HR: 1330h
AN: V23A-02    [Abstracts]
TI: Preliminary Results of Continuous gas Geochemical Monitoring at Solfatara Volcano (Campi Flegrei) Southern Italy
AU: * Somma, R
EM: rsomma@katamail.com
AF: Osservatorio Vesuviano INGV, Via Diocleziano, 388, Naples, 80124 Italy
AU: Castrillo, A
AF: Dipartimento di Scienze Ambientali, Seconda Università di Napoli, Via Vivaldi, 43, Caserta, 81100 Italy
AU: Gianfrani, L
AF: Dipartimento di Scienze Ambientali, Seconda Università di Napoli, Via Vivaldi, 43, Caserta, 81100 Italy
AU: Gagliardi, G
AF: INOA, Via Campi Flegrei, 34, Naples, 80078 Italy
AU: De Natale, G
AF: Osservatorio Vesuviano INGV, Via Diocleziano, 388, Naples, 80124 Italy
AU: De Natale, P
AF: INOA, Via Campi Flegrei, 34, Naples, 80078 Italy
AU: Rocco, A
AF: INOA, Via Campi Flegrei, 34, Naples, 80078 Italy
AU: Tedesco, D
AF: Dipartimento di Scienze Ambientali, Seconda Università di Napoli, Via Vivaldi, 43, Caserta, 81100 Italy
AB: While continuous geophysical monitoring have become widely accepted as major tools for volcanological forecasting, geochemical surveillance of volcanic activity is still less frequently applied. Investigations on the chemistry and mineralogy of fumaroles gas and sublimates as well as isotopic investigations of volcanic gas sampled at Solfatara volcano (Campi Flegrei southern Italy) were performed using various methodologies prevailing on monthly/weekly basis since the bradisesmic crisis 1983-84. This scattered gas chemical investigations gave important information on the behavior of the Solfatara volcano system but did not record systematic short term gas variation or interdependency of the gases with time. This makes difficult to correlate gas composition data with magma motion, eruptive events or geophysical parameters such as sesmicity, tilt, strain. For this reason, it was, therefore, necessary to develop a new technique for the continuous geochemical monitoring of the volcanic gas. The main objective of our investigations was to set up a continuously-operating gas monitoring station equipped with a diode-laser based apparatus (H2O-CO2 concentrations and and „13C of CO2 composition) a quadrupole (amu 1-100) mass spectrometer coupled with an appropriate heating line to prevent any gas condensation before the injection into the analyzing chamber. These mass spectrometric analysis performed at the Solfatara volcano will be important for the evaluation of the gas oscillation phenomenon. Further the highly corrosive prohibitive condition and maintenance needed by these sophisticate instruments will be a key to develop in the near future more simple and less expensive devices based on various sensor technique and innovative material to be installed at the Solfatara volcano in order to allow local authorities and scientists to better understand how volcanoes work.
DE: 4820 Gases
DE: 4825 Geochemistry
DE: 8419 Eruption monitoring (7280)
DE: 8494 Instruments and techniques
SC: Volcanology, Geochemistry, Petrology [V]
MN: 2005 Joint Assembly