Podrobnosti záznamu

    Principal earthquakes: Theory and observations from the 2008 West Bohemia swarm
    Vavryčuk, Václav
Typ dokumentu
    článek v odborném periodiku
Zdrojový dokument - seriál
    Earth and Planetary Science Letters
    Roč. 305, č. 3-4
    s. 290-296
    ověřit granty u autora
    Projekt: IAA300120801, GA AV ČR3cav_un_auth*0241180
    Rozsah: 7 s.
    Výzkumný záměr: CEZ:AV0Z30120515
Předmětová kategorie
    failure criterion
    fault friction
    focal mechanism
    tectonic stress
Klíčové slovo
Abstrakt (anglicky)
   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.
    AV ČR Brno, Geofyzikální ústav
Kód přispěvatele
    AV ČR, GFÚ
Zdrojový formát
Datum importu
    9. 12. 2013