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  • 1
    Publication Date: 2018-03-22
    Description: The longest records of temperature data from active volcanoes in southern Italy are presented. One dataset comes from continuous monitoring of fumaroles temperature of la Fossa cone of Vulcano (Aeolian Islands), it runs from 1990 to 2014, but the first measurements started in 1984. Another dataset is from thermal aquifers of Mount Etna volcano, since 1989 the acquisition period has been one month, more recently data with hourly frequency are registered on the continuous monitoring network. Both monitoring systems are still ongoing. In 1984 at Vulcano the monitoring of fumaroles suffered of a pioneering approach, our technicians faced for the first time with extreme condition, absence of energy power, temperature range covering up to 2 order of magnitude (from normal ambient to several hundreds °C), steam, corrosive acidic fluids released by fumaroles (Sulphur and Chlorine compounds, Carbon dioxide). The experience matured in the high temperature fumarole field of Vulcano can be useful to support new surveillance programs on other volcanoes around the world. Time series analysis applied to fumaroles temperature highlighted the cyclic character of the main observed variations and major trends, lasting some years. Long term monitoring allowed comparisons of many temperature subsets with other validated geochemical and geophysical dataseries and highlighted common source mechanisms accounting for endogenous processes. Changes in the magma source and/or seismo-tectonic activity are the primary causes of the main time variations. A similar comparative approach has been applied to time series of temperature data recorded on Etna volcano. Time relationships have been found with the eruptive activity, particularly with the emission rates of volcanic products, although the monitoring sites are far from the eruptive vents. The collected data show confirmation about the effectiveness of the geochemical approach to follow in real time changes from the source, even being far from estimation of magmatic energy release retrieved by surface temperature monitoring.
    Description: Published
    Description: Moscone Center, San Francisco CA, United States
    Description: 4V. Dinamica dei processi pre-eruttivi
    Keywords: long-term monitoring ; energy release ; interdisciplinar comparison ; geochemical approach ; 04.08. Volcanology ; Geochemical Monitoring of active volcanoes
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Oral presentation
    Location Call Number Limitation Availability
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  • 2
    Publication Date: 2023-10-18
    Description: Data availability: The source data (ground temperature measurements recorded -hourly- from 2009 to 2012) are submitted to PANGAEA — PDI31617.
    Description: Mild thermal anomalies are sensitive to changes in the advection processes in a volcanic system. A mild thermal anomaly, near the top of the North-East Rift of Mt. Etna (Italy), has been monitored from January 2010 to September 2012 by means of four temperature sensors buried in the shallow ground. The pulses of the convective circulation have been tracked and the diffuse heat flux has been evaluated. The positive pulses of the convective front reflected the local increases of volcanic degassing; conversely, the negative pulses showed the contraction of the convective front emerging through the North-East Rift. The steam condensation depth fluctuated below the monitoring site, from depths of a couple of meters to more than 30 meters, while the New South-East crater was erupting. The data hourly recorded, relative to the 2012 eruptive period, were compared to the radiant energy released by the paroxysms. We registered a dramatic decrease in the diffuse heat flux several hours before the onset of the two most energetic paroxysms (12 and 23 April). Thereafter, the convective front (the steam condensation depth) showed many negative pulses, reaching the deepest recorded levels. Thermal transients could be one of the early signals, possibly heralding transitions in the dynamic equilibrium conditions.
    Description: Published
    Description: 4471
    Description: 2V. Struttura e sistema di alimentazione dei vulcani
    Description: 4V. Processi pre-eruttivi
    Description: 5V. Processi eruttivi e post-eruttivi
    Description: 6V. Pericolosità vulcanica e contributi alla stima del rischio
    Description: 6A. Geochimica per l'ambiente e geologia medica
    Description: 1IT. Reti di monitoraggio e sorveglianza
    Description: 6IT. Osservatori non satellitari
    Description: JCR Journal
    Keywords: thermal monitoring ; diffuse outgassing ; volcanic activity ; transition periods ; steam convection ; energy release ; 04.08. Volcanology
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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