This is a presentation of colleagues from the

Masaryk 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 teaching

Jana

Romana

Jan

Petr

some 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 seismicity

Max. 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 grid

layered loess/red-brown silt

loam – resedimented upper loess? (Holocene)

relic of paleosol11.94±0.17 ky

(14C)

loess + colluvia

OSL datings not available yet, assumed age of top loess: last glacial

160+ cm slip on this young normal fault!(Primary tectonic origin + creep-like response of the slope.)