Abstract
The West Bohemia/Vogtland region in the western part of the Bohemian Massif, known for periodic occurrence of earthquake swarms, is also characterised by 0.2–0.5Ma old Quaternary volcanoes, rich CO2 emissions, anomalies of mantle-derived He, mineral springs and moffets. The detailed analysis of the time-space pattern of seismicity during the January 1997 swarm demonstrates the gradual and ordered migration of micro-seismic activity, suggesting the step-by-step penetration of fluids into a small fractured volume. This scenario is supported by the similarity of the source mechanisms of the natural events of the January 1997 swarm with artificial injection-induced micro-earthquakes during the German deep drilling project (KTB) in neighbouring NE Bavaria. Also the comparison of the West Bohemia/Vogtland earthquake swarm region with other intraplate earthquake swarm regions and with earthquake swarms induced by current volcanic processes indicates a role of intrusions of magma and related fluids in generation process of earthquake swarms.
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