- 

 stances, to burnt brick structures. Small 

 cracks and damage to sun-dried brick and 

 mud buildings which are so common in 

 India. 



l It must also be confessed that the figures allotted were in many eases rather arbitrary 

 on account of the difficulty in rural districts of correlating such purely European 

 standards as ringing of church and house bells, swinging of chandeliers and cracking 

 of ceilings. 



