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- W2890926652 abstract "Resonant seismic emission of subsurface objects Valeri Korneev, Lawrence Berkeley National Laboratory ABSTRACT The presented numerical modeling results and field data indicate that some contrast subsurface objects (such as tunnels, caves, pipes, filled pits, and fluid-filled fractures) are capable of generating durable resonant oscillations after trapping seismic energy. These oscillations are comprised of surface types of circumferential waves which repeatedly propagate around the object. The resonant emission of such trapped energy occurs primarily in the form of shear body waves that can be detected by remotely placed receivers. Resonant emission reveals itself in the form of sharp resonant peaks for the late parts of the records, when all the strong direct and primary reflected waves are gone. These peaks have been observed in the field data for a buried barrel filled with water, in 2D finite-difference modeling results and in the exact canonical solution for a fluid-filled sphere. A computed animation for the diffraction of a plane wave upon a low-velocity elastic sphere confirms the generation of resonances by durable surface waves. I show that resonant emission has characteristic quasi-hyperbolic travel-time patterns on shot-gathers. The inversion of these patterns can be performed in the frequency domain after muting the strong direct and primary scattered waves. Subsurface objects can be detected and imaged at a single resonance frequency without an accurate knowledge of source trigger time. The imaging of subsurface objects requires information about the shear velocity distribution in an embedding medium, which can be done interactively during inversion." @default.
- W2890926652 created "2018-09-27" @default.
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- W2890926652 date "2010-02-09" @default.
- W2890926652 modified "2023-09-26" @default.
- W2890926652 title "Resonant seismic emission of subsurface objects" @default.
- W2890926652 hasPublicationYear "2010" @default.
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