A natural and controlled source seismic profile through the Eastern Alps: TRANSALP

Details A natural and controlled source seismic profile through the Eastern Alps: TRANSALP A natural and controlled source seismic profile through the Eastern Alps: TRANSALP

Aug 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004e%26psl.225..115k&link_type=abstract

Earth and Planetary Science Letters, Volume 225, Issue 1-2, p. 115-129.

Physics

25

Eastern Alps, Continent-Continent Collision, Receiver Functions

Scientific paper

The combined passive and active seismic TRANSALP experiment produced an unprecedented high-resolution crustal image of the Eastern Alps between Munich and Venice. The European and Adriatic Mohos (EM and AM, respectively) are clearly imaged with different seismic techniques: near-vertical incidence reflections and receiver functions (RFs). The European Moho dips gently southward from 35 km beneath the northern foreland to a maximum depth of 55 km beneath the central part of the Eastern Alps, whereas the Adriatic Moho is imaged primarily by receiver functions at a relatively constant depth of about 40 km. In both data sets, we have also detected first-order Alpine shear zones, such as the Helvetic detachment, Inntal fault and Sub-Tauern ramp in the north. Apart from the Valsugana thrust, receiver functions in the southern part of the Eastern Alps have also observed a north dipping interface, which may penetrate the entire Adriatic crust [Adriatic Crust Interface (ACI)]. Deep crustal seismicity may be related to the ACI. We interpret the ACI as the currently active retroshear zone in the doubly vergent Alpine collisional belt.

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