Titlebook: Q of the Earth: Global, Regional, and Laboratory Studies; Brian J. Mitchell,Barbara Romanowicz Book 1999 Springer Basel AG 1999 Borehole.G

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2504-3625 ntent, and the movement of solid state defects in the earth. For that reason an understanding of Q and its variation with position in the earth and with time should provide information in earth‘s tectonic evolution, as well as on aspects of its internal structure. Progress in understanding Q has suf

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Introductionn. Similarly, body-wave seismologists have long been aware of the severe effect that velocity gradients and low-velocity zones can have on wave amplitudes. Awareness that such effects can completely swamp those of anelasticity has, undoubtedly, deterred many investigators from pursuing research on seismic-wave attenuation.

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Book 1999 the movement of solid state defects in the earth. For that reason an understanding of Q and its variation with position in the earth and with time should provide information in earth‘s tectonic evolution, as well as on aspects of its internal structure. Progress in understanding Q has suffered from

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2-D Image of Seismic Attenuation beneath the Deep Seismic Sounding Profile “Quartz,” Russia SE direction, away from the Baltic Shield. Our model exhibits strong 2-D, vertical and horizontal attenuation contrasts. A high-attenuation layer in the depth range of 120–150 to 160–180 km can apparently be associated with the presence of a partial melts within the base of the lithosphere.

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Frequency-dependent Attenuation of High-frequency , and , Waves in the Upper Crust in Western Nagano., respectively. The frequency dependence of the quality factor of . waves is very weak as compared with that of . waves. The ratio of ../.. is larger than unity in the entire analyzed frequency range.