Localisation of the propagating magma prior to the January 2010 Piton de la Fournaise eruption

Localisation of the propagating magma prior to the January 2010 Piton de la Fournaise eruption

Left hand side: Inversion results for n = 1, Q = 170, f = 10 Hz and b = 1 km s−1 . The top three panels show the results of the inversion in terms of depth (above sea level), Easting and Northing. For each component, the black curve represents the best position of the minimum misfit and both grey curves represent the minimum and maximum extension of a volume including misfit values inferior to 10% of the minimum misfit (see auxiliary material for an animation of the migrating 10% ellipsoid above the minimum misfit, and 3‐ D representation of the misfit). The bottom panel represents the raw ground velocity at station UV05 for timing comparison. Vertical dashed lines represent the beginning of the seismic swarm (07:54 AM) and the onset of the eruption (10:25 AM). The black stars show the location of the eruptive fissure.

Right hand side: Time evolution of the 3D misfit function (equation 5), small values (best location) are in red and high values in blue (saturation of the misfit function at 5 times the minimum value). The bottom-right panel represents the 3D surface that includes values smaller than 10% more than the minimum value of the misfit function. Also shown the localisation and name of the seismic stations used, and the location of the actual eruptive fissure in red.

References: 

B. Taisne, F. Brenguier, N. M. Shapiro, V. Ferrazzini, Imaging the dynamics of magma propagation using radiated seismic intensity, GEOPHYSICAL RESEARCH LETTERS, VOL. 38, L04304, doi:10.1029/2010GL046068, 2011