Dir. C. Davison — The Pendleton Earth-shake. 



175 



but smaller than in that of the slight, but true, earthquakes. Judging 

 from the lengths of the axes of the inner isoseismal, it can hardly 

 have been less than one mile, and may have been as much as one 

 and a half miles, in length. 



If the earth-shake were due to fault-slipping, the direction of the 

 originating fault must be parallel or nearly so to that of the longer 

 axes of the isoseismal lines, or about N. 37° W. to S. 37° E. ; its 

 hade being indeterminate, since each pair of isoseismal lines is 

 separated by the same distance on both sides of the longer axes.^ 



— — . . . — . ■ , .^ 



ActTeale 



Scale of .7krtZ.es 



Fig. 2. — Isoseismal lines of Etnean Earthquake, Aug. 8th, 1894. 



Now, in the neighbourhood of Pendleton, the mean direction of 

 the Pendleton fault is from N. 34° W. to S. 34° E., and from its 

 position, as indicated by the broken line on the map, we may, 



^ This -would be the case if the vertical dimension of the focus -was small. 



