太行山断裂带南端的地震纵波速度结构分析
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摘要
断裂构造的活动是地震的成因之一。断裂构造上的小震速度结构分布为人们准确提供了地下壳质结构模型,为断裂的活动性分析提供了依据。文中结合太行山南端的地震台网监测资料,利用小震P波走时数据,通过震源和速度结构的联合反演,确定了太行山断裂构造南端的三维速度结构模型。结果表明:太行山山前断裂带的西侧存在NNE向断层,速度结构平面分布显示低速区沿断裂带呈条带状分布,太行山隆起区沉积层厚度由8km左右逐渐减薄为2km左右,同时受西侧作用力的影响地壳厚度逐渐增厚。
The activity of fault is one of the causes of earthquakes.The distribution of the velocity structure of small earthquakes on the fault structure can offer an accurate underground crust structure model for us to analyze the activity of fault.Using the seismic network monitoring data at the southern end of the Taihang Mountains and the small earthquake P wave travel time data,the paper reconstructs the three-dimensional velocity structure model for the southern end of the Taihang Mountains Fault zone by joint inversion of seismic source and velocity structure.The results show: on the west of Taihang Mountain piedmont fault zone,there exists a NNE-trending fault.Horizontal distribution shows a zonal distribution of low velocity zone along the fault zone.The thickness of the sedimentary layer in Taihangshan uplift has reduced gradually from approximately 8km to about 2km,while under the force from the western side,the crust thickens gradually.
The activity of fault is one of the causes of earthquakes.The distribution of the velocity structure of small earthquakes on the fault structure can offer an accurate underground crust structure model for us to analyze the activity of fault.Using the seismic network monitoring data at the southern end of the Taihang Mountains and the small earthquake P wave travel time data,the paper reconstructs the three-dimensional velocity structure model for the southern end of the Taihang Mountains Fault zone by joint inversion of seismic source and velocity structure.The results show: on the west of Taihang Mountain piedmont fault zone,there exists a NNE-trending fault.Horizontal distribution shows a zonal distribution of low velocity zone along the fault zone.The thickness of the sedimentary layer in Taihangshan uplift has reduced gradually from approximately 8km to about 2km,while under the force from the western side,the crust thickens gradually.
引文
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周龙泉,刘福田,刘劲松,等.2005.利用τ-P波场反演法确定东沙群岛的地壳速度模型[J].地球物理学进展,20(2):503—506.ZHOU Long-quan,LIU Fu-tian,LIU Jin-song,et al.2005.Determination of the crustal velocity model of Dongsha Islandsusing the inversion ofτ-P wave field[J].Progress in Geophysics,20(2):503—506(in Chinese).
Aki K,Lee W H K.1976.Determination of three-dimensional velocity anomalies under array using P arrival times fromlocal earthquakes(1):A homogeneous initial model[J].J Geophys Res,81:4381—4399.
Huang J,Zhao D,Zheng S.2002.Lithosperic structure and its relationship to seismic and volcanic activity in southwestChina[J].J Geophys Res,107(B10):10,1029/2000JB000137.
Zhao D,Mishra O,Sanda R.2002.Influence of fluids and magma on earthquakes:Seismological evidence[J].PhysEarth Planet Interi,102:249—267.
李树德.2001.试析地震与断裂的关系[J].北京大学学报(自然科学版),37(3):394—399.LI Shu-de.2001.A brief study on the relationships between earthquakes and active faults[J].Acta Scientiarum Natura-lium Universitatis Pekinensis,37(3):394—399(in Chinese).
刘福田,李强,吴华,等.1989.用于速度图像重建的层析成像法[J].地球物理学报,32(1):46—61.LIU Fu-tian,LI Qiang,WU Hua,et al.1989.On the tomographic inverse method used in velocity image reconstruction[J].Chinese Journal of Geophysics,32(1):46—61(in Chinese).
宋和平.2005.论新疆深大断裂特征与地震的关系[J].内陆地震,19(3):193—201.SONG He-ping.2005.The relation between characteristics of deep and big faults and earthquakes in Xinjiang[J].In-land Earthquake,19(3):193—201(in Chinese).
王斌,梁雪萍,周健.2008.江苏及其周边地区断裂活动性与地震关系的分析[J].高原地震,20(1):38—43.WANG Bin,LIANG Xue-ping,ZHOU Jian.2008.Analysis on relationship between fault activity and earthquakes inJiangsu Province and its adjacent areas[J].Plateau Earthquake Research,20(1):38—43(in Chinese).
周龙泉,刘福田,陈晓非.2006.三维介质中速度结构和界面的联合成像[J].地球物理学报,49(4):1062—1067.ZHOU Long-quan,LIU Fu-tian,CHEN Xiao-fei.2006.Simultaneous tomography of3-D velocity structure and interface[J].Chinese Journal of Geophysics,49(4):1062—1067(in Chinese).
周龙泉,刘福田,刘劲松,等.2005.利用τ-P波场反演法确定东沙群岛的地壳速度模型[J].地球物理学进展,20(2):503—506.ZHOU Long-quan,LIU Fu-tian,LIU Jin-song,et al.2005.Determination of the crustal velocity model of Dongsha Islandsusing the inversion ofτ-P wave field[J].Progress in Geophysics,20(2):503—506(in Chinese).
Aki K,Lee W H K.1976.Determination of three-dimensional velocity anomalies under array using P arrival times fromlocal earthquakes(1):A homogeneous initial model[J].J Geophys Res,81:4381—4399.
Huang J,Zhao D,Zheng S.2002.Lithosperic structure and its relationship to seismic and volcanic activity in southwestChina[J].J Geophys Res,107(B10):10,1029/2000JB000137.
Zhao D,Mishra O,Sanda R.2002.Influence of fluids and magma on earthquakes:Seismological evidence[J].PhysEarth Planet Interi,102:249—267.
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