Geophysical field pattern in the West Bohemian geodynamic
active area

J 2000

Geophysical field pattern in the West Bohemian geodynamic active area

ŠVANCARA, Jan, Ivan GNOJEK, František HUBATKA a Karel DĚDÁČEK

Základní údaje

Originální název

Geophysical field pattern in the West Bohemian geodynamic active area

Autoři

ŠVANCARA, Jan, Ivan GNOJEK, František HUBATKA a Karel DĚDÁČEK

Vydání

STUDIA GEOPHYSICA ET GEODETICA, Praha, StudiaGeo Praha, 2000, 0039-3169

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10507 Volcanology

Stát vydavatele

Česká republika

Utajení

není předmětem státního či obchodního tajemství

Impakt faktor

Impact factor: 0.761

Kód RIV

RIV/00216224:14310/00:00003469

Organizační jednotka

Přírodovědecká fakulta

UT WoS

000088259400016

Klíčová slova anglicky

Earthquake swarm; Bohemian Massif; Saxothuringian Zone; Karlovy Vary Pluton; Cheb Basin; gravity; airborne magnetometry; airborne gamma-ray spectrometry; seismic profile 9HR; density model; stress field; geomorphology

Štítky

airborne gamma-ray spectrometry, airborne magnetometry, Bohemian massif, Cheb Basin, density model, Earthquake swarm, Geomorphology, gravity, Karlovy Vary Pluton, Saxothuringian Zone, seismic profile 9HR, stress field

Změněno: 5. 1. 2001 14:08, RNDr. Jan Švancara, CSc.

Anotace

V originále

Regional geophysical data from detailed gravity survey, airborne magnetometry and gamma-ray spectrometry were analysed in order to determine the subsurface extent of contrasting geological bodies and to highlight subtle anomalies which can be related to the occurrence of earthquake swarms. Potential field data were compiled into contour and colour-shaded relief maps suitable for detecting structural tectonic elements. A shaded relief map of the horizontal gradient of gravity was used to detect considerable structural and tectonic features. The results of airborne gamma-ray spectrometry, showing the regional total gamma-ray activity, abundance of uranium, thorium and potassium, were included in this study. Only the two most instructive maps - the total gamma-ray activity and the abundance of potassium are shown. The main line of epicentres Nový Kostel - Počátky coincides well with the N-S configuration of abundances of these natural radioactive elements. The epicentres of micro-earthquakes detected by the local seismological network KRASLICE for the 1991 to 1998 period were plotted in the geophysical maps. The hypocentres of earthquakes in the main epicentral zone at Nový Kostel were projected onto the crustal density model based on the interpretation of seismic reflection profile 9HR and gravity data. The average distance between the Nový Kostel epicentral zone and the seismic profile was 4-5 km. Based on the interpretation of gravity data the hypocentres of the main epicentral zone seem to be associated with the western margin of the Eibenstock - Nejdek (Karlovy Vary) Pluton and, beside that, they follow the depth level where the allochtonnous part of the Saxothuringian Zone is thrust over the European parautochton. A drawing of the geodynamic model of the area is also shown.

Návaznosti

GA205/99/0907, projekt VaV

Název: Recentní geodynamika západních Čech ve vztahu ke stavbě zemské kůry (unikátní přírodní laboratoř)

Investor: Grantová agentura ČR, Recentní geodynamika západních Čech ve vztahu ke stavbě zemské kůry (unikátní přírodní laboratoř)

Citovat

ŠVANCARA, Jan, Ivan GNOJEK, František HUBATKA a Karel DĚDÁČEK. Geophysical field pattern in the West Bohemian geodynamic active area. STUDIA GEOPHYSICA ET GEODETICA. Praha: StudiaGeo Praha, 2000, roč. 2000, č. 2, s. 307-326. ISSN 0039-3169.

@article{345496,
   author = {Švancara, Jan and Gnojek, Ivan and Hubatka, František and Dědáček, Karel},
   article_location = {Praha},
   article_number = {2},
   keywords = {Earthquake swarm; Bohemian Massif; Saxothuringian Zone; Karlovy Vary Pluton; Cheb Basin; gravity; airborne magnetometry; airborne gamma-ray spectrometry; seismic profile 9HR; density model; stress field; geomorphology},
   language = {eng},
   issn = {0039-3169},
   journal = {STUDIA GEOPHYSICA ET GEODETICA},
   title = {Geophysical field pattern in the West Bohemian geodynamic active area},
   volume = {2000},
   year = {2000}
}

TY  - JOUR
ID  - 345496
AU  - Švancara, Jan - Gnojek, Ivan - Hubatka, František - Dědáček, Karel
PY  - 2000
TI  - Geophysical field pattern in the West Bohemian geodynamic active area
JF  - STUDIA GEOPHYSICA ET GEODETICA
VL  - 2000
IS  - 2
SP  - 307
EP  - 307
PB  - StudiaGeo Praha
SN  - 00393169
KW  - Earthquake swarm
KW  - Bohemian Massif
KW  - Saxothuringian Zone
KW  - Karlovy Vary Pluton
KW  - Cheb Basin
KW  - gravity
KW  - airborne magnetometry
KW  - airborne gamma-ray spectrometry
KW  - seismic profile 9HR
KW  - density model
KW  - stress field
KW  - geomorphology
N2  - Regional geophysical data from detailed gravity survey, airborne magnetometry and gamma-ray spectrometry were analysed in order to determine the subsurface extent of contrasting geological bodies and to highlight subtle anomalies which can be related to the occurrence of earthquake swarms. Potential field data were compiled into contour and colour-shaded relief maps suitable for detecting structural tectonic elements. A shaded relief map of the horizontal gradient of gravity was used to detect considerable structural and tectonic features. The results of airborne gamma-ray spectrometry, showing the regional total gamma-ray activity, abundance of uranium, thorium and potassium, were included in this study. Only the two most instructive maps - the total gamma-ray activity and the abundance of potassium are shown. The main line of epicentres Nový Kostel - Počátky coincides well with the N-S configuration of abundances of these natural radioactive elements. The epicentres of micro-earthquakes detected by the local seismological network KRASLICE for the 1991 to 1998 period were plotted in the geophysical maps. The hypocentres of earthquakes in the main epicentral zone at Nový Kostel were projected onto the crustal density model based on the interpretation of seismic reflection profile 9HR and gravity data. The average distance between the Nový Kostel epicentral zone and the seismic profile was 4-5 km. Based on the interpretation of gravity data the hypocentres of the main epicentral zone seem to be associated with the western margin of the Eibenstock - Nejdek (Karlovy Vary) Pluton and, beside that, they follow the depth level where the allochtonnous part of the Saxothuringian Zone is thrust over the European parautochton. A drawing of the geodynamic model of the area is also shown.
ER  -

ŠVANCARA, Jan, Ivan GNOJEK, František HUBATKA a Karel DĚDÁČEK. Geophysical field pattern in the West Bohemian geodynamic active area. \textit{STUDIA GEOPHYSICA ET GEODETICA}. Praha: StudiaGeo Praha, 2000, roč.~2000, č.~2, s.~307-326. ISSN~0039-3169.

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