VOLCANIC EARTHQUAKES 107 
seven of the after-shocks were strong. The broken line on the 
map (Fig. 3) includes all the places in which houses were damaged 
by the different shocks of the series. The smaller curves represent 
the meizoseismal areas of the more important shocks. Thus, the 
curves 1 and 2 indicate the meizoseismal areas of the double earth- 
quake of May 7 at 6:35 P.M., 
houses being damaged at 
Piano d’Api (No. 1) and at 
Pennisi and Fiandaca (No. 2). Seay 
At Io P.M. on the same day, poo 
i S © Fondo Macchia 
another strong earthquake | Se 
caused damage at Fossalac- GaN 
/ Dagala g ~ 
qua (No. 3) along a fracture 
which may be a continuation 
of that at Fiandaca (No. 2). 
The principal earthquake 
occurred at 7:2 P.M. on May 8, 
and was ruinous within the 
area bounded by the ellipse 
(No. 4), the zone of complete oe: 
ruin being much less wide. Ne © (Vn, 
With this earthquake also Lat oer Y, ener 
there was a zone of serious  viagrande 
damage to houses at Dagala Scale of Miles 
(No. 5), separated from the MERE A aL OUNace i 
principal zone by a wide tract 
of little or no damage to Prop- Fic. 3.—Map of Linera earthquakes of 1914 
erty. Lastly, the curve No. 6 
shows the boundary of slight damage near Viagrande wrought by 
the after-shock of May 26. 
The meizoseismal area of the principal earthquake (bounded by 
the curve C in Fig. 2 and No. 4 in Fig. 3), within which the ruin 
was practically complete, is very elongated, being about 4; miles 
long, with a maximum width near Linera of 13 miles. In this zone, 
not only are the houses completely razed to the ground, but the 
ground itself is crushed. Along the axis of this zone, there runs 
a slightly sinuous fracture with, in parts, a secondary nearly parallel 
