he three‐dimensional P‐wave velocity structure of Mt. Etna is determined to depths of 15 km by tomographic inversion of first arrival times from local earthquakes recorded by a network of 29 permanent and temporary seismographs. Results show a near‐vertical low‐velocity zone that extends from beneath the central craters to a depth of 10 km. This low‐velocity region is coincident with a band of steeply‐dipping seismicity, suggesting a magmatic conduit that feeds the summit eruptions. The most prominent structure is an approximately 8‐km‐diameter high‐velocity body located between 2 and 12 km depth below the southeast flank of the volcano. This high‐velocity body is interpreted as a remnant mafic intrusion that is an important structural feature influencing both volcanism and east flank slope stability and faulting
Three-dimensional P-wave velocity structure of Mt. Etna, Italy
VINCIGUERRA, Sergio Carmelo
1998-01-01
Abstract
he three‐dimensional P‐wave velocity structure of Mt. Etna is determined to depths of 15 km by tomographic inversion of first arrival times from local earthquakes recorded by a network of 29 permanent and temporary seismographs. Results show a near‐vertical low‐velocity zone that extends from beneath the central craters to a depth of 10 km. This low‐velocity region is coincident with a band of steeply‐dipping seismicity, suggesting a magmatic conduit that feeds the summit eruptions. The most prominent structure is an approximately 8‐km‐diameter high‐velocity body located between 2 and 12 km depth below the southeast flank of the volcano. This high‐velocity body is interpreted as a remnant mafic intrusion that is an important structural feature influencing both volcanism and east flank slope stability and faulting
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