Seismic activity and an anomalous fumarolic chemical composition due to seal effect in the volcanic system of Deception Island (Antarctica)

• Main Authors: Caselli, Alberto T., Bengoa, Cintia L., Agusto, Mariano Roberto
• Language: unknown
• Published: 2007
• Subjects: Antarctica; Deception Island; Fumarolic gases; Seismology; chemical composition; fumarole; hydrothermal vent; seismicity; volcanology; South Shetland Islands; Argentina; Austral; Antarc*
• Online Access: https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v62_n4_p545_Caselli; https://hdl.handle.net/20.500.12110/paper_00044822_v62_n4_p545_Caselli

In this communication, the genesis of great anomalous seismic activity registered during austral summer 2003/2004 on Deception Island (Antarctica) is discussed, and related with changes on the chemical composition of fumarolic gases and vent deposits. Here we present a comparative analysis performed to explain this activity. We propose a possible parcial seal of the microfracture system. This effect allows an increase on pressure follow by reopening of microfractures, resulting on a sequence of seismic events and changes on the chemical composition of fumarolic emissions. Fil:Caselli, A.T. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Bengoa, C.L. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Agusto, M.R. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.