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| 利用背景噪声反演鄂尔多斯块体及其南缘地区地壳速度结构 | |
| 引用本文： | 陈强森,鲍学伟,徐树斌,王良书,徐鸣洁.利用背景噪声反演鄂尔多斯块体及其南缘地区地壳速度结构[J].高校地质学报,2013,19(3):504-512. |
| 作者姓名： | 陈强森 鲍学伟 徐树斌 王良书 徐鸣洁 |
| 作者单位： | 南京大学 地球科学与工程学院， 南京 210093 |
| 摘 要： | 文中利用分布在鄂尔多斯块体及其南部周缘地区的53 个宽频带地震固定台站的连续波形记录，采用双台互相关计算 方法由背景噪声提取瑞利波格林函数，经时频分析获得相速度和群速度频散曲线，并分别计算了汾渭地堑、秦岭北缘、鄂 尔多斯块体内部和六盘山地区4 个不同构造区的平均频散曲线，进而反演了各构造区的地壳上地幔一维横波速度结构。结 果显示：地壳厚度在汾渭地堑为34 km，在秦岭北缘地区和鄂尔多斯块体均为40 km，在六盘山地区最厚，达49~50 km；相 应的上地幔顶部横波速度分别为4.20，4.2，4.30 和4.15 km/s；地壳内结构浅部特征差异最大，在地壳中部六盘山地区的速 度较低，下部地壳不同地区的波速较一致。 |
| 关 键 词： | 背景噪声 格林函数 频散曲线 地壳上地幔速度结构 鄂尔多斯块体 |
The Crustal Velocity Structure of the Ordos Block and its Southern Edge Revealed from the Ambient Seismic Noise Extraction |
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| CHEN Qiangsen , BAO Xuewei , XU Shubin , WANG Liangshu , XU Mingjie.The Crustal Velocity Structure of the Ordos Block and its Southern Edge Revealed from the Ambient Seismic Noise Extraction[J].Geological Journal of China Universities,2013,19(3):504-512. | |
| Authors: | CHEN Qiangsen BAO Xuewei XU Shubin WANG Liangshu XU Mingjie |
| Institution: | CHEN Qiangsen;BAO Xuewei;XU Shubin;WANG Liangshu;XU Mingjie;School of Earth Sciences and Engineering, Nanjing University; |
| Abstract: | Using the dispersion curves of Rayleigh waves that were extracted from the seismic noise of 53 broad-band stations recorded in the Ordos Block and its southern Edge by two seismic stations cross correlation, we have obtained the average dispersion curve of the Fen-Wei graben system, the Northern edge of Qinling, the Ordos Block and the Liupan Mountains, and extracted the crustal and upper mantle structures of the four regions. The results show that the depth of the crust in the Fen-Wei graben system, the northern edge of Qinling and the Ordos Block, and the Liupan Mountains is 34 km, ~40 km, and 49~50 km, respectively. The velocity of S wave in the uppermost mantle of the corresponding region is 4.20 km/s, 4.25 km/s, 4.30 km/s, and 4.15 km/s. The most obvious difference of velocity structure appears in the upper crust. The Liupan Mountains has a low velocity in the middle crust. The characteristics of velocity are almost the same for the lower crust. |
| Keywords: | ambient seismic noise Green function dispersion curve crust and upper mantle velocity structure Ordos block |
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