Open AccessTemporal changes in seismic wave propagation towards the end of the 2002 Mt Etna eruption
Author(s) -
Zaccarelli L.,
Pandolfi D.,
Bianco F.,
Saccorotti G.,
Bean C. J.,
Pezzo E. Del
Publication year - 2009
Publication title -
geophysical journal international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.302
H-Index - 168
eISSN - 1365-246X
pISSN - 0956-540X
DOI - 10.1111/j.1365-246x.2009.04219.x
Subject(s) - geology , seismology , seismic interferometry , volcano , coda , seismic anisotropy , seismic wave , p wave , anisotropy , wave propagation , geophysics , interferometry , mantle (geology) , medicine , physics , quantum mechanics , astronomy , cardiology , atrial fibrillation
SUMMARY Stress can undergo rapid temporal changes in volcanic environments, and this is particularly true during eruptions. We use two independent methods, coda wave interferometry (CWI) and shear wave splitting (SWS) analysis to track stress related wave propagation effects during the waning phase of the 2002 NE fissure eruption at Mt Etna. CWI is used to estimate temporal changes in seismic wave velocity, while SWS is employed to monitor changes in elastic anisotropy. We analyse seismic doublets, detecting temporal changes both in wave velocities and anisotropy, consistent with observed eruptive activity. In particular, syn‐eruptive wave propagation changes indicate a depressurization of the system, heralding the termination of the eruption, which occurs three days later.