Frequency-dependent attenuation of shear waves in the crust of the southern Kanto area, Japan
Frequency-dependent attenuation of shear waves in the crust of the southern Kanto area, Japan
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DOI：
10.1785/bssa0840051387
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发表时间：
1994-10
影响因子：
3
通讯作者：
S. Kinoshita
中科院分区：
文献类型：
--
作者：
S. Kinoshita
利用强震资料，包括井下观测的前第三纪基底岩石中记录的加速度资料，估算了日本中部关东南部地区地壳中剪切波的衰减特征。根据对菲律宾海板块和欧亚板块下部与菲律宾海板块上部交界地带13个震源深度小于50 km的地震资料的分析，确定了离散频率范围为0.5 ~ 16 Hz的品质因子Qs（f）。假设几何扩展指数为-1（体波），估计的1/Qs（f）在该频率范围内显示出峰值结构。估计的峰值1/Qs（f）在0.8Hz处为10-2的量级。
The attenuation characteristics of shear waves in the crust of the southern Kanto area, central Japan, were estimated using strong-motion data, including acceleration data recorded in the pre-Tertiary basement rocks by means of downhole observation. The quality factor Qs(f) was determined for a range of discrete frequencies from 0.5 to 16 Hz from the analysis of data from 13 local earthquakes with focal depths of less than about 50 km that occurred in the Philippine Sea plate and in the boundary zone between the lower part of the Eurasian plate and the upper part of the Philippine Sea plate. The estimated 1/Qs(f) shows a peaked structure in this frequency range on the assumption that the geometrical spreading exponent is -1 (body waves). The estimated peak 1/Qs(f) is of the order of 10-2 at 0.8 Hz.