| 云南壳幔S波速度结构与强震的构造背景 |
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| 引用本文： | 张晓曼,胡家富,胡毅力,杨海燕,陈佳,彭恒初,文丽敏.云南壳幔S波速度结构与强震的构造背景[J].地球物理学报,2011,54(5):1222-1232. |
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| 作者姓名： | 张晓曼 胡家富 胡毅力 杨海燕 陈佳 彭恒初 文丽敏 |
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| 作者单位： | 云南大学地球物理系,昆明 650091 |
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| 基金项目： | 国家自然科学基金，云南省基金项目 |
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| 摘 要： | 本文选取云南及周边65个台站记录到的47个地震事件,利用相匹配滤波技术分离出了基阶Rayleigh面波信号.选取与震中处于同一大圆弧上的两个台站,利用双台格林函数法获取了台间相速度频散,频散的周期范围在10～80 s之间.从2000个波形记录中提取了152个台站对之间的相速度频散,最后,利用台间的相速度频散反演得到云南...
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| 关 键 词： | 基阶Rayleigh波 相速度频散 S波速度结构 强震 孕震背景 |
| 收稿时间： | 2010-08-05 |
The S-wave velocity structure in the crust and upper mantle as well as the tectonic setting of strong earthquake beneath Yunnan region |
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| ZHANG Xiao-Man,HU Jia-Fu,HU Yi-Li,YANG Hai-Yan,CHEN Jia,PENG Heng-Chu,WEN Li-Min.The S-wave velocity structure in the crust and upper mantle as well as the tectonic setting of strong earthquake beneath Yunnan region[J].Chinese Journal of Geophysics,2011,54(5):1222-1232. |
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| Authors: | ZHANG Xiao-Man HU Jia-Fu HU Yi-Li YANG Hai-Yan CHEN Jia PENG Heng-Chu WEN Li-Min |
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| Institution: | Department of Geophysics, Yunnan University, Kunming 650091,China |
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| Abstract: | The technique of phase-matched filter is applied to extract the fundamental Rayleigh surface waves from 47 seismic events recorded by 65 digital seismic stations, which are deployed in Yunnan and its adjacent region. The phase velocity dispersion between two stations that are located on the same great circle with the epicenter, in the period range of 10~80 s, is computed by the inter-station Green's function. We extract the phase velocity dispersion within 152 pairs of stations from 2000 waveforms, and then invert it for the S-wave velocity structure in a depth of 0~200 km. The result shows that the overall variation of the crust thickness beneath Yunnan has a south-north trend, increasing gradually from 30 km in the south to 60 km in the north. The Moho shows uplift and depression locally, and is basically featured with one uplift and two depressions. Additionally, the lithosphere structures are significantly different across the Red-river fault in western Yunnan. Beneath the Baoshan, Wanding, Cangyuan, and Simao areas that are geologically located in the Yunnan-Myanmar-Thailand block, there are low-velocity areas from depth 70 km to 120 km on the west side of Red-river fault. In contrast, in the Central-Yunnan block that is located on the east side of the fault, the low-velocity zone in upper mantle only exists beneath the Kangdian palaeo-uplift, and the S-wave velocity in upper mantle varies between 4.4 to 4.6 km/s beneath most areas. |
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| Keywords: | Fundamental Rayleigh surface wave Phase velocity dispersion S-wave velocity structure Strong earthquake Seismogenic background |
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