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In this study, we apply the double-difference tomography to investigate thedetailed 3-D structure within and around the Nový Kostel Seismic Zone, anarea in the Czech Republic known for frequent occurrences of earthquakeswarms. We use data from the 2008 swarm since it has already been analysed interms of earthquake focal mechanisms, principal faults, tectonic stress andfoci migration. We selected about 500 microearthquakes recorded at 22 localseismic stations of the West Bohemiaseismic monitoring network (WEBNET). Applyingdouble-difference tomography, combined with weighted average model (WAM)post-processing to correct for parameter dependence effects, we produce andinterpret 3-D models of the Vp-to-Vs ratio (Vp/Vs) in and around thefocal zone. The modelled Vp/Vs ratio shows several distinctstructures, namely an area of high Vp/Vs ratio correlating with thefoci of the microearthquakes, and a layer of low values directly above it.These structures may reflect changes in lithology and/or fluid concentration.The overlaying low Vp/Vs ratio layer coincides with the base of theFichtelgebirge (Smrčiny) granitic intrusion. It is possible that the baseof the layer acts as a fluid trap and an upper limit to the seismicity,resulting in observed periodic swarms

Velocity structure and the role of fluids in the West Bohemia Seismic Zone