HR: 14:40h
AN: V52C-05    [PDF]
TI: Volcanic Activity Evaluation by the Mean of Soil Temperature Continuous Monitoring During the 2002-2003 Eruption at Stromboli Volcano (Eolian Islands, Italy)
AU: * Madonia, P
EM: madonia@pa.ingv.it
AF: Istituto Nazionale di Geofisica e Vulcanologia-Sezione di Palermo, Via Ugo La Malfa 153, Palermo, 90146 Italy
AU: Brusca, L
EM: brusca@pa.ingv.it
AF: Istituto Nazionale di Geofisica e Vulcanologia-Sezione di Palermo, Via Ugo La Malfa 153, Palermo, 90146 Italy
AU: Longo, M
EM: manfredi@pa.ingv.it
AF: Istituto Nazionale di Geofisica e Vulcanologia-Sezione di Palermo, Via Ugo La Malfa 153, Palermo, 90146 Italy
AB: Stromboli volcano is characterised by both strombolian activity and periodic isolated paroxysmal events of mayor intensity, the more recent of which started on December 27th, 2002 and terminated on August, 2003. The eruptive event may be subdivided into two major phases, separated by a big explosion that took place in April 5th, 2003. During the first phase we observed a lack of activity at the top craters, due to the opening of some eruptive fractures at altitudes between 500 and 600 m a.s.l., along the so called "Sciara del fuoco", on the northern flank of the edifice. The April 5th explosion, from crater \#1, occurred under condition of partial obstruction of the vent, caused launching and fall-down of lava fragments and rock blocks of several hundreds of kilograms in an area of about 1 km around the mountain top. After the explosion the eruption evolved towards a progressive renewal of activity at top craters, accompanied with a diminution of the lava flow rates from the fractures, until their complete closure occurred during August, 2003. These different phases were well detected by a network of soil temperature monitoring stations, composed of two multi-parametric (CO2 fluxes-soil temperature-meteorological parameters) stations, located in the top area (STR02) and at sea level (STR01), with continuous operations from January 2003, and other 3 provisory temperature-only dataloggers, placed at different altitudes between the two previous cited stations, that operated in a time range of 1 to 3 months. In particular, during the first phase we observed several cycles of cooling-warming of the soil at STR02, with frequencies of few days. The April explosion occurred just after a thermal anomaly of 3-4$\deg$C, that interrupted the seasonal soil warming, well detected at STR01. The final phase of the eruption was characterized by stable temperatures at STR02 and little well-defined thermal anomalies detected either at STR01 either at the other temperature dataloggers. The acquired thermal data seem to represent a useful tool in volcanic activity monitoring but, on the other hand, they need to be validated also under different seasonal conditions. The major detected anomalies, in fact, did not occurred during the warmest months (June-July), when the strong soil warming, due to high solar irradiance, may mask the volcanic-induced effects.
DE: 5134 Thermal properties
DE: 7280 Volcano seismology (8419)
DE: 8130 Heat generation and transport
DE: 8414 Eruption mechanisms
DE: 8419 Eruption monitoring (7280)
SC: Volcanology, Geochemistry, Petrology [V]
MN: 2003 Fall Meeting