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Nature of seismicity in the Hronov-Poříčí fault area

Grant No.: GA205/09/1244	Grant Agency: Czech Science Foundation (GAČR)
Resolved in: 2009 - 2013
Principal investigator: Mgr. Petr Kolínský, Department of Seismology, IRSM AS CR, v.v.i.	Co-investigators: Ing. Jaroslav Štrunc, PhD., Department of Seismology, IRSM AS CR, v.v.i. Mgr. Renata Gaždová, Department of Seismology, IRSM AS CR, v.v.i.
Description: Seismic activity and occurrence of mineral waters are observed in the Hronov-Porici fault area. Local seismicity effects on groundwater sources were observed in connection with strong 1901 north-eastern Bohemia earthquake, but the systematic observation started only in 2005. Due to installation of OST small-aperture array operating since that year, very weak microearthquakes from M > -2 are registered and localized. This weak seismic activity has swarm-like character. Four hypocentral zones were found. The former project was aimed at determination of local seismicity effects on groundwater level. Because a promising correlation of water level changes with seismic activity was found in case of several events and longer time series of data are needed, current project will continue with the underground water level observations as well as with seismic monitoring. Thanks to better localization of seismic events and high sensitivity of network, the present project can concentrate on special phenomena as very weak seismic swarms, non-volcanic tremors and migration of hypocenters. This will help us to understand the nature of local seismicity in this region.
ISVAV: (What is it?) Project in The Research and Development and Innovation System of the Czech Republic (in Czech only)