Podrobnosti záznamu

Název
    Is the seismic moment tensor ambiguous at a material interface?
Autor
    Vavryčuk, Václav
Jazyk
    anglicky
Typ dokumentu
    článek v odborném periodiku
Zdrojový dokument - seriál
    Geophysical Journal International
Svazek/č.
    Roč. 194, č. 1
Strany
    s. 395-400
Rok
    2013
Poznámky
    Projekt: FP7 Consortium Project AIM 230669, European Commission, XE3cav_un_auth*0301878
    Projekt: GAP210/12/1491, GA ČR, CZ3cav_un_auth*0285048
    Rozsah: 6 s. : P
Předmětová kategorie
    body waves
    dynamics and mechanics of faulting
    earthquake dynamics
    earthquake source observations
    seismic anisotropy
Klíčové slovo
    Ambiguous
    Interface
    Material
    Moment
    Seismic
    Tensor
Abstrakt (anglicky)
   The moment tensors are unique and describe the body force equivalents of rupture processes in any medium including faulting at a material interface, defined as the contact of two media with non-zero velocity or density contrasts. From a practical point of view, however, the moment tensor inversion of sources near or at a material interface is more involved than if the medium is smooth in the source area. First, the moment tensors of sources characterized by the same displacement discontinuity display jumps when the source crosses the interface. Consequently, the moment tensors become sensitive to the source location. If the source lies near the interface, the location into an incorrect half-space can introduce errors in the moment tensor. Second, if the source lies at the material interface, some of the spatial derivatives of the Green's function are, in general, discontinuous and the radiated wave field must be calculated using a generalized representation theorem.
   Third, the moment tensors are functions of averaged elastic parameters known from effective medium theory.
Přispěvatel
    AV ČR Brno, Geofyzikální ústav
Kód přispěvatele
    AV ČR, GFÚ
Zdrojový formát
    U
Datum importu
    23. 10. 2014