This is a presentation of colleagues from theMasaryk University Brno - Institute of Physics of the Earth presented by Peter Melichar

Institute of Physics of the Earthat Masaryk University Brno www.ipe.muni.cz 14 people - seismologists, geologists, engineers developing since 1981, joined with university in 1992 seismological monitoring, basic + applied research and teachingJanaRomanaJanPetrsome of us to be involved: J. Pazdirkova, R. Hanzlova, P. Spacek & J. Svancara the boss

3 networks of SP stations (green) for monitoring of local seismicity and nuclear power plants 4 broadband stations (red) - data for National Service and ZAMG, GEOFON, CTBTO, EMSC, ORFEUS, NEIC, ...

Our infrastructure

Seismicity extends from the Alpine-Carpathian/Panonian region (ALCAPA) to its foreland. The Bohemian Massif acts as a buffer zone of stable Europe.Only weak tectonic activity with locally increased seismicityMax. instrumental M=4.6 Max. historical I~7.5-8 instrumentally recorded events for period 2000-2009(the black/grey dots are Cenozoic anorogenic volcanics)

Some general ideas for the Bohemian Massif

the stress/strain transfer from the active parts of ALCAPA to the adjacent low-seismicity regions should be studied we have 2 nuclear power plants and growing community of seismic hazard sceptics around we need to re-evaluate catalogues should be revised and completed for earthquakes with long recurrence periods geological record must be used for that paleoseismology (see the first striking results of Czech and Austrian colleagues) information on fault slip rate needed - conventional geodesy indicates an active fault slip

Our activities and problems to be addressed:

instrumental seismic data, incl. strong motion data recording, processing, exchange (Romana, Jana) catalogue of instrumental events since 2000 incl. fakes (Jana) seismotectonic studies at ALCAPA/Bohemian Massif junction (all of us)? improvement of seismic station coverage (coop. with ZAMG?) completion of historical catalogues, joint catalogue for Central Europe? (Jana coop. w. Christa and others) paleoseismology and geological input into seismic hazard issues (Petr)? satellite geodesy PSInSAR (Petr would welcome help here no experience, cooperation needed)

Trenching the faults in the Boh. Massif an example(P. Spacek, 2013)

1x1m gridlayered loess/red-brown silt loam resedimented upper loess? (Holocene)relic of paleosol11.940.17 ky (14C)loess + colluviaOSL datings not available yet, assumed age of top loess: last glacial160+ cm slip on this young normal fault!(Primary tectonic origin + creep-like response of the slope.)

**upper part of main faulted segment of the profile exposed to the top of bedrock, at the footwall block the bedrock is creep deformed which may indicate slow relaxation of the tectonically controlled slope, anomalous loam, paleosol holocene/uppermost pleistocene. Datings not available yet, but the age of upper loess assumed to correspond to last glaciation by analogy with other localities.