Biagioli F., Métaxian Jean-Philippe, Stutzmann E., Ripepe M., Bernard P., Trabattoni A., Longo R., Bouin M. P. (2023). Array analysis of seismo-volcanic activity with distributed acoustic sensing. Geophysical Journal International, 236 (1), p. 607-620. ISSN 0956-540X.
Titre du document
Array analysis of seismo-volcanic activity with distributed acoustic sensing
Biagioli F., Métaxian Jean-Philippe, Stutzmann E., Ripepe M., Bernard P., Trabattoni A., Longo R., Bouin M. P.
Source
Geophysical Journal International, 2023,
236 (1), p. 607-620 ISSN 0956-540X
Continuous seismic monitoring of volcanoes is challenging due to harsh environments and associated hazards. However, the investigation of volcanic phenomena is essential for eruption forecasting. In seismo-volcanic applications, distributed acoustic sensing (DAS) offers new possibilities for long-duration surveys. We analyse DAS strain rate signals generated by volcanic explosions and tremor at Stromboli volcano (Italy) recorded along 1 km of dedicated fibre-optic cable. We validate DAS recordings with colocated nodal seismometers. Converting node measurements to strain rate, we observe a perfect match in phase between DAS and node waveforms. However, DAS amplitudes appear to be around 2.7 times smaller than those of node records, which we explain as due to the inefficient ground-to-fibre strain transfer in the loose cable. We invert time delays between strain rate waveforms and confirm that the DAS enables us to retrieve a dominant and persistent seismic source in the proximity of active craters. This stable source location is confirmed by node array analyses. Despite an observed high noise level of strain rate signals outside a range of 2-15 Hz, our results demonstrate the potential of this new technology in monitoring volcanic areas.
Plan de classement
Sciences fondamentales / Techniques d'analyse et de recherche [020]
;
Géophysique interne [066]
