The seismotectonics of western Skagerrak |
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| Authors: | Mathilde Bøttger Sørensen Peter H Voss Jens Havskov Søren Gregersen Kuvvet Atakan |
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| Institution: | 1.Department of Earth Science,University of Bergen,Bergen,Norway;2.Geological Survey of Denmark and Greenland - GEUS,Copenhagen K,Denmark |
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| Abstract: | The seismically active Skagerrak region in the border area between Denmark and Norway has traditionally been associated with
uncertain earthquake locations due to the limited station coverage in the region. A new seismic station in southern Norway
and a recent update of the earthquake database of the Danish National Network have led to a much more complete and homogeneous
data coverage of the Skagerrak area, giving the possibility of improved earthquake locations in the region. In this study,
we relocate earthquakes in the Skagerrak area to obtain a more exact picture of the seismicity and investigate well-recorded
events to determine the depth distribution. Hypocenter depths are found to be generally in the range 11–25 km. Furthermore,
new composite focal mechanisms are determined for clusters of events with similar waveforms. Results indicate that the Skagerrak
seismicity is associated with shallow, crustal faults oriented in the NS direction south of the Sorgenfrei–Tornquist Zone
(STZ) as well as with the STZ itself. Mainly reverse faulting mechanisms along NE–SW oriented faults indicate maximum horizontal
compression in the NW–SE direction. This is in agreement with World Stress Map generalizations, most likely associated with
ridge push forces from the mid-Atlantic ridge, though modified probably by local crustal weaknesses. |
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