Podrobnosti záznamu

Název
    Stability of source mechanisms inverted from P-wave amplitude microseismic monitoring data acquired at the surface
Autor
    Eisner, Leo
    Moser, T.J.
    Staněk, František
Jazyk
    anglicky
Typ dokumentu
    článek v odborném periodiku
Zdrojový dokument - seriál
    Geophysical Prospecting
Svazek/č.
    Roč. 62, č. 3
Strany
    s. 475-490
Rok
    2014
Poznámky
    Projekt: GAP210/12/2451, GA ČR3cav_un_auth*0284895
    Rozsah: 16 s. : P
Předmětová kategorie
    inversion
    microseismic monitoring
    ray modelling
    source mechanism
Klíčové slovo
    Acquired
    Amplitude
    Data
    Inverted
    Mechanisms
    Microseismic
    Monitoring
    P-wave
    Source
    Stability
    Surface
Abstrakt (anglicky)
   We study the stability of source mechanisms inverted from data acquired at surface and near-surface monitoring arrays. The study is focused on P-wave data acquired on vertical components, as this is the most common type of acquisition. We apply ray modelling on three models: a fully homogeneous isotropic model, a laterally homogeneous isotropic model and a laterally homogeneous anisotropic model to simulate three commonly used models in inversion. We use geometries of real arrays, one consisting in surface receivers and one consisting in 'buried' geophones at the near-surface. Stability was tested for two of the frequently observed source mechanisms: strike-slip and dip-slip and was evaluated by comparing the parameters of correct and inverted mechanisms. We assume these double-couple source mechanisms and use quantitatively the inversion allowing non-double-couple components to measure stability of the inversion.
   To test the robustness we inverted synthetic amplitudes computed for a laterally homogeneous isotropic model and contaminated with noise using a fully homogeneous model in the inversion. Analogously amplitudes computed in a laterally homogeneous anisotropic model were inverted in all three models. We show that a star-like surface acquisition array provides very stable inversion up to a very high level of noise in data. Furthermore, we reveal that strike-slip inversion is more stable than dip-slip inversion for the receiver geometries considered here. We show that noise and an incorrect velocity model may result in narrow bands of source mechanisms in Hudson's plots.
Přispěvatel
    AV ČR Brno, Ústav struktury minerálů a hornin
Kód přispěvatele
    AV ČR, ÚSMH
Zdrojový formát
    U
Datum importu
    24. 10. 2014