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Abstract
We assume a four layers stratified crustal model with homogeneous layers and spherical simmetry for the earth's crust of the Western Ionian basin like a similar crustal model formerly proposed for the Southern Tyrrenian basin and the Messina Straits area. To define the P-wave velocity in the upper layer of the model we analize the travel-times of the 7-waves produced by shots fired in the region concerned. Such waves are recorded in different and conveniently grouped seismic stations. The observed travel-times are essential to define the P-phase refracted at the base of the first crustal layer of the model and subsequently the following refracted phases. The thickness of the layers and the corrispondent velocities are calculated by determining the 8 / , and S A,- contributions (travel-time and angular distance) following the relation relative to the seismic parameter p{: S , a ; = 2 2, - S / , - 2 p i 2,8A,. where a, is the intercepted time of the observed travel-time curve. A similar procedure allows to define a crustal model also for S-waves. Finally the elastic constants p., K, rs and p density in the crustal layers are calculated.
Highlights
In October 1977 and until January 1978 the Royal Society Etna Research carried out a seismic array study on the Etna area in order to identify a possible anomalous propagation body identifiable with a magma chamber
The research was mainly based on the recording of seismic waves produced by four shots fired at the Ionian Sea and required the installation of a temporary seismic network made up of four sub-arrays with stations based in the North at Castiglione, in the East at Moscarelk», in the South at San Vito and in North-West at Cesarò
Veneretta and Orti stations were installed by the Messina University Geophysical Institute
Summary
In October 1977 and until January 1978 the Royal Society Etna Research carried out a seismic array study on the Etna area in order to identify a possible anomalous propagation body identifiable with a magma chamber. A refracttor horizon at the R* = 6355.5 Km level corresponds to the travel - t i m e curve of the P* with parameter p = 18.3104 sec - A - 1 a n d an intercept time a2 = 5.81 sec It follows that the thickness of the second layer is h2 = 10.8 Km, with a value of the true velocity of the P-waves below it v3 = (6.06 ± 0.15) Km sec-1.
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