Publication Date:
2022-06-13
Description:
On March 15th 2007 a paroxysmal explosion occurred at the Stromboli volcano. This event generated a large
amount of products,mostly lithic blocks, someofwhich impacted the ground as far as down to 200 m a.s.l., about
1.5 kmfaraway fromthe active vents. Two days after the explosion, a newvapouremissionwas discovered on the
north-eastern flank of the volcanic edifice, at 560 m a.s.l., just above the area called “Nel Cannestrà”. This new
vapour emission was due to a block impact. In order to investigate the block impact area to understand the
appearance of the vapour emission, we conducted on May 2008 a multidisciplinary study involving Electrical
Resistivity Tomography (ERT), Ground Penetrating Radar (GPR), Self-Potential (SP), CO2 soil diffuse degassing
and soil temperature surveys. This complementary data set revealed the presence of an anomalous conductive
body, probably related to a shallow hydrothermal level, at about 10–15 m depth, more or less parallel to the
topography. It is the first time that such a hydrothermal fluid flow,with a temperature close to thewater boiling
point (76 °C) has been evidenced at Stromboli at this low elevation on the flank of the edifice. The ERT results
suggest a possible link between (1) the main central hydrothermal system of Stromboli, located just above the
plumbing system feeding the active vents, with a maximum of subsurface soil temperature close to 90 °C and
limited by the NeoStromboli summit crater boundary and (2) the investigated area of Nel Cannestrà, at
~500 m a.s.l., a buried eruptive fissure active 9 ka ago. In parallel, SP and CO2 soil diffuse degassingmeasurements
suggest in this sector at slightly lower elevation fromthe block impact crater a magmatic and hydrothermal fluid
rising system along the N41° regional fault. A complementary ERT profile, on May 2009, carried out from the
NeoStromboli crater boundary downto the block impact crater displayed a flank fluid flowapparently connected
to a deeper system. The concept of shallow hydrothermal level have been compared to similar ERT results
recently obtained onMount Etna and La Fossa cone of Vulcano. This information needs to be taken into account in
general fluid flow models on volcanoes. In particular, peripheral thermal waters (as those bordering the northeastern
coast of Stromboli) could be contaminated by hydrothermal and magmatic fluids coming from regional
faults but also from the summit.
Description:
Published
Description:
111-119
Description:
1.2. TTC - Sorveglianza geochimica delle aree vulcaniche attive
Description:
1.5. TTC - Sorveglianza dell'attività eruttiva dei vulcani
Description:
JCR Journal
Description:
reserved
Keywords:
Stromboli
;
hydrothermal system
;
adventive hydrothermal flow
;
electrical resistivity tomography
;
self-potential
;
soil diffuse degassing
;
temperature
;
2007 Stromboli eruptive crisis
;
04. Solid Earth::04.08. Volcanology::04.08.04. Thermodynamics
;
04. Solid Earth::04.08. Volcanology::04.08.07. Instruments and techniques
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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