Publication Date:
2017-04-04
Description:
In this work we present seismological and ground deformation evidence for the phase
preparing the July 18 to August 9, 2001 flank eruption at Etna. The analysis performed, through data from
the permanent seismic and ground deformation networks, highlighted a strong relationship between
seismic strain release at depth and surface deformation. This joint analysis provided strong constraints on
the magma rising mechanisms. We show that in the last ten years, after the 1991–1993 eruption, an overall
accumulation of tension has affected the volcano. Then we investigate the months preceding the 2001
eruption. In particular, we analyse the strong seismic swarm on April 20–24, 2001, comprising more than
200 events (Mmax = 3.6) with prevalent dextral shear fault mechanisms in the western flank. The swarm
showed a ca. NE-SW earthquake alignment which, in agreement with previous cases, can be interpreted as
the response of the medium to an intrusive process along the approximately NNW-SSE volcano-genetic
trend. These mechanisms, leading to the July 18 to August 9, 2001 flank eruption, are analogous to ones
observed some months before the 1991–1993 flank eruption and, more recently, in January 1998 before the
February-November 1999 summit eruption.
Description:
Published
Description:
1469-1487
Description:
partially_open
Keywords:
Ground deformation
;
volcano seismology
;
Mt. Etna Volcano
;
intrusive mechanism
;
04. Solid Earth::04.03. Geodesy::04.03.01. Crustal deformations
;
04. Solid Earth::04.06. Seismology::04.06.08. Volcano seismology
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
Format:
513 bytes
Format:
878745 bytes
Format:
text/html
Format:
application/pdf
