End of subduction in northern Apennines confirmed by observations of quasi-Love waves from the great 2004 Sumatra-Andaman earthquake

Details End of subduction in northern Apennines confirmed by observations of quasi-Love waves from the great 2004 Sumatra-Andaman earthquake End of subduction in northern Apennines confirmed by observations of quasi-Love waves from the great 2004 Sumatra-Andaman earthquake

Feb 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3404304l&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 4, CiteID L04304

Physics

8

Seismology: Surface Waves And Free Oscillations, Tectonophysics: Dynamics Of Lithosphere And Mantle: General (1213), Tectonophysics: Subduction Zone Processes (1031, 3060, 3613, 8413)

Scientific paper

Surface waves from the great Sumatra-Andaman earthquakes of 2004 and 2005 that cross Italy south of ~44°N display Love-to-Rayleigh scattered waves (quasi-Love phases) diagnostic of sharp lateral gradients in the anisotropic properties of Earth's upper mantle. Surface waves that traverse Italy further north lack this distinctive phase, documenting a change in the upper mantle fabric that is corroborated by a shift in the fast polarization of shear wave birefringence. These observations suggest that orogen-parallel asthenospheric extension behind the retreating Apennines slab has limited geographical expression. We hypothesize that subduction rollback currently terminates at 44°N, while the upper mantle flow pattern further to the north has been recently rearranged.

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