| 华北克拉通中部地区背景噪声成像 |
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| 引用本文： | 唐有彩,陈永顺,杨英杰,丁志峰,刘瑞丰,冯永革,李鹏,俞春泉,魏松峤,范文渊,王海洋,周仕勇,宁杰远.华北克拉通中部地区背景噪声成像[J].地球物理学报,2011,54(8):2011-2022. |
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| 作者姓名： | 唐有彩 陈永顺 杨英杰 丁志峰 刘瑞丰 冯永革 李鹏 俞春泉 魏松峤 范文渊 王海洋 周仕勇 宁杰远 |
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| 作者单位： | 1. 北京大学地球与空间科学学院地球物理研究所,北京 100871;
2. GEMOC ARC National Key Centre, DEPS, Macquarie University, North Ryde, NSW 2109, Australia;
3. 中国地震局地球物理研究所,北京 100081;
4. 中国地震台网中心,北京 100045 |
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| 基金项目： | 国家基金委重大国际合作交流项目(40520120222)、国家基金委创新集体(40521002)和国家基金委重大研究计划(90814002)联合资助. |
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| 摘 要： | 利用华北地区的流动与固定地震观测台阵在2007年1月～12月期间的垂直分量记录,采用背景噪声层析成像方法获得了华北克拉通中部地区6～40 s的相速度和群速度分布图像.成像结果显示研究区地壳以及上地幔的速度结构存在很大的横向不均匀性.8～16 s的相速度以及8～20 s的群速度分布图像清晰地勾绘出华北地区盆地和隆起之间的...
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| 关 键 词： | 背景噪声层析成像 华北盆地 鄂尔多斯 山西断陷带 群速度 相速度 |
| 收稿时间： | 2010-07-31 |
Ambient noise tomography in north China craton |
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| TANG You-Cai,CHEN Yong-Shun,YANG Ying-Jie,DING Zhi-Feng,LIU Rui-Feng,FENG Yong-Ge,LI Peng,YU Chun-Quan,WEI Song-Qiao,FAN Wen-Yuan,WANG Hai-Yang,ZHOU Shi-Yong,NING Jie-Yuan.Ambient noise tomography in north China craton[J].Chinese Journal of Geophysics,2011,54(8):2011-2022. |
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| Authors: | TANG You-Cai CHEN Yong-Shun YANG Ying-Jie DING Zhi-Feng LIU Rui-Feng FENG Yong-Ge LI Peng YU Chun-Quan WEI Song-Qiao FAN Wen-Yuan WANG Hai-Yang ZHOU Shi-Yong NING Jie-Yuan |
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| Institution: | 1. Institute of Theoretical and Applied Geophysics (ITAG), School of Earth and Space Sciences, Peking University, Beijing 100871, China;
2. GEMOC ARC National Key Centre, DEPS, Macquarie University, North Ryde, NSW 2109, Australia;
3. Institute of Geophysics, China Earthquake Administration, Beijing 100081, China;
4. China Earthquake Network Center, Beijing 100045, China |
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| Abstract: | Peking University deployed two linear arrays (140 km apart) of 45 portable broadband seismometers across the southern part of Shanxi Rift during August 2006 to March 2008. Using the ambient noise records at these two arrays and some stations from North China Seismic Array (NCSA) of the Institute of Geophysics, China Earthquake Administration (CEA), permanent stations from Hebei Seismological Bureau and Shanxi Seismological Bureau, CEA, China, we obtained empirical Green's function of Rayleigh wave employing the cross-correlation technique. Then we measured group velocity and phase velocity at periods from 6 s to 40 s for all possible station pairs. The results of tomography show that substantial lateral variations exist between Ordos and North China Basin (NCB). Sedimentary basins of NCB and Shanxi Rift are clearly imaged as low velocity anomalies at periods of 8 s. Low group velocities at 12~20 s and phase velocities at 12~16 s may indicate a low velocity layer in the upper and middle crust beneath NCB. However, Ordos and Taihang uplift are imaged as high velocities in the same period range. The rapid change from low velocity anomaly to high anomaly between 16 s and 25 s in phase velocity maps and between 20 s and 30 s in group velocity maps suggests that the Moho depth beneath NCB is much shallower than that beneath Ordos. At longer periods (30~40 s), phase velocity maps show that the velocity beneath NCB is lower than that of Ordos, which could be related to the thinning of lithosphere and the upwelling of asthenosphere beneath NCB. Datong volcanic region is revealed as low velocity anomaly in group and phase velocity maps from 8 to 35 s, which could be caused either by high temperature or partial melt in the crust resulting from active magmatism. |
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| Keywords: | Ambient noise Tomography North China Basin Ordos Shanxi rift Group velocity Phase velocity |
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