KiNAHAN — On the Earthquake in Essex. 325 



said a shock was felt at 11.8 p.m.) ; Sudbury, 2 ; and Colchester, 

 2 or 3. 



In the Peldon area, it is stated by Dr. Grreen of Croagh and 

 the people of the village of Peldon, that a slight quake was felt 

 about sis or eight weeks before April 22. 



Summary. 



The area of structural damage was limited, but in the country 

 surrounding it the shock was felt for considerable distances. 



In the area of structural damages there were smaller areas in 

 which the effects were greatest. These smaller areas are distinctly 

 margined at two or more sides by well-marked lines, while at one 

 or two of these lines the maximum damage in each occurred. The 

 greatest damage was done in the Peldon and Abberton areas. 



In the areas of greatest effect, the shock travelled in different 

 directions ; yet, in all, the shock appears to have occurred at the 

 same moment. 



The geological formations in the area of structural damage are 

 " London clay," " glacial drift," and " alluvium." In two places, 

 Eastbridge, Colchester, and at Wivenhoe, damages were observed 

 on the latter, while from the north portion of Wivenhoe to Aires- 

 ford, and in the northern part of Colchester, damages occur on the 

 glacial drift ; but elsewhere all damages, especially the greater 

 ones, are found on the London clay ; while nearly invariably the 

 destruction ceased at the margin of the younger accumulation. 



