| 长白山天池火山区介质速度非均匀性谱结构 |
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| 引用本文： | 范小平,李清河,杨从杰,金淑梅.长白山天池火山区介质速度非均匀性谱结构[J].地球物理学报,2011,54(5):1215-1221. |
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| 作者姓名： | 范小平 李清河 杨从杰 金淑梅 |
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| 作者单位： | 江苏省地震局, 南京 210014 |
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| 基金项目： | 国家科技支撑计划项目，国家自然科学基金 |
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| 摘 要： | 观测和研究表明,非均匀介质RMS(Root Mean Square)速度微扰动ε,特征尺度相关距离a以及幂指数k的空间分布特征可描述介质非均匀性特征.本文选用长白山天池火山区的小震记录,运用S波包络展宽法对长白山天池火山区地壳浅部介质速度非均匀性谱结构进行了研究.结果发现长白山天池火山区地壳浅部介质呈现强烈的介质非均匀...
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| 关 键 词： | 介质非均匀性谱结构 S波包络展宽 长白山天池火山 |
| 收稿时间： | 2010-06-16 |
Spectral structure of velocity inhomogeneity of crust medium in Changbaishan Tianchi volcano |
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| FAN Xiao-Ping,LI Qing-He,YANG Cong-Jie,JIN Shu-Mei.Spectral structure of velocity inhomogeneity of crust medium in Changbaishan Tianchi volcano[J].Chinese Journal of Geophysics,2011,54(5):1215-1221. |
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| Authors: | FAN Xiao-Ping LI Qing-He YANG Cong-Jie JIN Shu-Mei |
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| Institution: | Earthquake Administration of Jiangsu Province, Nanjing 210014,China |
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| Abstract: | Observation and study show that the RMS (Root Mean Square) fractional velocity fluctuation ε, correlation distance a, and order κ can be used to evaluate the medium inhomogeneity of crust. Based on the analysis of small local earthquake waveforms, the spectral structure of velocity inhomogeneity in Changbaishan Tianchi volcano area was studied by the peak delay time of S-wave envelope broadening method. The results show that the shallow crust medium of Changbaishan Tianchi volcano area presents strong inhomogeneity and frequency dependence. In 2~4 Hz and 4~8 Hz bands, the small-scale and weak inhomogeneities lie in the southeast and northwest of Changbaishan Tianchi volcano and the large-scale and strong inhomogeneities lie in the northeast and southwest at the depth of 0~2 km and 2~5 km. In 8~16 Hz, the small-scale and weak inhomogeneities lie on the west of volcano at the depth of 0~2 km, but at the depth of 2~5 km, the weak inhomogeneities lie around the volcano. In 16~30 Hz, the small-scale and weak inhomogeneities lie in the southeast and northwest of Changbaishan Tianchi volcano at the depth of 0~2 km, and they lie on the southeast at the depth of 2~5 km, only a little lie on the northwest of Changbaishan Tianchi volcano. |
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| Keywords: | Spectral structure of velocity inhomogeneity S-wave envelope broadening Changbaishan Tianchi volcano |
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