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Discussion papers | Copyright
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 24 Sep 2018

Research article | 24 Sep 2018

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Solid Earth (SE).

Event couple spectral ratio Q method for earthquake clusters: application to North-West Bohemia

Marius Kriegerowski1, Simone Cesca2, Matthias Ohrnberger1, Torsten Dahm1,2, and Frank Krüger1 Marius Kriegerowski et al.
  • 1University of Potsdam, Institute of Earth and Environmental Science, Karl-Liebknecht-Str. 24-25, 14476 Potsdam-Golm
  • 2Helmholtz Centre Potsdam German Research Centre for Geosciences - GFZ, Telegrafenberg, 14473 Potsdam

Abstract. We develop an amplitude spectral ratio method for event couples from clustered earthquakes to estimate seismic wave attenuation (Q−1) in the source volume. The method allows to study attenuation within the source region of earthquake swarms or aftershocks at depth, independent of wave path and attenuation between source region and surface station. We exploit the high frequency slope of phase spectra using multitaper spectral estimates. The method is tested using simulated full wavefield seismograms affected by recorded noise and finite source rupture. The synthetic tests verify the approach and show that solutions are independent of focal mechanisms, but also show that seismic noise may broaden the scatter of results. We apply the event couple spectral ratio method to North-West Bohemia, Czech Republic, a region characterized by the persistent occurrence of earthquake swarms in a confined source region at mid-crustal depth. Our method indicates a strong anomaly of high attenuation in the source region of the swarm with an averaged attenuation factor of Qp<100. The application to S phases fails due to scattered P phase energy interfering with S phases. The Qp anomaly supports the common hypothesis of highly fractured and fluid saturated rocks in the source region of the swarms in North-West Bohemia. However, high temperatures in a small volume around the swarms cannot be excluded to explain our observations.

Marius Kriegerowski et al.
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Marius Kriegerowski et al.
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Publications Copernicus
Short summary
We developed a method that allows to estimate the acoustic attenuation of seismic waves within regions with high earthquake source densities. Attenuation is of high interest as it allows to draw conclusions on the origin of seismic activity. We apply our method to North-West Bohemia which is regularly affected by earthquake swarms during which thousand of earthquakes are registered within few days. We find reduced attenuation within the active volume which may indicate high fluid content.
We developed a method that allows to estimate the acoustic attenuation of seismic waves within...