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- W2054732613 abstract "Fault processes in Arctic ice are characterized by particle motion, propagation, and radiation. Estimates of these can be achieved through analysis of individual acoustic events induced by the faults. Thus data from a central Arctic experiment were analyzed. Particle velocity, displacement, and rise time, which characterize particle motion, were estimated through integration of the acoustic signals in the time domain. Particle displacement was in the range O(10−4)–O(10−2) m, significantly lower than that of earthquake-induced faults; particle velocity was 1–67 cm/s, on average 50% lower than that of a displacement discontinuity in rock. Fracture speed, strike angle, and source dimensions, which characterize fault propagation, were estimated in the frequency domain. Fracture speed estimates were in the range 200–1100 m/s. This wide range suggests either multiple fault mechanisms or a single mechanism at different stages in its propagation. Source dimensions were determined from the displacement spectra of the second integral of the signals, with source length 0.7–100 m, and depth 0.4–4 m. Finally, the radiation characteristics were estimated and tensile and shear fracture were identified, both in the low (10–100 Hz) and mid (100–350 Hz) frequency ranges." @default.
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- W2054732613 date "1998-05-01" @default.
- W2054732613 modified "2023-09-27" @default.
- W2054732613 title "Characterization of fault processes in central Arctic ice" @default.
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- W2054732613 doi "https://doi.org/10.1121/1.421913" @default.
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