Publication Date:
2017-04-04
Description:
On February 27, 2007 a new eruption started at Stromboli that lasted until April 2 and included a paroxysmal
explosion on March 15. Geochemical monitoring carried out over several years revealed some appreciable
variations that preceded both the eruption onset and the explosion. The carbon dioxide (CO2) flux from the
soil at Pizzo Sopra La Fossa markedly increased a few days before the eruption onset, and continued during
lava effusion to reach its maximum value (at 90,000 g m−2 d−1) a few days before the paroxysm. Almost
contemporarily, the δ13CCO2 of the SC5 fumarole located in the summit area increased markedly, peaking just
before the explosion (δ13CCO2~−1.8‰). Following the paroxysm, helium (He) isotopes measured in the gases
dissolved in the basal thermal aquifer sharply increased. Almost contemporarily, the automatic station of CO2
flux recorded an anomalous degassing rate. Also temperatures and the vertical thermal gradient, which had
been measured since November 2006 in the soil at Pizzo Sopra La Fossa, showed appreciable variabilities that
lasted until the end of the eruption. The geochemical variations indicated the degassing of a new batch of
volatile-rich magma that preceded and probably fed the paroxysm. The anomalous 3He/4He ratio suggested
that the ascent of a second batch of volatile-rich magma toward the surface was probably responsible of the
resumption of the ordinary activity. A comparison with the geochemical variations observed during the
2002–2003 eruption indicated that the 2007 eruption was less energetic.
Description:
Published
Description:
246-254
Description:
1.2. TTC - Sorveglianza geochimica delle aree vulcaniche attive
Description:
JCR Journal
Description:
reserved
Keywords:
geochemistry
;
eruption
;
dissolved gases
;
Stromboli
;
volcanic activity
;
03. Hydrosphere::03.02. Hydrology::03.02.03. Groundwater processes
;
03. Hydrosphere::03.04. Chemical and biological::03.04.03. Chemistry of waters
;
03. Hydrosphere::03.04. Chemical and biological::03.04.05. Gases
;
03. Hydrosphere::03.04. Chemical and biological::03.04.06. Hydrothermal systems
;
04. Solid Earth::04.04. Geology::04.04.12. Fluid Geochemistry
;
04. Solid Earth::04.08. Volcanology::04.08.01. Gases
;
04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring
;
05. General::05.02. Data dissemination::05.02.01. Geochemical data
;
05. General::05.02. Data dissemination::05.02.03. Volcanic eruptions
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
