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|Authors: ||Barberi, G.*|
De Gori, P.*
|Title: ||Time-resolved velocity tomography at Mount Etna (Italy) volcano during 2000-2008|
|Issue Date: ||17-Apr-2012|
|Keywords: ||Mt. Etna|
|Abstract: ||The continuous volcanic and seismic activity at Mount Etna makes this volcano an important laboratory for seismological and geophysical studies. We used repeated three-dimensional tomography (4D tomography) to detect variations in elastic parameters during different volcanic cycles in the period November 2000–May 2008, that includes several flank eruptions.
The use of a large number of permanent seismic stations and the abundance of local earthquakes, occurring both before and during the eruptions, guarantee consistent and high-resolution velocity models. First, we performed a tomographic inversion of the whole data set to define the 3D P-wave velocity (VP) and the structure of the P- to S-wave velocity ratio (VP/VS). A total of ca. 3,000 well constrained earthquakes (root mean square time residuals ≤ 0.4 s; horizontal and vertical hypocentral location errors ≤ 1.5 km; azimuthal gap of the stations ≤ 180°), ca. 40,000 P-wave arrivals, and ca. 9,000 S-wave arrivals were inverted to model a grid, 2 km by 2 km by 1 km spaced, with the use of SIMULPS-14 software. Then, on the basis of geophysical and geochemical observations indicating some cyclic recharging and discharging (eruptions) phases, we inverted different sub-periods to investigate time variations in the elastic parameters.
The observed time changes of velocity-oriented anomalies suggest that four-dimensional tomography could provide a basis for more efficient volcano monitoring and short- and midterm eruption forecasting.|
|Appears in Collections:||Conference materials|
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