| 黑龙江地区背景噪声面波群速度层析成像 |
| |
| 引用本文： | 高东辉,陈永顺,孟宪,张永刚,唐有彩.黑龙江地区背景噪声面波群速度层析成像[J].地球物理学报,2011,54(4):1043-1051. |
| |
| 作者姓名： | 高东辉 陈永顺 孟宪 张永刚 唐有彩 |
| |
| 作者单位： | 1. 北京大学地球与空间科学学院 理论与应用地球物理研究所,北京 100871;
2. 黑龙江省地震局,哈尔滨 150090 |
| |
| 基金项目： | 黑龙江省科技攻关计划项目，黑龙江省地震局一般科研项目，国家自然科学基金委项目 |
| |
| 摘 要： | 本文选取黑龙江省台网及吉林、内蒙古部分台站共44个固定地震台站连续2年的地震数据,利用两个台站间互相关方法获得瑞利面波经验格林函数,再用自适应时频分析方法提取群速度频散曲线,最后利用传统面波层析成像方法反演获得黑龙江地区周期为8～40 s范围内群速度分布图像.反演结果揭示黑龙江地区地壳及上地幔群速度结构存在明显横向不均...
|
| 关 键 词： | 背景噪声 互相关 格林函数 群速度频散 面波层析成像 黑龙江地区 |
| 收稿时间： | 2010-09-27 |
Crustal and uppermost mantle structure of the Heilongjiang region from ambient noise tomography |
| |
| GAO Dong-Hui,CHEN Yongshun John,MENG Xian-Sen,ZHANG Yong-Gang,TANG You-Cai.Crustal and uppermost mantle structure of the Heilongjiang region from ambient noise tomography[J].Chinese Journal of Geophysics,2011,54(4):1043-1051. |
| |
| Authors: | GAO Dong-Hui CHEN Yongshun John MENG Xian-Sen ZHANG Yong-Gang TANG You-Cai |
| |
| Institution: | 1. Institute of Theoretical and Applied Geophysics, School of Earth and Space Sciences, Peking University, Beijing 100871, China;
2. Earthquake Administration of Heilongjiang Province, Harbin 150090, China |
| |
| Abstract: | We have inverted for the Rayleigh wave group velocity distribution of Heilongjiang province at periods of 8~40 s using ambient noise tomography. Two-years continuous data used in this study are from 44 permanent seismic stations of the Heilongjiang Regional Seismic Network and adjacent stations in Jilin and Inner Mongolia provinces. Green's functions were first extracted from cross-correlations of data at adjacent stations and group velocity dispersion measurements were then made using the frequency-time analysis method. Our results show significant lateral variations in crustal and uppermost mantle structures of the region. Group velocity anomalies at short periods correlate well with the surface geology of basins and mountains. The strong slow velocity anomaly at periods of 8~20 s beneath the Songliao basin suggests a rather thick sediment deposit. The reverse phenomenon of the fast and slow group velocity anomalies at periods of 16~25 s indicates that the Moho beneath the Greater Higgnan Mountains is at deeper depth than that in the Songliao basin. Slow velocity anomalies at long periods of 30~40 s were observed beneath the eastern area of the northern extension of the Tanlu fault zone, indicating upper mantle activities there such as localized asthenospheric upwelling. The work reported here has completed an important step towards incorporating teleseismic surface wave inversion of the crust and mantle structures of this northeast China region which could provide important observational constraints in understanding the tectonic process at the surface and distribution and origin of deep earthquakes beneath the region. |
| |
| Keywords: | Ambient noise Cross-correlations Green's function Group velocity dispersion Surface wave tomography Heilongjiang region |
| 本文献已被 万方数据 等数据库收录！ |
| 点击此处可从《地球物理学报》浏览原始摘要信息 |
| 点击此处可从《地球物理学报》下载免费的PDF全文 |
