Seismic evidence for asthenospheric updoming beneath the western Bohemian Massif, central Europe

Details Seismic evidence for asthenospheric updoming beneath the western Bohemian Massif, central Europe Seismic evidence for asthenospheric updoming beneath the western Bohemian Massif, central Europe

Mar 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3305311h&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 5, CiteID L05311

Physics

18

Seismology: Continental Crust (1219), Seismology: Lithosphere (1236), Tectonophysics: Continental Tectonics: General (0905), Tectonophysics: Dynamics Of Lithosphere And Mantle: General (1213), Geographic Location: Europe

Scientific paper

Detailed images of the lithosphere beneath the western Bohemian Massif were obtained by analysis of more than 8500 P receiver functions. At the intersection of Regensburg-Leipzig-Rostock zone and Eger Rift, crustal thickness decreases to 26 km from approx. 31 km in the surroundings. The receiver functions display a positive phase at about 6 s delay time and a strong negative phase at 7 to 8 s, which coincides with an area of Moho updoming, CO2 mantle-derived degassing and earthquake swarm activity. These phases can be modeled by a velocity increase at 50 km and a velocity decrease at 65 km depth. The velocity decrease, observed over an area of 5300 km2, gives evidence for local asthenospheric updoming and/or a confined body of partial melt, which might be the cause for high CO2 mantle fluid flow and earthquake swarm activity in this recently nonvolcanic, intracontinental rift area.

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