Interactions between volcano-tectonic events and volcanic tremor at Teide – Pico Viejo volcanic complex, Canary Islands

The volcanic complex of Teide - Pico Viejo showed its last effusive eruption in 1909, while the latest explosive one is dated ca. 2000 years b.p. The volcanic complex iscurrently in a phase of possible reawakening that is under investigation with an increasingmonitoring effort by several Spanish and international Institutions. In thistalk we show seismic features connected to this unrest, including the presence ofvolcanic tremor and of a bidirectional interaction between this tremor and volcanotectonic(VT) events. On one side, rather stable spectral and dynamical features in thetime evolution of the volcanic tremor are abruptly interrupted by VT events. On theother side, the time evolution of the RSAM computed on the continuously recorded seismic signal, notwithstanding the superposition of tremor of volcanic origin andhuman-made noise, can be used with the material failure forecast method, to successfullyforecast the time of occurrence of some of the particularly energetic VT eventsand/or of the VT events swarms. Such bidirectional interactions have been detected atdifferent seismic stations installed on the island of Tenerife.