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Seismological evidence for a very sharp Sorgenfrei-Tornquist Zone in southern Sweden

Published online by Cambridge University Press:  01 September 1997

RAINER KIND ,
SØREN GREGERSEN ,
WINFRIED HANKA  and
GÜNTER BOCK
RAINER KIND
Affiliation:
GeoForschungsZentrum, Telegrafenberg, 14473 Potsdam, Germany
SØREN GREGERSEN
Affiliation:
Kort-og Matrikelstyrelsen, Rentemestervej 8, 2400 København, Denmark
WINFRIED HANKA
Affiliation:
GeoForschungsZentrum, Telegrafenberg, 14473 Potsdam, Germany
GÜNTER BOCK
Affiliation:
GeoForschungsZentrum, Telegrafenberg, 14473 Potsdam, Germany
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Abstract

A passive seismological experiment across the northern boundary of the Tornquist Fan was carried out from December 1994 until April 1995 along a 100 km long profile in Denmark and Sweden. Observed PS converted seismic waves indicate an abrupt increase in Moho depth of 4–5 km within 5 km horizontal distance at about 50 km to the northeast of the Øresund. This is a much sharper jump than that inferred from the wide-angle data of EUGENO-S line 1. Preliminary analysis of seismic shear wave anisotropy indicates asthenospheric mantle flow parallel to the Sorgenfrei-Tornquist Zone. These parallel directions are already observed between the Elbe Line and the Sorgenfrei-Tornquist Zone while further south in central Europe the flow directions follow the trend of the Alpine belt.

Type
Research Article
Information
Geological Magazine , Volume 134 , Issue 5 , September 1997 , pp. 591 - 595
Copyright
© 1997 Cambridge University Press

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