The High-Frequency Decay Parameter (Kappa) in Taiwan

被引：13

作者：

Chang, Shun-Chiang ^{[1
]}

Wen, Kuo-Liang ^{[2
]}

Huang, Ming-Wey ^{[3
]}

Kuo, Chun-Hsiang ^{[4
]}

Lin, Che-Min ^{[4
]}

Chen, Chun-Te ^{[5
]}

Huang, Jyun-Yan ^{[4
]}

机构：

[1] Sinotech Engn Consultant LTD, Taipei, Taiwan

[2] Natl Cent Univ, Dept Earth Sci, Chungli, Taiwan

[3] Natl Sci & Technol Ctr Disaster Reduct, New Taipei, Taiwan

[4] Natl Ctr Res Earthquake Engn, Taipei, Taiwan

[5] Acad Sinica, Inst Earth Sci, Taipei, Taiwan

来源：

PURE AND APPLIED GEOPHYSICS | 2019年 / 176卷 / 11期

关键词：

Site effects; decay parameters; kappa; V-S30; Z1; 0; MOTION PREDICTION EQUATIONS; NEAR-SURFACE ATTENUATION; GROUND-MOTION; HARD-ROCK; SITE AMPLIFICATIONS; LOGGING DATA; SHEAR-WAVES; CHI-CHI; VELOCITY; MODEL;

D O I：

10.1007/s00024-019-02219-y

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

The high-frequency decay parameter kappa (kappa) was computed by fitting Fourier amplitude spectra from the seismic network of the Taiwan Strong Motion Instrumentation Program (TSMIP). The kappa of shear horizontal waves (SH waves) was calculated for individual recordings, and the relationship between kappa values and the epicentral distance (R-epi) of each station was derived for each station. The kappa value at R-epi = 0 (denoted as kappa(0)) can be used as a site parameter. There are totally 26,277 seismograms that have been recorded at 679 TSMIP stations over the period of 1993 through 2014 with local magnitudes of 4.0-7.1 and focal depths less than 30 km. The estimation of kappa(0) for Taiwan ranges from 0.0208 to 0.147 s, and the spatial distribution of kappa(0) was closely related to geology and velocity. The site-specific kappa(0) values from 425 stations were correlated with the averaged shear wave velocity of the top 30 m of strata (V-S30), and the relationship could be described as kappa(0) = (0.125 +/- 0.005) - (0.011 +/- 0.001) x ln(V-S30), and an acceptable linear correlation (R-2 = 0.57) was performed. The results may be used in the future application of ground motion prediction equations (GPMEs) and serve as simulation parameters. Also, the relationship between kappa(0) and the depth to engineering rock (Z(1.0)) is not well correlated, whereas an acceptable correlation exists between kappa(0) and other site proxies (i.e., elevation and resonant frequency).

引用

页码：4861 / 4879

页数：19

共 69 条

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