Rayleigh wave phase velocities and upper mantle structure in the Apennines

[摘要] The dispersion of the phase velocities of the surface Rayleigh
waves on the path between the station pair Torino-L'Aquila in the
Apennines has been observed with long period seismic stations for twin
earthquakes.
The inversion was provided by the "Hedgehog" program of non-linear
inversion analysis.
The interpretation supports the notion that in the Apennines low-velocity
material in the mantle is found within a few km of the Moho and may
lie immediately below the Moho; however the alternative model of a highvelocity
lid and very low-velocity channel cannot be completely rejected.