The Earth as a Seismic Absorption Band

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Science  03 Jun 1977:
Vol. 196, Issue 4294, pp. 1104-1106
DOI: 10.1126/science.196.4294.1104


Attenuation of seismic waves indicates that the earth is not perfectly elastic. Dispersion accompanying absorption gives frequency-dependent "elastic" moduli, a fact that must be taken into account when inverting seismic data. Normal mode data are reinverted after correcting for absorption. The correction removes the discrepancy between body wave and free oscillation interpretations of earth structure.