2021-11-29T19:12:55Zhttps://repository.dl.itc.u-tokyo.ac.jp/oaioai:repository.dl.itc.u-tokyo.ac.jp:000330062021-10-01T06:34:02ZAttenuation Characteristics and Phase Velocity of Long-Period Rayleigh Waves長周期レイリー波の減衰特性と位相速度吉田, 満128691453application/pdfThe attenuation coefficients, Q values and phase velocities of Rayleigh waves excited by the Kurile Islands earthquake of 1963 have been obtained for the wave periods from 100 to 330 seconds by means of Fourier spectral analysis. Due to the path effect that the great circle paths of the long-period surface waves are predominantly located along the circum-Pacific seismic zone, the coefficients determined are somewhat larger and Q values lower than the standard ones. The Rayleigh wave attenuation is calculated on the basis of the amplitude spectral ratios of Rn+2IRn which are about 0.2, 0.35 and 0.5 for the periods 100, 200 and 300 seconds respectively. A relationship between the apparent characteristics of Q values versus the wave period and the errors made in the wave analysis is discussed.departmental bulletin paper東京大学地震研究所1982-03-31application/pdf東京大學地震研究所彙報 = Bulletin of the Earthquake Research Institute, University of Tokyo456641652AN0016225800408972https://repository.dl.itc.u-tokyo.ac.jp/record/33006/files/ji0564002.pdfjpn