Abstract
A two-dimensional active seismic experiment was performed on Mount
Vesuvius: Explosive charges were set off at three sites, and the
seismic signal along a dense line of 82 seismometers was recorded.
A high-velocity basement, formed by Mesozoic carbonates, was identified
2 to 3 kilometers beneath the volcano. A slower (P-wave velocity
VP 3.4 to 3.8 kilometers per second) and shallower high-velocity
zone underlies the central part of the volcano. Large-amplitude late
arrivals with a dominant horizontal wave motion and low-frequency
content were identified as a P to S phase converted at a depth of
about 10 kilometers at the top of a low-velocity zone (VP < 3 kilometers
per second), which might represent a melting zone. 10.1126/science.274.5287.592
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