Geophysical evidence of the Eastern Marginal Fault of the Cheb Basin (Czech Republic)

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F18%3A10389337" target="_blank" >RIV/00216208:11310/18:10389337 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/67985530:_____/18:00489016 RIV/67985891:_____/18:00489016

Výsledek na webu

<a href="https://doi.org/10.1007/s11200-017-0452-9" target="_blank" >https://doi.org/10.1007/s11200-017-0452-9</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s11200-017-0452-9" target="_blank" >10.1007/s11200-017-0452-9</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Geophysical evidence of the Eastern Marginal Fault of the Cheb Basin (Czech Republic)

Popis výsledku v původním jazyce

The western part of the Bohemian Massif hosts an intersection of two regional fault zones, the SW-NE trending Ohe/Eger Graben and the NNW-SSE trending Marianske Lazne Fault, which has been reactivated several times in the geological history and controlled the formation of the Tertiary Cheb Basin. The broader area of the Cheb Basin is also related to permanent seismic activity of M-L 3+ earthquake swarms. The Eastern Marginal Fault of the Cheb Basin (northern segment of the Marianske Lazne Fault) separates the basin sediments and underlying granites in the SW from the Krune Hory/Erzgebirge Mts. crystalline unit in the NE. We describe a detailed geophysical survey targeted to locating the Eastern Marginal Fault and determining its geometry in the depth. The survey was conducted at the Kopanina site near the Novy Kostel focal zone, which shows the strongest seismic activity of the whole Western Bohemia earthquake swarm region. Complex geophysical survey included gravimetry, electrical resistivity tomography, audiomagnetotellurics and seismic refraction. We found that the rocks within the Eastern Marginal Fault show low resistivity, low seismic velocity and density, which indicates their deep fracturing, weathering and higher water content. The dip of the fault in shallow depths is about 60 degrees towards SW. At greater depths, the slope turns to subvertical with dip angle of about 80 degrees. Results of geoelectrical methods show blocky fabric of the Cheb Basin and deep weathering of the granite bedrock, which is consistent with geologic models based on borehole surveys.

Název v anglickém jazyce

Geophysical evidence of the Eastern Marginal Fault of the Cheb Basin (Czech Republic)

Popis výsledku anglicky

The western part of the Bohemian Massif hosts an intersection of two regional fault zones, the SW-NE trending Ohe/Eger Graben and the NNW-SSE trending Marianske Lazne Fault, which has been reactivated several times in the geological history and controlled the formation of the Tertiary Cheb Basin. The broader area of the Cheb Basin is also related to permanent seismic activity of M-L 3+ earthquake swarms. The Eastern Marginal Fault of the Cheb Basin (northern segment of the Marianske Lazne Fault) separates the basin sediments and underlying granites in the SW from the Krune Hory/Erzgebirge Mts. crystalline unit in the NE. We describe a detailed geophysical survey targeted to locating the Eastern Marginal Fault and determining its geometry in the depth. The survey was conducted at the Kopanina site near the Novy Kostel focal zone, which shows the strongest seismic activity of the whole Western Bohemia earthquake swarm region. Complex geophysical survey included gravimetry, electrical resistivity tomography, audiomagnetotellurics and seismic refraction. We found that the rocks within the Eastern Marginal Fault show low resistivity, low seismic velocity and density, which indicates their deep fracturing, weathering and higher water content. The dip of the fault in shallow depths is about 60 degrees towards SW. At greater depths, the slope turns to subvertical with dip angle of about 80 degrees. Results of geoelectrical methods show blocky fabric of the Cheb Basin and deep weathering of the granite bedrock, which is consistent with geologic models based on borehole surveys.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10505 - Geology

Projekt

<a href="/cs/project/GC16-10116J" target="_blank" >GC16-10116J: Tektonická aktivita západní části oherského riftu od pozdního kenozoika do současnosti</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2018

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Studia Geophysica et Geodaetica

ISSN

0039-3169

e-ISSN

—

Svazek periodika

62

Číslo periodika v rámci svazku

4

Stát vydavatele periodika

CZ - Česká republika

Počet stran výsledku

21

Strana od-do

660-680

Kód UT WoS článku

000450595100007

EID výsledku v databázi Scopus

2-s2.0-85048258047