Publication Date:
2017-04-04
Description:
We have deformed basalt from Mount Etna (Italy) in
triaxial compression tests under an effective confining
pressure representative of conditions under a volcanic
edifice (40 MPa), and at a constant strain rate of 5 10 6 s 1. Despite containing a high level of pre-existing
microcrack damage, Etna basalt retains a high strength of
475 MPa. We have monitored the complete deformation
cycle through contemporaneous measurements of axial
strain, pore volume change, compressional wave velocity
change and acoustic emission (AE) output. We have been
able to follow the complete evolution of the throughgoing
shear fault without recourse to any artificial means of
slowing the deformation. Locations of AE events over time
yields an estimate of the fault propagation velocity of
between 2 and 4 mm/s-1. We also find excellent agreement
between AE locations and post-test images from X-ray
microtomography scanning that delineates deformation
zone architecture. Citation: Benson, P. M., B. D. Thompson,
P. G. Meredith, S. Vinciguerra, and R. P. Young (2007),
Imaging slow failure in triaxially deformed Etna basalt using
3D acoustic-emission location and X-ray computed
tomography
Description:
Published
Description:
L03303
Description:
2.3. TTC - Laboratori di chimica e fisica delle rocce
Description:
JCR Journal
Description:
reserved
Keywords:
fault imaging
;
04. Solid Earth::04.08. Volcanology::04.08.05. Volcanic rocks
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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