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广东省东部地区背景噪声面波群速度层析成像
引用本文:黄元敏,沈玉松,杨马陵.广东省东部地区背景噪声面波群速度层析成像[J].中国地震研究,2013,27(4):490-500.
作者姓名:黄元敏  沈玉松  杨马陵
作者单位:广东省地震局,广州市先烈中路81号,510070;广东省地震局,广州市先烈中路81号,510070;广东省地震局,广州市先烈中路81号,510070
基金项目:This research was funded by the 2011 Earthquake Tracking Project of CEA (Grant No. 2011020105 ) and the open fund project of State Key Laboratory of Earthquake Dynamics ( Grant No. LED2011B04) .
摘    要:We perform Rayleigh wave tomography in east Guangdong and its surrounding regions by applying the ambient noise method to broadband data recorded at 26 stations from Guangdong, Fujian and Jiangxi Digital Seismic Networks. Cross-correlations of vertical- component ambient noise data are computed in one-day segments and stacked over seven months from March to September, 2011. Then Rayleigh wave group dispersion curves are measured using the frequency-time analysis method. Group velocity maps at periods from 5s to 15s are inverted. The resulting group velocity maps generally show good correlation with tectonic features, reflecting the velocity variations in the shallow crust. The basin areas are clearly resolved with lower group velocities at the short periods due to thick sedimentary layers, and the mountain areas with higher group velocities due to thin sedimentary layers. The variations of group velocity on the map can draw out the distribution of basins and mountains in study areas. The geothermal field can change the group velocity obviously, and lower group velocities are always found in high geothermal areas. The velocity maps indicate that a low-velocity layer may be found in the study areas.

关 键 词:数字地震台网  波群速度  环境噪声  地图显示  周边地区  层析成像  粤东  瑞利面波
收稿时间:2012/6/20 0:00:00

Rayleigh Wave Group Velocity Maps of East Guangdong and Its Surrounding Regions from Ambient Seismic Noise Tomography1
Huang Yuanmin,Shen Yusong and Yang Maling.Rayleigh Wave Group Velocity Maps of East Guangdong and Its Surrounding Regions from Ambient Seismic Noise Tomography1[J].Earthquake Research in China,2013,27(4):490-500.
Authors:Huang Yuanmin  Shen Yusong and Yang Maling
Institution:Earthquake Administration of Guangdong Province, Guangzhou 510070, China
Abstract:Ambient seismic noise Cross-correlation Green's function Dispersion curves
Keywords:Ambient seismic noise  Cross-correlation  Green's function  Dispersion curves
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