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- W2092194154 abstract "Abstract Extended earthquake source models, in which a rupture migrates in a fault plane, radiate signals whose duration show a directional variation. Analysis of spectral corner frequencies may be used to estimate the parameters of an extended source, but an alternative method is by the direct measurement of teleseismic body wave pulse durations on broad-band seismograms. This time-domain approach is shown to have certain advantages including easier estimation of confidence limits and treatment of interfering arrivals. A method is described for testing the compatibility of observed pulse durations with possible source geometries derived from a propagating rupture model. This establishes the identity of (or non-existence of) compatible source geometries; the results provide evidence to help discriminate between source directivity and anelastic attenuation, and between the fault and auxiliary planes. P, pP, PcP or other phases observed at only a small number of stations can provide sufficiently wide directional sampling of the focal sphere to place tight constraints on the parameters of commonly assumed rupture models. More constraint is imposed if the S-wave radiation is also sampled, for example with sP or direct S. Accurate measurement of durations is neither realistic nor essential: a confidence of ± 30% in pulse duration is typical, but better measurements are possible if the instrument phase response is removed from the observed seismogram. A synthetic example is used to demonstrate these points and real examples studied by previous authors are re-examined in more detail, to assess the value of this approach in the analysis of extended sources." @default.
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- W2092194154 date "1989-09-01" @default.
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- W2092194154 title "Interpretation of seismic pulse duration in terms of a propagating rupture: a method and case histories" @default.
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- W2092194154 doi "https://doi.org/10.1016/0040-1951(89)90208-4" @default.
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