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Effective Stress Drop of Earthquake Clusters

Identifikátory výsledku

  • Kód výsledku v IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F17%3A10363702" target="_blank" >RIV/00216208:11310/17:10363702 - isvavai.cz</a>

  • Výsledek na webu

    <a href="http://dx.doi.org/10.1785/0120170035" target="_blank" >http://dx.doi.org/10.1785/0120170035</a>

  • DOI - Digital Object Identifier

    <a href="http://dx.doi.org/10.1785/0120170035" target="_blank" >10.1785/0120170035</a>

Alternativní jazyky

  • Jazyk výsledku

    angličtina

  • Název v původním jazyce

    Effective Stress Drop of Earthquake Clusters

  • Popis výsledku v původním jazyce

    The static stress drop is a standard measure of the average decrease of shear stress on a fault during an earthquake. It has been observed that stress drop does not vary significantly with earthquake magnitude and may be regarded as an invariant parameter of the rupture process at different scales. Although typical stress drops of earthquakes range between 1 and 10 MPa, much smaller stress drops in fractions of MPa are reported for slow earthquakes and in some cases also for earthquake swarms. For the latter cases, the effective stress drop was introduced as an alternative parameter that makes use of the cumulative seismic moment and total activated area of the seis-mic cluster. In this article, we test how the effective stress drop is comparable to the static stress drop of a single earthquake rupturing the same fault portion. To this pur-pose, we compare the spatiotemporal evolution of the seismic moment release and analyze the uncertainties of the estimated stress drops. We show that the effective stress drop is only comparable to earthquake stress drops in specific cases. In particu-lar, the effective stress-drop values significantly underestimate the earthquake stress drops in the presence of aseismic deformation. The values are only scale independent if prestress and poststress conditions are uniform in space. Our analysis of data from injection-induced seismicity, natural earthquake swarms, and aftershock sequences shows that in most cases the effective stress-drop estimate is rather stable during the cluster evolution. However, slightly increasing estimates for injection-induced seismicity are indicative for the local forcing of the system. Although the effective stress drops of natural and induced seismicity in geothermal projects range from 0.1 to 3 MPa, those related to fracking in hydrocarbon formations are anomalous low, from 0.08 to 1.8 kPa, which hints to the important role of aseismic deformations.

  • Název v anglickém jazyce

    Effective Stress Drop of Earthquake Clusters

  • Popis výsledku anglicky

    The static stress drop is a standard measure of the average decrease of shear stress on a fault during an earthquake. It has been observed that stress drop does not vary significantly with earthquake magnitude and may be regarded as an invariant parameter of the rupture process at different scales. Although typical stress drops of earthquakes range between 1 and 10 MPa, much smaller stress drops in fractions of MPa are reported for slow earthquakes and in some cases also for earthquake swarms. For the latter cases, the effective stress drop was introduced as an alternative parameter that makes use of the cumulative seismic moment and total activated area of the seis-mic cluster. In this article, we test how the effective stress drop is comparable to the static stress drop of a single earthquake rupturing the same fault portion. To this pur-pose, we compare the spatiotemporal evolution of the seismic moment release and analyze the uncertainties of the estimated stress drops. We show that the effective stress drop is only comparable to earthquake stress drops in specific cases. In particu-lar, the effective stress-drop values significantly underestimate the earthquake stress drops in the presence of aseismic deformation. The values are only scale independent if prestress and poststress conditions are uniform in space. Our analysis of data from injection-induced seismicity, natural earthquake swarms, and aftershock sequences shows that in most cases the effective stress-drop estimate is rather stable during the cluster evolution. However, slightly increasing estimates for injection-induced seismicity are indicative for the local forcing of the system. Although the effective stress drops of natural and induced seismicity in geothermal projects range from 0.1 to 3 MPa, those related to fracking in hydrocarbon formations are anomalous low, from 0.08 to 1.8 kPa, which hints to the important role of aseismic deformations.

Klasifikace

  • Druh

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

  • CEP obor

  • OECD FORD obor

    10505 - Geology

Návaznosti výsledku

  • Projekt

    Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

  • Návaznosti

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

Ostatní

  • Rok uplatnění

    2017

  • Kód důvěrnosti údajů

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

Údaje specifické pro druh výsledku

  • Název periodika

    Bulletin of the Seismological Society of America

  • ISSN

    0037-1106

  • e-ISSN

  • Svazek periodika

    107

  • Číslo periodika v rámci svazku

    5

  • Stát vydavatele periodika

    US - Spojené státy americké

  • Počet stran výsledku

    11

  • Strana od-do

    2247-2257

  • Kód UT WoS článku

    000412920500020

  • EID výsledku v databázi Scopus