#8 Mr. C. Davison. 



on both sides of tlie fault, and close to it, there is a meizoseismal 

 area ;* but the maximum intensity is greatest in the area situated 

 on the side towards which the fault hades. (3.) Other conditions 

 being the same, isoseismal lines which can be traced on both sides of 

 the fault are further apart on the side towards which the fault hades. 

 (4.) The nature of the fault-slip may be ascertained to a certain ex- 

 tent by the relative positions of the isoseismal lines, and by the time- 

 and space-relations of the sound and shock. 



Disturbed Area and Isoseismal Lines. 



On the accompanying map are shown the principal places within 

 the disturbed area and those to which reference is made in this 

 paper. The three curves are isoseismal lines corresponding to in- 

 tensities 5, 4, and approximately 3 of the Eossi-Forel scale. The 

 latter may be regarded as practically the boundary of the disturbed 

 area, though records have come from four places outside it where the 

 shock was very slightly felt. In drawing this line the knowledge of 

 the places where no trace of the earthquake was perceived has been 

 of considerable service. 



The disturbed area is 58 miles long and 46 miles broad, and con- 

 tains about 2066 square miles. The isoseismal 4 encloses an area 47 

 miles long, 34 miles broad, and of about 1251 square miles ; that in- 

 cluded by the isoseismal 5 is 17J miles long, 12 miles broad, and of 

 about 163 square miles. The directions of the longer axes of the 

 three curves are about W. 38 K and E. 38 S., W. 40 1ST. and E. 

 40 S., and W. 31 N. and E. 31 S., respectively, the second prob- 

 ably being the most accurate. The longer axis of the isoseismal of 

 intensity 4 lies on the north-east side of that of the isoseismal 5, and 

 we therefore conclude that, if the earthquake be fault-formed, the 

 direction of the fault must be about W. 40 K and E. 40 S., and its 

 hade must be to the north-east. 



The principal meizoseismal area is a narrow band, nearly parallel 

 to the longer axis of the isoseismal 5, and at a short distance from it 

 on the north-east side. It extends from Sheepshed to the neighbour- 

 hood of Rothley, a distance of eight miles. The intensity was 

 greatest at and near Woodhouse Eaves. 



On the opposite side of the axis of the same isoseismal there is 

 another, though less distinctly marked, meizoseismal area, which 

 includes Markfield, but the intensity here was less than in the north- 

 east meizoseismal area. 



This confirms the previous conclusion that the fault must hade to 

 the north-east. It also shows that the fault-line must pass between 



* The term " meizoseismal area " is here used as denoting an area where the 

 intensity is greater than in the surrounding region. 



