The gravimetric picture of magmatic and hydrothermal sources driving hybrid unrest on Tenerife in 2004/5

摘要: Abstract We present results from the inversion of gravity changes observed at central volcanic complex (CVC) Tenerife, Canary Islands, between May 2004 and July 2005. Marking a period elevated activity reawakening system, data depict spatial temporal variations in sub-surface processes that defined this unrest Pico Viejo (PV)–Pico Teide (PT) complex, after last eruption on Tenerife 1909. An initial non-linear inversion, based 3D line segments approximation, yielded three depths 1 km a.s.l. 2 km b.s.l. Our interpretation is represent apparent composite sources, superposition deep shallow seated sources. therefore decomposed into parts (fields) using procedure triple harmonic continuation. The fields could then be inverted separately, same methodology. field constrains two connected depth about 6 km b.s.l., center NW seismogenic zone VT event swarm seismic unrest, we interpret as magma input. images weak are all situated very shallow, near-surface depths. hydrothermal sources potentially excited by deeper injection. indicate no significant input phonolitic plumbing system PV–PT but rather deeper-seated rejuvenation mafic feeder reservoir. emerging picture our analysis 2004/5 was hybrid nature due to combination injection (failed eruption?) coupled with fluid migration identified causative link indicates presence permeable pathways for CVC.