Jana Pazdírková

Zvýšená seismická aktivita v epicentrální oblasti Lašťany(střední Morava)

Weak natural seismic activity is known from the NE part of the Bohemian Massif. More than 2 200 tectonic events were recorded in this region on the basis of records of seismic stations operated by Institute of Physics of the Earth (IPE) during period 1996–2011. Since 2008 a relatively signifi cant seismic activity has been observed in epicentral area Lasťany situated SE of Sternberk. In this area, 221 tectonic events were observed during period September 2008 – December 2011. Local magnitude of strongest event reached value 2.

VÝJIMEČNÉ ZEMĚTŘESENÍ JV. OD POZNANĚ (POLSKO) ZAZNAMENANÉ 6. 1. 2012

On January 6, 2012, a moderate earthquake was observed in a region SE of Poznan (local magnitude ML = 3.6 according to Institute of Physics of the Earth, IPE). In this region, there haven‘t been known any historical earthquakes so far, and no natural seismic activity has been observed up to present. Similar rare occurrences of weak and moderate earthquakes were observed in a region near Kaliningrad in 2004 (sequence of events, local magnitude of strongest event being 5.0) and in south Moravia region near Znojmo in 2000 (local magnitude ML = 2.5). These facts show that even in seismically quiet regions occurence of weak to moderate seismic events (with value of magnitude ranging from 3 to 5) could be expected.