Nonlinear P-wave tomography of subducted lithosphere beneath central-southern Apennines (Italy)

Details Nonlinear P-wave tomography of subducted lithosphere beneath central-southern Apennines (Italy) Nonlinear P-wave tomography of subducted lithosphere beneath central-southern Apennines (Italy)

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28.4387c&link_type=abstract

Geophysical Research Letters, Volume 28, Issue 23, p. 4387-4390

Physics

Geophysics

10

Mathematical Geophysics, Seismology: Body Wave Propagation, Seismology: Lithosphere And Upper Mantle, Tectonophysics: Tomography

Scientific paper

We present new tomographic images for the P-wave velocity structure in the upper mantle beneath central-southern Apennines down to 510 km depth. The model is computed by nonlinear inversion of relative arrival times of both direct and secondary teleseismic phases, handpicked from over 2800 waveforms recorded by the Italian seismic network during 1988-2000. Beneath central Apennines, the images reveal a continuous, SW-dipping high-velocity body, from ~ 150 km down to ~ 500 km. At shallower depths, a pronounced low-velocity zone is recognized from the uppermost mantle beneath the Apenninic belt down to ~ 200 km below the Tyrrhenian area. This feature is proposed to affect the seismic structure of the downgoing slab, weakening its velocity signature. Beneath southern Apennines, high-velocity anomalies are reconstructed in the uppermost mantle of the Apulian foreland and below the belt in the range 100÷400km. Low-velocity regions, interpreted as due to asthenospheric upwelling, are recovered above or across the fast structures, as at the southeastern end of the Apennines where a possible complete slab breakoff is suggested.

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