S22C-06:
4-D Noise-Based Seismology at Volcanoes: Ongoing Efforts and Perspectives
Tuesday, 16 December 2014: 11:35 AM
Florent Brenguier1, Michel Campillo1, Nikolai Shapiro2, Diane N Rivet3, Tetsuya Takeda4, Yosuke Aoki5 and Albanne Lecointre1, (1)University Joseph Fourier Grenoble, Grenboble, France, (2)Institut de Physique du Globe, Paris, France, (3)Institut de Physique du Globe de Paris, Paris, France, (4)NIED National Research Institute for Earth Science and Disaster Prevention, Tsukuba, Japan, (5)University of Tokyo, Bunkyo-ku, Japan
Abstract:
Probing the long-term processes of volcanic eruption preparation and the short-term initiation and transport of magma to surface remains extremely difficult. One reason is that it is hardly possible to directly monitor at depth the magma storage areas. One way to overcome this limit is to use seismic waves that, through their propagation, directly sample the targets of interest. This presentation will summarize recent advances and perspectives in characterizing volcanic systems using noise-based seismic monitoring. In particular, we will focus on Piton de la Fournaise volcano where a wide variety of processes including long-term magma pressure buildup, flank deformation, environmental perturbations and short-term eruption preparation are imaged. We will also show an example in Japan where mapping the seismic velocity susceptibility to transient stress perturbations allows characterizing the state of pressurized volcanic systems. We will discuss the perspectives of noise-based 4-D tomography that will be made possible in the future thanks to the availability of dense seismic networks including large-N arrays and intensive computational facilities.
