| 青藏高原地区瑞利波群速度和地壳构造 |
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| 引用本文： | 姚振兴,李白基,梁尚鸿,朱碚定,张立敏,卢善声.青藏高原地区瑞利波群速度和地壳构造[J].地球物理学报,1981,24(3):287-295. |
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| 作者姓名： | 姚振兴 李白基 梁尚鸿 朱碚定 张立敏 卢善声 |
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| 作者单位： | 1. 中国科学院地球物理研究所;
2. 云南省地震研究所;
3. 中国科学院计算技术研究所 |
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| 摘 要： | 本文用单台多重滤波方法测定了经过青藏高原地区瑞利波群速度频散曲线。所得基阶瑞利波的观测周期为5.0-56.0秒,速度标准偏差为0.08-0.15公里/秒,一阶瑞利波的观测周期范围为10-16秒,速度标准偏差为0.05-0.13公里/秒。利用广义线性反演方法对频散曲线进行反演,可得出一个由五层构成的地震横波速度地壳模型。在27-40公里之间存在低速层,其横波速度为3.29公里/秒,比上一层低0.21公里/秒。
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| 关 键 词： | 瑞利波群速度 青藏高原地区 地壳构造 面波 低速层 多重滤波 横波速度 广义线性反演 地壳厚度 初始模型 |
| 收稿时间： | 1980-02-12 |
ON THE GROUP VELOCITY OF RAYLEIGH WAVES AND THE CRUSTAL STRUCTURE OF QINGHAI-XIZANG PLATEAU |
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| YAO ZHEN-XING LI BAI-JI LIANG SHNAG-HONG ZUO PEI-DING ZHANG LI-MING LU SHAN-SHENG.ON THE GROUP VELOCITY OF RAYLEIGH WAVES AND THE CRUSTAL STRUCTURE OF QINGHAI-XIZANG PLATEAU[J].Chinese Journal of Geophysics,1981,24(3):287-295. |
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| Authors: | YAO ZHEN-XING LI BAI-JI LIANG SHNAG-HONG ZUO PEI-DING ZHANG LI-MING LU SHAN-SHENG |
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| Affiliation: | 1. Institute of Geophysics, Academia Sinica;
2. The Seiemological Institute,Yunnan Province;
3. Institute of Computing Technology, Academia Sinica |
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| Abstract: | The group velocity dispersion curves of Bayleigh waves through most of the Qing-hai-Xizang Plateau are obtained, using the single-station and multiple-filtering process. The observed period for the fundamental mode of Eayleigh waves ranging from 0.5 to 56.0 seconds. The standard deviations of the observed velocities are 0.08-0.15 km/sec. For the first mode, the periods are from 10 to 16 seconds, with the standard deviation of velocity determinations 0.05-0.13 km/sec. By means of generalized linear inversion of the dispersion curves, we obtained a five-layer crust model with a low-velocity layer at a depth between 27 to 40 km. The transverse wave velocity for the low velocity zone is 3.29 km/sec, and lower by 0.21 km/sec than that in the zone above. |
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