Abstract
In addition to the previously processed set of 91 events from year 2008 seismic swarm from West Bohemian region (Czech Rep.), we investigated another 368 events, i.e. 454 events in total (M L 0.1–3.8). We determined parameters of a finite source model by stopping-phases method, namely, source radius and rupture velocity. Newly, the methodology was amended by applying a correction for the effect of attenuation; this effect was found to have an ineligible influence on the results, especially for weaker events (M L < 1.2). The results are presented both in numerical and in graphical form. From the determined source parameters, we again estimated stress drops of processed events—the results confirm a hypothesis about constant stress drop (with the mean value being 2.9 ± 1.3 MPa). Even if a newly implemented correction for the effect of attenuation decreases the stress drop variation (especially for weaker events), the possibility of partial saturation still remains open. We also present an attempt of a 3D structure model of foci volume and speculate about possible sub-vertical structure in the foci area.
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Acknowledgments
We are thankful to Ms. A. Boušková for providing us with the WEBNET bulletin, to Ms. J. Doubravová for raw seismogram extraction, to V. Vavryčuk for providing us with the source mechanisms, to B. Růžek for consultation of inversion problems and to T. Fischer for help with event location.
Conflict of interest
The work was supported by the author’s home institution (Institute of Geophysics, Acad. of Sci., Czech Rep.). The author declares that there are no other conflicts of interest.
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Kolář, P. Estimation of parameters of finite seismic source model for selected event of West Bohemia year 2008 seismic swarm—methodology improvement and data extension. J Seismol 19, 935–947 (2015). https://doi.org/10.1007/s10950-015-9504-1
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DOI: https://doi.org/10.1007/s10950-015-9504-1