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- W152201912 abstract "A non-linear method is developed for the simultaneous inversion of Lg source spectra and path Q. The method is applicable to both earthquakes and explosions. The unknowns are the source corner frequency and seismic moment, as well as Lg Q sub O and Ti values (Lg Q at 1 Hz and its power-law frequency dependence) along the paths to the recording stations. The inverse algorithm determines different Q sub O and n values for each of the several paths, it is event-based, and it is suitable for real-time processing. The algorithm is further characterized by an exhaustive, non-linear search for source parameters and linear searches for Q sub O and n values. The search process is implemented in successive, increasingly refined steps, designed to accelerate the computation. With these characteristics, the inverse algorithm requires neither a starting model, nor a priori information on the source and Q; it thus avoids convergence to local minima, and is fast enough to be mini-computer based. The method is applied to three underground nuclear explosions in eastern Kazakhstan. The resulting seismic moment (M sub O) and corner frequency (F sub c) for the largest (JVE) event are 1.3 (+ or - O.l) x 10(exp more » 23) dyne-cm and 0.56 (+ or - O.02) Hz, respectively. These values are consistent with previous estimates using other methods and phases, as well as the source scaling relationships developed for NTS explosions. « less" @default.
- W152201912 created "2016-06-24" @default.
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- W152201912 date "1993-04-28" @default.
- W152201912 modified "2023-09-23" @default.
- W152201912 title "Attenuation and source studies in northern Eurasia. Semi-annual report, 9 July 1992-8 January 1993" @default.
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