Publication Date:
2017-05-10
Description:
In this work, we integrate artificial and natural seismic sources data to obtain high-resolution images of the shallow inner structure of Stromboli volcano. Overall, we used a total of 21,953 P readings from an active seismic experiment and an additional 2,731 P and 992 S readings deriving from 269 local events. The well-defined Vp, Vs and Vp/Vs tomograms have highlighted: i) the region where magma cumulates at shallow depths (2-4 km b.s.l.), forming an elongated NE-SW high velocity body (Vp ≥ 6.0 km/s and Vs ≥ 3.5 km/s), with a very fast velocity core (6.5 ≤ Vp 〈 7.0 km/s) of ~ 2 km 3 ; ii) the presence of some near-vertical pipe-like structures, characterized by relatively high P-velocities values, mainly linked to past activity (e.g. Strombolicchio) and iii) a near-vertical pipe like volume with high Vp/Vs (1.78÷1.85), located beneath to the craters (down to ~ 1.0 km b.s.l.), overlying a deeper region (1.0 to 3.0 km b.s.l.) with low Vp/Vs (1.64÷1.69), interpreted as the actual and preferential pathway of magma toward the surface. Our results demonstrate the importance of combining passive and active seismic data to improve, in a tomographic inversion, the resolution of the volcanic structures and to discover where magma may be stored.
Print ISSN:
0094-8276
Electronic ISSN:
1944-8007
Topics:
Geosciences
,
Physics
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