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Volume 49 (1998)
- Issue 3+4 Pages 43-
- Issue 2 Pages 29-
- Issue 1 Pages 1-
Volume 49, Issue 2
Displaying 1-2 of 2 articles from this issue
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Hirotada Kanehisa1999 Volume 49 Issue 2 Pages 29-32
Published: 1999
Released on J-STAGE: October 20, 2006
JOURNAL FREE ACCESSAn unsteady extension of Bernoulli's theorem is presented. For steady flows, the derivative of the Bernoulli function in the normal direction perpendicular both to the streamline and the gradient of potential temperature becomes equal to the product of the flow speed and the binormal component of absolute vorticity. Even for unsteady flows, the same formula holds except that the absolute vorticity is replaced by the sum of the absolute vorticity and the local rotation rate of velocity.View full abstractDownload PDF (312K) -
Mitsuyuki Hoshiba, Yasuhiro Yoshida, Akio Katsumata, Kenji Maeda, Yuzo ...1999 Volume 49 Issue 2 Pages 33-42
Published: 1999
Released on J-STAGE: October 20, 2006
JOURNAL FREE ACCESSWe simultaneously separate source, propagation path, and site amplification effects from S waves spectra observed at four stations in southern Kanto, Japan. Assuming that observed S waves spectra are combination of source spectra, attenuation along ray path (Qs-1) and site amplification factor, linear inversion method is conducted after transfer of observed S waves spectra into a logarithmic scale. The station in the Kanto Basin but near the Kanto Mountains shows large site amplification factor for high frequency. Qs-1 is proportional to-0.5 power of frequency at 3-20 Hz. We define relatively low- and high-frequency-earthquakes based on the high frequency source spectrum. Depth distribution shows that deep earthquakes are high-frequency-earthquakes at 50-120km in focal depth. Epicenter distribution of low- and high-frequency-earthquakes does not show clear distinguishing characteristics.View full abstractDownload PDF (884K)
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