HR: 13:55h
AN: V13D-02    [Abstracts]
TI: Tidal Modulation of Diffuse CO2 Degassing and Seismic Activity at Teide Volcano,Tenerife, Canary Islands.
AU: * Lopez, D L
EM: lopezd@ohio.edu
AF: Ohio University, Department of Geological Sciences, 316 Clippinger Laboratories, Athens, OH 45701 United States
AU: Salazar, P
EM: psalazar@iter.rcanaria.es
AF: Instituto Tecnologico y de Energias Renovables ITER, Poligono Industrial de Granadilla Granadilla de Abona , Tenerife, 38611 Spain
AU: Hernandez, P
EM: phdez@iter.rcanaria.es
AF: Instituto Tecnologico y de Energias Renovables ITER, Poligono Industrial de Granadilla Granadilla de Abona , Tenerife, 38611 Spain
AU: Marrero, R
EM: rayco@iter.rcanaria.es
AF: Instituto Tecnologico y de Energias Renovables ITER, Poligono Industrial de Granadilla Granadilla de Abona , Tenerife, 38611 Spain
AU: Perez, N M
EM: nperez@iter.rcanaria.es
AF: Instituto Tecnologico y de Energias Renovables ITER, Poligono Industrial de Granadilla Granadilla de Abona , Tenerife, 38611 Spain
AB: A seismic swarm started in April, 2004, to the west-northwest of Teide volcano, in Tenerife, Canary Islands. Teide volcano (3715 m high) is located at the northern scarp of Las Ca¤adas caldera, a large depression produced by multiple episodes of caldera collapse and giant landslides. The basanite-phonolite magmatic system and the hydrothermal system associated with Teide volcano is emitting gases that reach the summit producing weak fumaroles. The efflux of CO2 is measured every hour at a continuous monitoring station that uses the accumulation chamber method. The average daily vertical component of the Earth tide at this volcano has been cross-correlated with the daily seismic energy released from April to August, 2004, and the low frequency component of the CO2 efflux emitted at the submit. This comparison suggests that seismic events and higher release of CO2 efflux occur when the vertical tide component has maximum values. Gravity forces are probably triggering seismic activity of a system that is already unstable. At the same time, variations in gravity forces can generate variations in fluid confining pressure and produce a higher release of CO2 from the hydrothermal system when the pressure decreases. Tidal effects seem to modulate the release of seismic energy and the low frequency CO2 efflux.
DE: 8424 Hydrothermal systems (8135)
DE: 8499 General or miscellaneous
DE: 9820 Techniques applicable in three or more fields
DE: 7280 Volcano seismology (8419)
DE: 5770 Tidal forces
SC: Volcanology, Geochemistry, Petrology [V]
MN: 2004 AGU Fall Meeting