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| 福建地区环境噪声瑞利波群速度层析成像 | |
| 引用本文： | 梁富华,金星,李军,王士成,陈超贤,王紫燕.福建地区环境噪声瑞利波群速度层析成像[J].中国地震,2012,28(1):22-32. |
| 作者姓名： | 梁富华 金星 李军 王士成 陈超贤 王紫燕 |
| 作者单位： | 1. 中国地震局工程力学研究所,哈尔滨市南岗区学府路29号,150080 2. 中国地震局工程力学研究所,哈尔滨市南岗区学府路29号 150080;福建省地震局,福州350003;福州大学,福州350003 3. 福建省地震局,福州,350003 |
| 摘 要： | 本文利用福建、广东、江西和浙江等4省数字地震监测台网中69个宽频带台站2010年4月13日～10月13日的速度型噪声记录和互相关技术,提取两两台站间的瑞利面波格林函数,并利用层析成像技术最终反演获得了福建地区(115.7～120.5°E、23.6～28.35°N)瑞利面波群速度的分布图像。结果表明,利用该方法得到的福建地区周期为3～5s的瑞利面波群速度在2.73～3.17km/s之间,平均速度为2.96km/s。瑞利波群速度横向变化与福建地区地表构造特征和地热异常区分布情况是基本吻合的;该群速度分布图在漳州盆地和福州盆地区域表现出非常明显的低速异常,这主要是因为受到盆地沉积层和高地热的影响;杉岭地块属于山地地形,但由于受到高地热的影响,因此表现为低速异常;永安-玳瑁山地块为山地区,而受到中地热的影响,速度异常表现较为复杂。 |
| 关 键 词： | 噪声 相干叠加 瑞利面波 层析成像 |
| 收稿时间： | 2011/1/13 0:00:00 |
Surface wave tomography of ambient seismic noise correlation in Fujian Province |
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| Liang Fuhu,Jin Xing,Li Jun,Wang Shicheng,Chen Chaoxian and Wang Ziyan.Surface wave tomography of ambient seismic noise correlation in Fujian Province[J].Earthquake Research in China,2012,28(1):22-32. | |
| Authors: | Liang Fuhu Jin Xing Li Jun Wang Shicheng Chen Chaoxian and Wang Ziyan |
| Institution: | 1) Institute of Engineering Mechanics,CEA,Harbin 150080,China2) Earthquake Administration of Fujian Province,Fuzhou 350003,China3) Fuzhou University,Fuzhou 350003,China |
| Abstract: | The vertical correlation coefficients between two stations at intervals of 1-day arecalculated with the 77 broad-band stations’microseisms records given by the Seismic MonitoringNetwork of Fujian,Guangdong,Jiangxi and Zhejiang Provinces from April 13,2010 to May 10,2010.The authors got the different coefficients and added the interferential coefficients.Based onthe chessboard test in seismology,the authors perform ambient noise tomography of FujianProvince(110° ～ 123° E,21° ～ 31° N) with the appropriate inversion matrix.The results implythat the signal-noise-ratio(SNR) increases proportional to the added times,and the groupvelocity of Rayleigh waves in Fujian Province is between 2.8km /s and 3.2km /s with averagevelocity 3.0km /s.The distribution of the group velocity is almost coincident with the topographyand the geothermy of Fujian Province.But because of the effects of both the topography and thegeothermy,the distribution of the group velocity in some areas is abnormal.From the groupvelocity distribution image,an obvious low velocity area can be found in the area of Zhangzhoubasin and Fuzhou basin.It must be affected by both the sedimentary and the geothermy deposit inthese two basins. |
| Keywords: | Ambient seismic noise Coherent stacking Chessboard test Rayleigh waveInversion |
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