Record details

Title
    Moment tensor inversion of waveforms: a two-step time-frequency approach
Author
    Kühn, D.
    Vavryčuk, Václav
Language
    anglicky
Publication type
    článek v odborném periodiku
Source title - serial
    Geophysical Journal International
Vol./nr.
    Roč. 190, č. 3
Pages
    s. 1761-1776
Year
    2012
Notes
    Projekt: GAP210/12/1491, GA ČR, CZ3cav_un_auth*0285048
    Projekt: IAA300120801, GA AV ČR3cav_un_auth*0241180
    Rozsah: 16 s. : P
    Výzkumný záměr: CEZ:AV0Z30120515
Subject category
    computational seismology
    dynamics and mechanics of faulting
    earthquake source observations
    wave propagation
Keyword
    Approach
    Inversion
    Moment
    Tensor
    Time-frequency
    Two-step
    Waveforms
Abstract (in english)
   We present a moment tensor inversion of waveforms, which is more robust and yields more stable and more accurate results than standard approaches. The inversion is performed in two steps and combines inversions in time and frequency domains. First, the inversion for the source-time function is performed in the frequency domain using complex spectra. Second, the time-domain inversion for the moment tensor is performed using the source-time function calculated in the first step. In this way, we can consider a realistic, complex source-time function and still keep the final moment tensor inversion linear. Using numerical modelling, we compare the efficiency and accuracy of the proposed approach with standard waveform inversions. We study the sensitivity of the retrieved double-couple and non-double-couple components of the moment tensors to noise in the data, to inaccuracies of the location and of the velocity model, and to the type of the focal mechanism.
Contributor
    AV ČR Brno, Geofyzikální ústav
Contributor code
    AV ČR, GFÚ
Source format
    U
Import date
    9. 12. 2013