Počet záznamů: 1

Principal earthquakes: Theory and observations from the 2008 West Bohemia swarm

  1. 1.
    0363814 - GFU-E 2012 RIV NL eng J - Článek v odborném periodiku
    Vavryčuk, Václav
    Principal earthquakes: Theory and observations from the 2008 West Bohemia swarm.
    Earth and Planetary Science Letters. Roč. 305, č. 3-4 (2011), s. 290-296 ISSN 0012-821X
    Grant CEP: GA AV ČR IAA300120801
    Výzkumný záměr: CEZ:AV0Z30120515
    Klíčová slova: earthquake * failure criterion * fault friction * focal mechanism * tectonic stress
    Kód oboru RIV: DC - Seismologie, vulkanologie a struktura Země
    Impakt faktor: 4.180, rok: 2011

    Earthquakes that occur on optimally oriented fault planes with respect to the tectonic stress regime display two distinct focal mechanisms and are fundamental characteristics of each seismically active region. These earthquakes, which we term 'principal', need not coincide with the strongest earthquakes or need not occur along the major active faults in the region. Stability analysis of diversely oriented fault planes under a given stress reveals that the focal mechanisms connected with unstable fault planes should not be very distinct from those of the principal earthquakes. The P/T axes form clusters with a typical two-wing or 'butterfly' pattern. This pattern is particularly visible when constructing the failure curves defined as a projection of the Mohr-Coulomb failure criterion in the Mohr's diagram onto the focal sphere. The position, shape and size of the failure curves depend on the stress orientation, shape ratio, friction and on the size of the instability area in the Mohr's diagram.
    Trvalý link: http://hdl.handle.net/11104/0199470