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用深井观测的地震研究东川地区随深度变化的场地放大因子.
引用本文:罗娣华,蒋乐群,赤松纯平,陈敏恭,叶建庆,蔡绍平,刘学军.用深井观测的地震研究东川地区随深度变化的场地放大因子.[J].地震学报,2001,23(1):68-78.
作者姓名:罗娣华  蒋乐群  赤松纯平  陈敏恭  叶建庆  蔡绍平  刘学军
作者单位:1)中国昆明650041云南省地震局 2)日本京都611-0011京都大学防灾所
基金项目:日本京都大学和云南省科委国际合作处资助
摘    要:采用中日合作,分别布设于东川垂直竖井中地下200m、100m 和地面3个位置的高精度数字化地震仪记录的地方震资料(震中距8.5~95km,震级ML1.3~5.1),用频谱比的分析方法计算了东川地区不同深度(-100m 和地面)的场地放大因子.在8个频率(f =0.75,1.0,1.5,2,3,4,5和12Hz)上所对应的在-100m 处的3个分向(N-S,E-W,U-D)的场地放大因子(与-200m 处相比),当0.75Hz f 2Hz时,为1.0~1.49;当2Hz< f <12Hz时,为0.47~0.99;在地面,3个分向在8个频率上所对应的场地放大因子(与-200m 处相比)均大于1,其值为1.6~7.63.-100m 处的S波和尾波场地放大因子与地面的S波和尾波的场地放大因子的相关系数,当0.75Hz f 2Hz频段时,分别为0.82和0.81;当2Hz< f<12Hz频段时,分别为0.47和0.45. 

关 键 词:S波  尾波  噪音  场地放大因子
文章编号:0253-3782(2001)01-0068-11
修稿时间:2000年5月26日

STUDYING THE DEPTH-DEPENDENT VARIATION OF SITE MAGNIFICATION FACTOR IN DONGCHUAN BY EARTHQUAKES OBSERVED IN BOREHOLE
Luo Dihua,Jiang Lequn,Junpei Akamats,Chen Mingong,Ye Jianqing,Cai Shaoping,Liu Xuejun.STUDYING THE DEPTH-DEPENDENT VARIATION OF SITE MAGNIFICATION FACTOR IN DONGCHUAN BY EARTHQUAKES OBSERVED IN BOREHOLE[J].Acta Seismologica Sinica,2001,23(1):68-78.
Authors:Luo Dihua  Jiang Lequn  Junpei Akamats  Chen Mingong  Ye Jianqing  Cai Shaoping  Liu Xuejun
Abstract:WT5BZ]The digital seismometers with high accuracy are installed at depths of -200 m, -100 m in deep hole and on the surface in Dongchuan. By analysis of spectra ratio, the local events (with epicentral distances between 8.5 km and 95 km, magnitudes M L =1.3~ 5.1 ) recorded are used to calculate site magnification factor at different depths (-100 m and surface) in Dongchuan. Comparing results with that at the depth of -200 m, the site magnification factors at three components of N S, E W and U D corresponding to the depth of -100 m at 8 frequencies ( f = 0.75, 1.0, 1.5, 2, 3, 4, 6, and 12 Hz) are 1.0~1.49 when 0.75 < f <2 Hz and 0.47~0.99 when 2 < f < 12 Hz. On the surface, site magnification factors at three components are all greater than 1, i.e. between 1.6 and 7.63. The correlation coefficients of site magnification factors for S wave and coda at the depth of -100 m and on surface are 0.82 and 0.81 when 0.75 < f < 2 Hz, 0.47 and 0.45 when 2 < f <12 Hz, respectively.
Keywords:S wave  coda  noise  site magnification factor
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