We studied the geophysical, physical, and geomechanical parameters of the Podlesi granites in the... more We studied the geophysical, physical, and geomechanical parameters of the Podlesi granites in the western part of the Krusne hory Mts., near the village of Potůcky. The granites represent a fractionated intrusion within the Nejdecký Massif. In total, the studied borehole is about 300 m deep. The samples were collected at depths of between 35 and 105 metres. Seismic P-wave and S-wave velocities were measured using ultrasonic scanning. The samples were water-saturated, unsaturated, and dried. The ultrasonic scanning system consisted of four piezoelectric sensors and a digital oscilloscope recorder. The wave frequency was 1 MHz. P-wave velocities range from 4400 m.s -1 to 6500 m.s -1 while S-wave velocities range from 2800 m.s -1 to 3800 m.s -1 . These data were used to calculate dynamic Young's modulus, dynamic shear modulus, and Poisson's ratio. The deformational characteristics of the rock were specified from experimental loading of the sample with uniaxial strain. The shear...
In 1901, M4.7 earthquake hit the area of NE Bohemia, Czech Republic. The Hronov-Poříčí
Fault (HPF... more In 1901, M4.7 earthquake hit the area of NE Bohemia, Czech Republic. The Hronov-Poříčí Fault (HPF) was found responsible for the event. Ongoing seismic monitoring proves the Hronov-Poříčí Fault Zone (HPFZ) is, in fact, the second most active area in the Bohemian Massif. Despite importance of the area, the HPFZ has not been described reasonably. Up to the moment, neither length of the HPFZ nor exact locations of its south branch are clear. Vagueness in length of the HPFZ causes large uncertainty in seismic risk assessment of the area. Integrated approach based on geographic information systems and remote sensing was employed to delineate lineaments in the wider HPFZ area. NASA provided Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) data was evaluated. ASTER digital elevation model provided basic topographic characteristics (surface curvature, slope and drainage systems). Edge detecting process was employed to define lineaments. Recent seismic activity and GPS monitored movements in the area were also assessed. The digital elevation model, extracted lineament, recent seismic activity, recent movements pointed out by GPS monitoring, were integrated and analysed in a geographic information system. Fault pattern suggested previously by various authors were compared with the GIS layers, and the extracted lineaments especially. Cross examination showed there are at least three possible variants of the south termination of the HPFZ. The spatial analysis also pointed out field tectonic mapping is necessary to describe the fault in detail and where to focus the survey.
This paper investigates the tectonic history and describes the paleostress evolution of the Hrono... more This paper investigates the tectonic history and describes the paleostress evolution of the Hronov-Poříčí Fault Zone in the northeastern part of the Bohemian Massif. A detailed structural research has been carried out in 50 localities. Faults and fractures have been investigated and measured. An analysis of the fault-slip data within the studied area resulted in the identification of four tectonic phases. The maximum principal stress was observed to be acting NE-SW during the first and youngest phase. The trend of the horizontal compression runs at 223° in the horizontal plane perpendicular to the reverse faults occurring in this phase, as well as to the studied fault zone. The minimum principal stress was found to be subvertical dipping at 87° and trending at 358°. Both the brittle tectonic investigations and paleostress analysis have documented that, at present, the Hronov-Poříčí Fault Zone is under compressive regime with dextral component.
We studied the geophysical, physical, and geomechanical parameters of the Podlesi granites in the... more We studied the geophysical, physical, and geomechanical parameters of the Podlesi granites in the western part of the Krusne hory Mts., near the village of Potůcky. The granites represent a fractionated intrusion within the Nejdecký Massif. In total, the studied borehole is about 300 m deep. The samples were collected at depths of between 35 and 105 metres. Seismic P-wave and S-wave velocities were measured using ultrasonic scanning. The samples were water-saturated, unsaturated, and dried. The ultrasonic scanning system consisted of four piezoelectric sensors and a digital oscilloscope recorder. The wave frequency was 1 MHz. P-wave velocities range from 4400 m.s -1 to 6500 m.s -1 while S-wave velocities range from 2800 m.s -1 to 3800 m.s -1 . These data were used to calculate dynamic Young's modulus, dynamic shear modulus, and Poisson's ratio. The deformational characteristics of the rock were specified from experimental loading of the sample with uniaxial strain. The shear...
In 1901, M4.7 earthquake hit the area of NE Bohemia, Czech Republic. The Hronov-Poříčí
Fault (HPF... more In 1901, M4.7 earthquake hit the area of NE Bohemia, Czech Republic. The Hronov-Poříčí Fault (HPF) was found responsible for the event. Ongoing seismic monitoring proves the Hronov-Poříčí Fault Zone (HPFZ) is, in fact, the second most active area in the Bohemian Massif. Despite importance of the area, the HPFZ has not been described reasonably. Up to the moment, neither length of the HPFZ nor exact locations of its south branch are clear. Vagueness in length of the HPFZ causes large uncertainty in seismic risk assessment of the area. Integrated approach based on geographic information systems and remote sensing was employed to delineate lineaments in the wider HPFZ area. NASA provided Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) data was evaluated. ASTER digital elevation model provided basic topographic characteristics (surface curvature, slope and drainage systems). Edge detecting process was employed to define lineaments. Recent seismic activity and GPS monitored movements in the area were also assessed. The digital elevation model, extracted lineament, recent seismic activity, recent movements pointed out by GPS monitoring, were integrated and analysed in a geographic information system. Fault pattern suggested previously by various authors were compared with the GIS layers, and the extracted lineaments especially. Cross examination showed there are at least three possible variants of the south termination of the HPFZ. The spatial analysis also pointed out field tectonic mapping is necessary to describe the fault in detail and where to focus the survey.
This paper investigates the tectonic history and describes the paleostress evolution of the Hrono... more This paper investigates the tectonic history and describes the paleostress evolution of the Hronov-Poříčí Fault Zone in the northeastern part of the Bohemian Massif. A detailed structural research has been carried out in 50 localities. Faults and fractures have been investigated and measured. An analysis of the fault-slip data within the studied area resulted in the identification of four tectonic phases. The maximum principal stress was observed to be acting NE-SW during the first and youngest phase. The trend of the horizontal compression runs at 223° in the horizontal plane perpendicular to the reverse faults occurring in this phase, as well as to the studied fault zone. The minimum principal stress was found to be subvertical dipping at 87° and trending at 358°. Both the brittle tectonic investigations and paleostress analysis have documented that, at present, the Hronov-Poříčí Fault Zone is under compressive regime with dextral component.
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Papers by Lucie Novakova
Fault (HPF) was found responsible for the event. Ongoing seismic monitoring proves the
Hronov-Poříčí Fault Zone (HPFZ) is, in fact, the second most active area in the Bohemian
Massif. Despite importance of the area, the HPFZ has not been described reasonably. Up to the
moment, neither length of the HPFZ nor exact locations of its south branch are clear.
Vagueness in length of the HPFZ causes large uncertainty in seismic risk assessment of the
area. Integrated approach based on geographic information systems and remote sensing was
employed to delineate lineaments in the wider HPFZ area. NASA provided Advanced
Spaceborne Thermal Emission and Reflection Radiometer (ASTER) data was evaluated.
ASTER digital elevation model provided basic topographic characteristics (surface curvature,
slope and drainage systems). Edge detecting process was employed to define lineaments.
Recent seismic activity and GPS monitored movements in the area were also assessed. The
digital elevation model, extracted lineament, recent seismic activity, recent movements
pointed out by GPS monitoring, were integrated and analysed in a geographic information
system. Fault pattern suggested previously by various authors were compared with the GIS
layers, and the extracted lineaments especially. Cross examination showed there are at least
three possible variants of the south termination of the HPFZ. The spatial analysis also pointed
out field tectonic mapping is necessary to describe the fault in detail and where to focus the
survey.
Fault (HPF) was found responsible for the event. Ongoing seismic monitoring proves the
Hronov-Poříčí Fault Zone (HPFZ) is, in fact, the second most active area in the Bohemian
Massif. Despite importance of the area, the HPFZ has not been described reasonably. Up to the
moment, neither length of the HPFZ nor exact locations of its south branch are clear.
Vagueness in length of the HPFZ causes large uncertainty in seismic risk assessment of the
area. Integrated approach based on geographic information systems and remote sensing was
employed to delineate lineaments in the wider HPFZ area. NASA provided Advanced
Spaceborne Thermal Emission and Reflection Radiometer (ASTER) data was evaluated.
ASTER digital elevation model provided basic topographic characteristics (surface curvature,
slope and drainage systems). Edge detecting process was employed to define lineaments.
Recent seismic activity and GPS monitored movements in the area were also assessed. The
digital elevation model, extracted lineament, recent seismic activity, recent movements
pointed out by GPS monitoring, were integrated and analysed in a geographic information
system. Fault pattern suggested previously by various authors were compared with the GIS
layers, and the extracted lineaments especially. Cross examination showed there are at least
three possible variants of the south termination of the HPFZ. The spatial analysis also pointed
out field tectonic mapping is necessary to describe the fault in detail and where to focus the
survey.