Micro-deformation monitoring of active tectonic structures in W Slovenia

Title:

Micro-deformation monitoring of active tectonic structures in W Slovenia

Creator:

Gosar, Andrej, Šebela, Stanka, Blahoslav Košťák, and Stemberk, Josef

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:418a6444-82fd-458e-8fcb-3bd20f70967a
uuid:418a6444-82fd-458e-8fcb-3bd20f70967a
issn:1214-9705

Subject:

Geologie. Meteorologie. Klimatologie, tektonika, geotectonics, Slovinsko, Slovenia, tectonic movements, active tectonics, monitoring, Dinaric fault system, Dinaric fault system, 7, and 551

Type:

article, články, model:article, and TEXT

Format:

print, bez média, and svazek

Description:

Monitoring of tectonic movements along three active faults of Dinaric (NW-SE trending) fault system in W Slovenia using TM 71 extensiometers was set up in 2004. After two and a half years of measurements clear trends of displacement were recorded. The average left-lateral displacement along a crack in the inner fault zone of the Idrija fault in Učja valley was reading 0.38 mm/year. Short term (10 months) rates were even greater and reached the value of 0.54 mm/year. Since the Idrija fault is considered generally to be dextral strike-slipping, the observed left-lateral displacement can be explained by variations in principle stress. Raša fault monitoring site at the foot of Vremščica Mt. established an average reverse uplift of hanging wall (SW) block of 0.24 mm/year and left-lateral displacement of 0.16 mm/year. Short term (9 months) vertical displacements reached the value of 0.53 mm/year. The inclined displacement is in agreement with geological and seismological observations. In the Postojna cave system two instruments were installed at the fault which extends parallely to Predjama fault zone. The average vertical displacement rate at Postojna 1 site was 0.01 mm/year. Both devices recorded similar reaction which can be attributed to 12 July, 2004 (Mw=5.2) earthquake with an epicentre 70 km away from the measuring site. Since there were no other stronger earthquakes in the vicinity and time span of monitoring, no other correlations were established with earthquake activity. The observed displacement rates along all three monitored faults of up to 0.5 mm/year are consistent with the regional deformation rate in W Slovenia established from GPS measurements which is of the order of 2 mm/year., Andrej Gosar, Stanka Šebela, Blahoslav Košťák and Josef Stemberk., and Obsahuje bibliografii

Language:

English

Rights:

http://creativecommons.org/licenses/by-nc-sa/4.0/
policy:public

Source:

Acta geodynamica et geomaterialia : | 2007 Volume:4 | Number:1 (145)

Harvested from:

CDK

Metadata only:

false