In ambient noise interferometry (ANI), ubiquitous ambient noise signals are capitalized on to probe the subsurface of the Earth for temporal changes in seismic velocity. Previous studies have applied ANI to seismic data recorded at active volcanic systems and have identified volcanic activity such as pre-eruption inflation, eruption onset, and co-eruptive deformation. For this reason, ANI has become a methodology of great interest to volcano observatories worldwide. However, retrospective ANI studies have the advantage of knowing when a particular volcanic event was observed (e.g. onset of an eruption), allowing the investigators to mine that time window of seismic data for changes in seismic velocity that occurred contemporaneously.
|Last updated||Key Points|