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Seismic evidence for asthenospheric updoming beneath the western Bohemian Massif, central Europe
Author(s) -
Heuer B.,
Geissler W. H.,
Kind R.,
Kämpf H.
Publication year - 2006
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2005gl025158
Subject(s) - massif , geology , seismology , geochemistry , earth science
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, CO 2 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 km 2 , gives evidence for local asthenospheric updoming and/or a confined body of partial melt, which might be the cause for high CO 2 mantle fluid flow and earthquake swarm activity in this recently nonvolcanic, intracontinental rift area.