On the importance of changes in the gravity field on seismic recording at ultralong periods
- 1 January 1981
- journal article
- Published by Proceedings of the National Academy of Sciences in Proceedings of the National Academy of Sciences
- Vol. 78 (1) , 20-21
- https://doi.org/10.1073/pnas.78.1.20
Abstract
The effect of changes in gravity induced by the Earth's deformation on seismic recording at ultralong periods is studied quantitatively for the low-order spheroidal modes of the Earth. Because this effect can either enhance or reduce the recorded amplitude of a mode, depending on its geometry, it may become nontrivial at the longest free-oscillation periods, and contribute to relative deviations of up to 17%.Keywords
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