The Virtual Refraction for Noisy Data and Elastic Media

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Conference Proceeding

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In this work we explain the origin of spurious energy related to refracted waves, but more importantly, we use this spurious event - which we call the virtual refraction - to quantify subsurface parameters (i.e., wave speeds and depth to interface). Using numerical examples we show the cause of this spurious wave. We illustrate its use in a numerical two-layer refraction experiment, providing an alternative approach to conventional intercept-time seismic refraction analysis (Palmer, 1986). Finally, we discuss possible advantages of this technique to conventional refraction methods; particularly, the ease of picking the virtual refraction velocity (even in the presence of noise) and its self-contained nature to invert for the subsurface parameters.

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