Dykes are magma-driven extension fractures
and the main conduits for magma
in volcanic eruptions. To understand
the mechanics of dyke emplacement
is thus essential to assess volcanic
hazards. To improve the understanding
of the processes of dyke initiation
from shallow magma chambers and dyke
propagation through a mechanicallylayered
crust, field measurements and
observations from Tenerife (Canary Islands)
are used and compared with the
results from numerical models.
Careful studies of 550 dykes in three
profiles in the Anaga massif (Tenerife)
include measurements of dyke geometry
and orientation. The results of these
measurements show that dykes have been
injected from a deep-seated reservoir
during the shield-building phase. Furthermore,
the dyke attitudes agree with
the main axial trends of Tenerife that
are preserved in the old massifs of Teno,
Anaga, and Roque del Conde...conferenc
