Abstract
Borehole seismograms from local earthquakes in the aftershock region of the 1984 western Nagano Prefecture, Japan earthquake were analyzed to measure the frequency-dependent characteristics of P- and S-wave attenuation in the upper crust. The records from a three-component velocity seismometer at the depth of 145 m exhibit high S/N-ratio in a wide frequency range up to 100 Hz. Extended coda normalization methods were applied to bandpass-filtered seismograms of frequencies from 25 to 102 Hz. For the attenuation of high-frequency P and S waves, our measurements show Q −1 P ≃ 0.052f −0.66 and Q −1 S ≃ 0.0034f −0.12, respectively. The frequency dependence of the quality factor of S waves is very weak as compared with that of P waves. The ratio of Q −1 P /Q −1 S is larger than unity in the entire analyzed frequency range.
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Yoshimoto, K., Sato, H., Iio, Y., Ito, H., Ohminato, T., Ohtake, M. (1998). Frequency-dependent Attenuation of High-frequency P and S Waves in the Upper Crust in Western Nagano, Japan. In: Mitchell, B.J., Romanowicz, B. (eds) Q of the Earth: Global, Regional, and Laboratory Studies. Pageoph Topical Volumes. Birkhäuser, Basel. https://doi.org/10.1007/978-3-0348-8711-3_12
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DOI: https://doi.org/10.1007/978-3-0348-8711-3_12
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