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The appearance of seismic activity after construction and filling of a water reservoir has been observed in many places around the world, including localities considered to be formerly aseismic. Occurrence and intensity of these earthquakes are determined by water reservo- irs' parameters, filling and discharging states and by local geological conditions and regional tectonic stress. The thesis firstly deals with two of the world's known significant hydroseis- micity examples and described is also seismicity in Nový Kostel area. The different types of hydroseismicity are thoroughly described along with all the major differences from ordinary earthquakes. The thesis further explains how water reservoirs may affect conditions important for earthquake occurrence such as hydrostatic pressure increase, pore pressure increase, and groundwater flow. These influences are related to water level fluctuations and therefore are described methods to analyze the relationship between earthquake occurrence and water level changes. Classical methods of crosscorrelation and frequency analysis are explained as well as not so common method of SSA (Singular Spectral Analysis). In the last section are all of these methods listed above applied to seismic data from the Nový Kostel area and water level measurements from... |
