| 基于背景噪声的宁夏及邻区瑞利波层析成像 |
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| 引用本文： | 谢辉,马禾青,马小军,李青梅,张楠,任家琪.基于背景噪声的宁夏及邻区瑞利波层析成像[J].中国地震研究,2016(4):542-555. |
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| 作者姓名： | 谢辉 马禾青 马小军 李青梅 张楠 任家琪 |
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| 作者单位： | 宁夏回族自治区地震局, 宁夏银川 750001,宁夏回族自治区地震局, 宁夏银川 750001,宁夏回族自治区地震局, 宁夏银川 750001,宁夏回族自治区地震局, 宁夏银川 750001,宁夏回族自治区地震局, 宁夏银川 750001,宁夏回族自治区地震局, 宁夏银川 750001 |
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| 摘 要： | In this article,the vertical components of the continuous waveform data of 90 seismic stations in Ningxia and its adjacent regions recorded from January 2012 to December 2013 are used to obtain the Rayleigh surface wave group velocity dispersion images in the study area( 101°- 112°E,31°-42°N) according to the method of noise imaging,with period between 6s - 50s and resolution of 0.5°. The Yinchuan basin in the 6s - 26 s period obviously shows a low velocity anomaly,which is not uniform and has a tendency to gradually weaken; the Guanzhong Basin in 6 s-22s shows a strip of low velocity anomaly and demonstrates a transverse inhomogeneity,where velocity in the southeast is slightly faster than that in the northwest. In the 30s - 50s period it shows that in the Yinchuan graben basin and its southern area,there is a large low velocity anomaly area,which moves from northeast to southwest. It shows that between the main active tectonic zones,like mountains and basins,there are obvious geomorphologic boundaries. For example,the deep fault near Liupan Mountain is the dividing line between two large tectonic units of eastern and western of China. The inversion results have good correlation with the geological structure and the stratigraphic landform. The results are consistent with the results of artificial seismic section tomography across the basin. It provides an important basis for the dynamics of active tectonic zones and the mechanism of earthquake occurrence in this area.
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| 关 键 词： | 背景噪声 面波层析成像 地壳上地幔 宁夏及邻区 |
| 收稿时间： | 2015/11/2 0:00:00 |
| 修稿时间： | 2016/1/21 0:00:00 |
Rayleigh Wave Tomography of Ningxia and Its Adjacent Areas Based on Ambient Noise |
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| Xie Hui,Ma Heqing,Ma Xiaojun,Li Qingmei,Zhang Nan and Ren Jiaqi.Rayleigh Wave Tomography of Ningxia and Its Adjacent Areas Based on Ambient Noise[J].Earthquake Research in China,2016(4):542-555. |
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| Authors: | Xie Hui Ma Heqing Ma Xiaojun Li Qingmei Zhang Nan and Ren Jiaqi |
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| Institution: | Earthquake Administration of Ningxia Hui Autonomous Region, Yinchuan 750001, China,Earthquake Administration of Ningxia Hui Autonomous Region, Yinchuan 750001, China,Earthquake Administration of Ningxia Hui Autonomous Region, Yinchuan 750001, China,Earthquake Administration of Ningxia Hui Autonomous Region, Yinchuan 750001, China,Earthquake Administration of Ningxia Hui Autonomous Region, Yinchuan 750001, China and Earthquake Administration of Ningxia Hui Autonomous Region, Yinchuan 750001, China |
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| Abstract: | In this article, the vertical components of the continuous waveform data of 90 seismic stations in Ningxia and its adjacent regions recorded from January 2012 to December 2013 are used to obtain the Rayleigh surface wave group velocity dispersion images in the study area (101°-112°E, 31°-42°N) according to the method of noise imaging, with period between 6s-50s and resolution of 0.5°. The Yinchuan basin in the 6s-26s period obviously shows a low velocity anomaly, which is not uniform and has a tendency to gradually weaken; the Guanzhong Basin in 6s-22s shows a strip of low velocity anomaly and demonstrates a transverse inhomogeneity, where velocity in the southeast is slightly faster than that in the northwest. In the 30s-50s period it shows that in the Yinchuan graben basin and its southern area, there is a large low velocity anomaly area, which moves from northeast to southwest. It shows that between the main active tectonic zones, like mountains and basins, there are obvious geomorphologic boundaries. For example, the deep fault near Liupan Mountain is the dividing line between two large tectonic units of eastern and western of China. The inversion results have good correlation with the geological structure and the stratigraphic landform. The results are consistent with the results of artificial seismic section tomography across the basin. It provides an important basis for the dynamics of active tectonic zones and the mechanism of earthquake occurrence in this area. |
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| Keywords: | Surface wave tomography Crust and upper mantle Background noise Ningxia and its adjacent areas |
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