Three-dimensional P-wave velocity structure of Mt. Etna, Italy

Details Three-dimensional P-wave velocity structure of Mt. Etna, Italy Three-dimensional P-wave velocity structure of Mt. Etna, Italy

Jun 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998georl..25.1975v&link_type=abstract

Geophysical Research Letters, Volume 25, Issue 11, p. 1975-1978

Physics

26

Seismology: Volcano Seismology, Tectonophysics: Tomography

Scientific paper

The 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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