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Detection of stress anomaly produced by interaction of compressive fault steps in the West Bohemia swarm region, Czech Republic

Identifikátory výsledku

  • Kód výsledku v IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985530%3A_____%2F18%3A00495199" target="_blank" >RIV/67985530:_____/18:00495199 - isvavai.cz</a>

  • Výsledek na webu

    <a href="http://dx.doi.org/10.1029/2018TC005163" target="_blank" >http://dx.doi.org/10.1029/2018TC005163</a>

  • DOI - Digital Object Identifier

    <a href="http://dx.doi.org/10.1029/2018TC005163" target="_blank" >10.1029/2018TC005163</a>

Alternativní jazyky

  • Jazyk výsledku

    angličtina

  • Název v původním jazyce

    Detection of stress anomaly produced by interaction of compressive fault steps in the West Bohemia swarm region, Czech Republic

  • Popis výsledku v původním jazyce

    Observations of the 2008-2014 seismic activity in West Bohemia, Czech Republic, provide evidence of interaction of compressive fault steps that created local stress anomaly and triggered a seismic sequence with exceptional properties. The West Bohemia is a geothermal area, characterized by persistent fluid-driven seismicity in the form of earthquake swarms. The focal zone is formed by two weak and fluid-eroded parallel strike-slip faults with a step of about 200m. The fault segments were activated successively by the 2008 and 2011 swarms with magnitudes of the strongest events of 3.8 and 3.7, respectively. In 2014, a fracture linking both segments was formed or activated by a mainshock-aftershock sequence. The aftershock decay was very fast, and the focal mechanism of the strongest event with magnitude of 4.2 was inconsistent with the regional background stress. The stress inversion of 957 focal mechanisms revealed a stress anomaly characterized by interchanging the sigma(2) and sigma(3) principal stress axes in the area of fault interaction. The modeling of the Coulomb stress change confirmed that the stress anomaly could completely disturb the regional background stress and produce the rotation of the principal stress axes retrieved from focal mechanisms. The faults activated or newly formed within the compressive stress anomaly were of high strength, which caused the anomalous mainshock-aftershock character of the 2014 activity and the rapid aftershock decay. Linking the two previously active isolated faults during the 2014 activity increased the expected moment magnitude M-w of a possible strongest earthquake from 5.0 to 5.4.

  • Název v anglickém jazyce

    Detection of stress anomaly produced by interaction of compressive fault steps in the West Bohemia swarm region, Czech Republic

  • Popis výsledku anglicky

    Observations of the 2008-2014 seismic activity in West Bohemia, Czech Republic, provide evidence of interaction of compressive fault steps that created local stress anomaly and triggered a seismic sequence with exceptional properties. The West Bohemia is a geothermal area, characterized by persistent fluid-driven seismicity in the form of earthquake swarms. The focal zone is formed by two weak and fluid-eroded parallel strike-slip faults with a step of about 200m. The fault segments were activated successively by the 2008 and 2011 swarms with magnitudes of the strongest events of 3.8 and 3.7, respectively. In 2014, a fracture linking both segments was formed or activated by a mainshock-aftershock sequence. The aftershock decay was very fast, and the focal mechanism of the strongest event with magnitude of 4.2 was inconsistent with the regional background stress. The stress inversion of 957 focal mechanisms revealed a stress anomaly characterized by interchanging the sigma(2) and sigma(3) principal stress axes in the area of fault interaction. The modeling of the Coulomb stress change confirmed that the stress anomaly could completely disturb the regional background stress and produce the rotation of the principal stress axes retrieved from focal mechanisms. The faults activated or newly formed within the compressive stress anomaly were of high strength, which caused the anomalous mainshock-aftershock character of the 2014 activity and the rapid aftershock decay. Linking the two previously active isolated faults during the 2014 activity increased the expected moment magnitude M-w of a possible strongest earthquake from 5.0 to 5.4.

Klasifikace

  • Druh

    J<sub>imp</sub> - Článek v periodiku v databázi Web of Science

  • CEP obor

  • OECD FORD obor

    10507 - Volcanology

Návaznosti výsledku

  • Projekt

    <a href="/cs/project/GC16-19751J" target="_blank" >GC16-19751J: Určení seismické anizotropie a útlumu z akustických emisí a pozorování přirozené a indukované seismicity</a><br>

  • Návaznosti

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

Ostatní

  • Rok uplatnění

    2018

  • Kód důvěrnosti údajů

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

Údaje specifické pro druh výsledku

  • Název periodika

    Tectonics

  • ISSN

    0278-7407

  • e-ISSN

  • Svazek periodika

    37

  • Číslo periodika v rámci svazku

    11

  • Stát vydavatele periodika

    US - Spojené státy americké

  • Počet stran výsledku

    14

  • Strana od-do

    4212-4225

  • Kód UT WoS článku

    000453542200007

  • EID výsledku v databázi Scopus

    2-s2.0-85056790781