Detailed Information on Publication Record
2006
Present-day Seismicity of the Southeastern Elbe Fault System (NE Bohemian Massif)
ŠPAČEK, Petr, Zdeňka SÝKOROVÁ, Jana PAZDÍRKOVÁ, Jan ŠVANCARA, Josef HAVÍŘ et. al.Basic information
Original name
Present-day Seismicity of the Southeastern Elbe Fault System (NE Bohemian Massif)
Name in Czech
Recentní seismicita jihovýchodní části labského zlomového systému (sv. část Českého masivu)
Authors
ŠPAČEK, Petr (203 Czech Republic, guarantor), Zdeňka SÝKOROVÁ (203 Czech Republic), Jana PAZDÍRKOVÁ (203 Czech Republic), Jan ŠVANCARA (203 Czech Republic) and Josef HAVÍŘ (203 Czech Republic)
Edition
Studia geophysica et geodaetica, Praha, Geofyzikální ústav AV ČR, 2006, 0039-3169
Other information
Language
English
Type of outcome
Článek v odborném periodiku
Field of Study
10507 Volcanology
Country of publisher
Czech Republic
Confidentiality degree
není předmětem státního či obchodního tajemství
Impact factor
Impact factor: 0.603
RIV identification code
RIV/00216224:14310/06:00015851
Organization unit
Faculty of Science
UT WoS
000237665100005
Keywords in English
Sudetes; Bohemian Massif; Elbe Fault System; seismicity; fault activity; focal mechanisms; fluids
Tags
Změněno: 19/9/2006 15:25, Mgr. Petr Špaček, Ph.D.
V originále
The Variscan Bohemian Massif is disrupted by the NW-SE striking Elbe Fault System in its northern part. The increased tectonic activity associated with this structure is manifested by increased seismicity in the eastern part of the Sudetes. With the use of a temporary local seismic network, the total number of micro-earthquakes located in this region increased to 153 for the period 1996-2003. The local magnitudes vary between -0.6 and 1.8 and the seismic energy was often released in swarm-like sequences. Five seismic events with well-defined P-onset polarities at five or six stations enabled the estimation of focal mechanisms. The present-day activity of the WNW-ESE to NNW-SSE fault systems is discussed on the basis of source mechanisms, the alignment of the epicentres, as well as morphological and geological evidence. The majority of the recent seismic activity is concentrated in a 40-60 km wide zone of a generally NW-SE trend. This structure represents a regional zone of weakness within the SE termination of the Elbe Fault System, defined by a mesh of interconnected faults, of which many are deep-seated and highly permeable and some are associated with light to moderate historical earthquakes. Both in the areas due south and due north of this zone the present-day seismic activity is very low. The increased tectonic activity can be interpreted as a result of the abundance of suitably oriented faults and their interconnection into major fault systems, the proximity of the Outer Carpathian indentor and the Cainozoic volcanic and associated recent post-volcanic activity. The similar character of swarms and their coincidence with the post-volcanic activity in the southeastern part of the Elbe Fault System and in some focal zones of the western Bohemian seismically active area suggests that overpressurized fluids may represent a potential swarm-triggering mechanism.
In Czech
The Variscan Bohemian Massif is disrupted by the NW-SE striking Elbe Fault System in its northern part. The increased tectonic activity associated with this structure is manifested by increased seismicity in the eastern part of the Sudetes. With the use of a temporary local seismic network, the total number of micro-earthquakes located in this region increased to 153 for the period 1996-2003. The local magnitudes vary between -0.6 and 1.8 and the seismic energy was often released in swarm-like sequences. Five seismic events with well-defined P-onset polarities at five or six stations enabled the estimation of focal mechanisms. The present-day activity of the WNW-ESE to NNW-SSE fault systems is discussed on the basis of source mechanisms, the alignment of the epicentres, as well as morphological and geological evidence. The majority of the recent seismic activity is concentrated in a 40-60 km wide zone of a generally NW-SE trend. This structure represents a regional zone of weakness within the SE termination of the Elbe Fault System, defined by a mesh of interconnected faults, of which many are deep-seated and highly permeable and some are associated with light to moderate historical earthquakes. Both in the areas due south and due north of this zone the present-day seismic activity is very low. The increased tectonic activity can be interpreted as a result of the abundance of suitably oriented faults and their interconnection into major fault systems, the proximity of the Outer Carpathian indentor and the Cainozoic volcanic and associated recent post-volcanic activity. The similar character of swarms and their coincidence with the post-volcanic activity in the southeastern part of the Elbe Fault System and in some focal zones of the western Bohemian seismically active area suggests that overpressurized fluids may represent a potential swarm-triggering mechanism.
Links
| GP205/02/D139, research and development project |
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| MSM0021622412, plan (intention) |
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