P-wave deep velocity structure of the Southern Tyrrhenian Subduction Zone from nonlinear teleseismic traveltime tomography

Details P-wave deep velocity structure of the Southern Tyrrhenian Subduction Zone from nonlinear teleseismic traveltime tomography P-wave deep velocity structure of the Southern Tyrrhenian Subduction Zone from nonlinear teleseismic traveltime tomography

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.3709c&link_type=abstract

Geophysical Research Letters, Volume 26, Issue 24, p. 3709-3712

Physics

Geophysics

16

Mathematical Geophysics: Inverse Theory, Seismology: Lithosphere And Upper Mantle, Tectonophysics: Tomography

Scientific paper

A new 3-D model for the P-wave velocity structure of the Southern Tyrrhenian Subduction Zone (STSZ) is determined from nonlinear inversion of relative arrival times of teleseismic events. The data used in the imaging are the travel time residuals of both direct, P and PKPdf, and secondary pP,sP,PcP,PKPbc phases, computed with respect to the global 1-D velocity model ak135. 2308 teleseismic waveforms were collected for this study from 109 events recorded by the Italian National Seismic Network (RSNC) during 1988-1998. The velocity perturbation field is reconstructed gradually by means an iterative sequence of linearized inversions, incorporating a 3-D minimum travel time ray tracing. The tomographic images reveal a broad high-velocity zone dominating the pattern of lateral variations beneath the Southern Tyrrhenian Sea and Calabria. This fast structure extends laterally for a maximum of ~350 km, from northern Sicily to southern Campania, and vertically for at least 400 km, from the uppermost mantle down to 500 km depth. Below 350 km the geometry of the depicted slab is characterized by horizontal deflection of the subducting lithosphere towards the central Tyrrhenian basin.

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