Dynamics of Piton de la Fournaise volcano observed by passive image interferometry with multiple references

A long-term increase in seismic velocities, averaging about 0.25% per year, has been identified at Piton de la Fournaise (PdF) volcano using passive image interferometry with multiple references. This trend is superimposed by short-term changes linked to summit seismo-tectonic earthquakes, indicating the influence of volcanic activity. Post-eruptive deflation periods show increased velocities associated with subsidence, while pre-eruptive inflation phases exhibit decreasing velocities. Seismic crises can correspond to either increasing or decreasing velocity depending on whether magma movement leads to deflation (due to eruption) or inflation (non-eruptive intrusion). The study suggests that these velocity changes reflect the dynamics of a shallow magma reservoir rather than surface eruptions, with the strongest effects observed in the central summit area. The research utilized 2010 and 2011 data from a network of 21 seismic stations to investigate these phenomena.

Sens-Schönfelder, C., Pomponi, E., & Peltier, A. (2014). Dynamics of Piton de la Fournaise volcano observed by passive image interferometry with multiple references. Journal of Volcanology and Geothermal Research, 276, 32–45. https://doi.org/10.1016/j.jvolgeores.2014.02.012