What is it about?
Spatial aliasing is basically an ambiguity in the propagation direction for a plane-wave component of a wavefront. With three-component sensors you are measuring the direction of particle motion which is either along or perpendicular to the propagation direction, and essentially resolve the ambiguity without requiring a sensor every half wavelength.
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Why is it important?
With single-component sensors, you need a sensor every half wavelength, and with a linear array this will not resolve ambiguities at azimuths perpendicular to the array. With three-component sensors you can get very little ambiguities even with a very sparse array.
Perspectives
I believe that an optimal sensing array for measuring seismic waves would be composed of optical distributed acoustic sensing (DAS)!combined with a sparsely distributed array of optical or electrical three-component sensors. The densely distributed linear DAS array will resolve most properties of the seismic wavefield, and the sparsely distributed three-component array will resolve the propagation direction in 3D space.
Dr. Jakob Brandt Utne Haldorsen
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Read the Original
This page is a summary of: Spatial aliasing and 3C seismic sensors, Geophysics, June 2021, Society of Exploration Geophysicists,
DOI: 10.1190/geo2020-0172.1.
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