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    Seismic wave attenuation from borehole and surface records in the top 2.5 km beneath the city of Basel, Switzerland

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    Geophys. J. Int.-2012-Bethmann-1257-70.pdf
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    Type
    Article
    Authors
    Bethmann, Falko
    Deichmann, Nicholas
    Mai, Paul Martin cc
    KAUST Department
    Computational Earthquake Seismology (CES) Research Group
    Earth Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2012-06-27
    Online Publication Date
    2012-06-27
    Print Publication Date
    2012-08
    Permanent link to this record
    http://hdl.handle.net/10754/554372
    
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    Abstract
    We investigate attenuation (Q−1) of sediments of 2.5–3.5km thickness underneath the city of Basel, Switzerland. We use recordings of 195 induced events that were obtained during and after the stimulation of a reservoir for a Deep Heat Mining Project in 2006 and 2007. The data set is ideally suited to estimate Q as all events are confined to a small source volume and were recorded by a dense surface network as well as six borehole sensors at various depths. The deepest borehole sensor is positioned at a depth of 2.7km inside the crystalline basement at a mean hypocentral distance of 1.8km. This allows us to measure Q for frequencies between 10 and 130 Hz. We apply two different methods to estimate Q. First, we use a standard spectral ratio technique to obtain Q, and as a second measure we estimate Q in the time domain, by convolving signals recorded by the deepest sensor with a Q operator and then comparing the convolved signals to recordings at the shallower stations. Both methods deliver comparable values for Q. We also observe similar attenuation for P- and S- waves (QP∼QS). As expected, Q increases with depth, but with values around 30–50, it is low even for the consolidated Permian and Mesozoic sediments between 500 and 2700 m.
    Citation
    Seismic wave attenuation from borehole and surface records in the top 2.5 km beneath the city of Basel, Switzerland 2012, 190 (2):1257 Geophysical Journal International
    Publisher
    Oxford University Press (OUP)
    Journal
    Geophysical Journal International
    DOI
    10.1111/j.1365-246X.2012.05555.x
    Additional Links
    http://gji.oxfordjournals.org/cgi/doi/10.1111/j.1365-246X.2012.05555.x
    ae974a485f413a2113503eed53cd6c53
    10.1111/j.1365-246X.2012.05555.x
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Earth Science and Engineering Program

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