Location of the Carlsberg Fault zone from seismic controlled-source fan recordings

Details Location of the Carlsberg Fault zone from seismic controlled-source fan recordings Location of the Carlsberg Fault zone from seismic controlled-source fan recordings

Apr 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3107621n&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 7, CiteID L07621

Physics

3

Seismology: Body Wave Propagation, Seismology: Instruments And Techniques, Structural Geology: Fractures And Faults

Scientific paper

We locate the concealed Carlsberg Fault zone in the city of Copenhagen from seismic fan recordings. The fault is part of a fault system close to the border between the Danish Basin and the Baltic Shield. Recent earthquakes indicate that this area is tectonically active. The fault zone is a seismic low-velocity zone. Fan shots were recorded on three receiver arrays (1.5-2.4 km long arcs) across the fault. Sources were placed inside and up to ~500 m away from the ~400-700 m wide fault zone at offsets of up to ~7 km. Shots inside the fault zone show: 1) weak, delayed first arrivals inside the fault zone; 2) stronger first arrivals outside the fault zone; 3) guided waves inside the fault zone. The fault is a shadow zone for shots detonated outside the fault zone. Our approach facilitates fault mapping in densely urbanized areas where seismic profiling is not feasible.

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