392 
DR. CHARLES DAVISON ON THE [Aug. 1902, 
VI. Orniern oF THE EARTHQUAKES. 
In the absence of a definite fault-scarp,' it would be difficult to 
obtain clearer evidence than that given above of the connection 
between several of the Inverness earthquakes and the great 
26’ 
Centres of the epicentral areas of the 
Inverness earthquakes. 
Dochgarrocho 
©g 
3) ®, ©, 
pale of Miles 
a = Fore-shock a (p. 379). 
B = Principal earthquake (p. 579). 
ec = After-shock ¢ (p. 385). 
g = After-shock g (p. 385). 
h = After-shock h (p. 386). 
m= After-shock 7 (p. 388). 
n= After-shock m (p. 388). 
q = After-shock g (p. 390). 
boundary-fault. The 
axes of the  iso- 
seismal lines are 
parallel to the mean 
direction of the fault: 
the epicentres, or the 
centres of the inner 
isoseismals (see text- 
figure) lie a short 
distance to the 
south -east of the 
fault, that is, on the 
side to which the 
fault hades; and 
most of them lie 
_ within a band which 
is nearly parallel to 
the fault-line and 
the centre of which 
is less than a mile 
south-east of Doch- 
garroch. 
The dots in the 
figure mark only the 
centres of the epi- 
central areas. In 
many earthquakes, 
the focus was no 
doubt small (possibly 
less than a mile in 
length); but in the 
principal earthquake 
and in the after- 
shocks of September 
18th, 3.56 and 9 a.m., 
and September 30th, 
3.39 A.M. (denoted 
by the letters g, h, 
and 7), its length 
must have amounted 
to several miles. 
i bjection to the fault- 
- bsence of a fault-scarp is sometimes felt as an obj fault 
sli shee Bae when the slip within the focal area is small (perhaps, in this 
ee only a fraction of an inch), it would die out before reaching the surface. 
i 
