We locate the concealed Carlsberg Fault zone along a 12-km-long trace
in the Copenhagen city centre by seismic refraction, reflection and
fan profiling. The Carlsberg Fault is located in a NNW-SSE striking
fault system in the border zone between the Danish Basin and the
Baltic Shield. Recent earthquakes indicate that this area is tectonically
active. A seismic refraction study across the Carlsberg Fault shows
that the fault zone is a low-velocity zone and marks a change in
seismic velocity structure. A normal incidence reflection seismic
section shows a coincident flower-like structure. We have recorded
seismic signals in a fan geometry from shots detonated both inside
the low-velocity fault zone and up to \~500 m away from the fault
zone. The seismic energy was recorded on three receiver arrays (1.5-
to 2.4-km-long arcs) across the expected location of the \~400-
to 700-m-wide fault zone at distances of up to \~7 km from the
shots. Shots detonated inside the fault zone result in (1) weak and
delayed first arrivals on the receivers located inside the fault
zone compared to earlier and stronger first arrivals outside the
fault zone; (2) strong guided P and S waves as well as surface waves
inside the fault zone. The fault zone is a shadow zone to shots detonated
outside the fault zone. Finite-difference wavefield modelling supports
the interpretations of the fan recordings. Our fan recording approach
facilitates cost-efficient mapping of fault zones in densely urbanized
areas where seismic normal incidence and refraction profiling are
not feasible.
%0 Journal Article
%1 nielsen_etal:2005
%A Nielsen, Lars
%A Thybo, Hans
%A Jørgensen, Mette I.
%C Gelogical Institute, University of Copenhagen, Denmark. E-mail: ln@geol.ku.dk
%D 2005
%J Geophysical Journal International
%K geophysics seismics
%N 2
%P 461--478
%R 10.1111/j.1365-246X.2005.02664.x
%T Integrated seismic interpretation of the Carlsberg Fault zone, Copenhagen,
Denmark
%U http://dx.doi.org/10.1111/j.1365-246X.2005.02664.x
%V 2
%X We locate the concealed Carlsberg Fault zone along a 12-km-long trace
in the Copenhagen city centre by seismic refraction, reflection and
fan profiling. The Carlsberg Fault is located in a NNW-SSE striking
fault system in the border zone between the Danish Basin and the
Baltic Shield. Recent earthquakes indicate that this area is tectonically
active. A seismic refraction study across the Carlsberg Fault shows
that the fault zone is a low-velocity zone and marks a change in
seismic velocity structure. A normal incidence reflection seismic
section shows a coincident flower-like structure. We have recorded
seismic signals in a fan geometry from shots detonated both inside
the low-velocity fault zone and up to \~500 m away from the fault
zone. The seismic energy was recorded on three receiver arrays (1.5-
to 2.4-km-long arcs) across the expected location of the \~400-
to 700-m-wide fault zone at distances of up to \~7 km from the
shots. Shots detonated inside the fault zone result in (1) weak and
delayed first arrivals on the receivers located inside the fault
zone compared to earlier and stronger first arrivals outside the
fault zone; (2) strong guided P and S waves as well as surface waves
inside the fault zone. The fault zone is a shadow zone to shots detonated
outside the fault zone. Finite-difference wavefield modelling supports
the interpretations of the fan recordings. Our fan recording approach
facilitates cost-efficient mapping of fault zones in densely urbanized
areas where seismic normal incidence and refraction profiling are
not feasible.
@article{nielsen_etal:2005,
abstract = {We locate the concealed Carlsberg Fault zone along a 12-km-long trace
in the Copenhagen city centre by seismic refraction, reflection and
fan profiling. The Carlsberg Fault is located in a NNW-SSE striking
fault system in the border zone between the Danish Basin and the
Baltic Shield. Recent earthquakes indicate that this area is tectonically
active. A seismic refraction study across the Carlsberg Fault shows
that the fault zone is a low-velocity zone and marks a change in
seismic velocity structure. A normal incidence reflection seismic
section shows a coincident flower-like structure. We have recorded
seismic signals in a fan geometry from shots detonated both inside
the low-velocity fault zone and up to \~{}500 m away from the fault
zone. The seismic energy was recorded on three receiver arrays (1.5-
to 2.4-km-long arcs) across the expected location of the \~{}400-
to 700-m-wide fault zone at distances of up to \~{}7 km from the
shots. Shots detonated inside the fault zone result in (1) weak and
delayed first arrivals on the receivers located inside the fault
zone compared to earlier and stronger first arrivals outside the
fault zone; (2) strong guided P and S waves as well as surface waves
inside the fault zone. The fault zone is a shadow zone to shots detonated
outside the fault zone. Finite-difference wavefield modelling supports
the interpretations of the fan recordings. Our fan recording approach
facilitates cost-efficient mapping of fault zones in densely urbanized
areas where seismic normal incidence and refraction profiling are
not feasible.},
added-at = {2012-09-01T13:08:21.000+0200},
address = {Gelogical Institute, University of Copenhagen, Denmark. E-mail: ln@geol.ku.dk},
author = {Nielsen, Lars and Thybo, Hans and J{\o}rgensen, Mette I.},
biburl = {https://www.bibsonomy.org/bibtex/2b12ed7478e57607b5aa2b27e56f56719/nilsma},
doi = {10.1111/j.1365-246X.2005.02664.x},
interhash = {a1bb5e25b542c22f21dd9d0c4f8ac757},
intrahash = {b12ed7478e57607b5aa2b27e56f56719},
issn = {1365-246X},
journal = {Geophysical Journal International},
keywords = {geophysics seismics},
month = aug,
number = 2,
pages = {461--478},
timestamp = {2021-02-09T13:27:42.000+0100},
title = {Integrated seismic interpretation of the Carlsberg Fault zone, Copenhagen,
Denmark},
url = {http://dx.doi.org/10.1111/j.1365-246X.2005.02664.x},
volume = 2,
year = 2005
}