邯郸市周边断裂带的活动特征分析
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摘要
断裂活动和地震活动具有互为因果的关系,而不同于一般做法,文中用地震的活动性来分析断裂带的活动特征。为了解邯郸市周边存在的断裂带的活动特征,基于邯郸市附近地震台网监测的地震数据,利用地震纵波速度和震源位置联合反演方法,得到了邯郸市周边主要断裂带上地震波速度及震中在空间和时间上的分布特征,确定了地下壳质的纵波速度结构特征。综合分析表明:邯郸市周边小震的活动主要由磁县断裂和林州-武安断裂引起,太行山山前断裂带南端(邯郸—磁县段)几乎没有活动;地震活动集中在6～10km的范围内;活动时间特征是,从开始的2条断裂带同时活动逐渐演变为以磁县断裂活动为主。
Activity of fault zones can often lead to earthquake.On the contrary,earthquake can also help people to analyze and forecast the characteristics of faults.To know more about the characteristics of active faults around Handan,and serve better for the urban construction and planning,a joint inversion method,which is based on earthquake data from local seismic network in Handan,was employed in this paper to get the distribution characteristic of earthquake parameters in space and time on the main faults around Handan and determine the characteristics of P-wave velocity structure in the crustal medium.Integrated analysis shows:The small earthquake activities around Handan are caused mainly by Cixian Fault and the Linzhou-Wu'an Fault;There is almost no activity on the southern end of Taihang Mountains piedmont fault zone(Cixian-Wu'an section) ;Earthquake activities are concentrated in a range of 6 ～ 10km;Fault activity gradually evolved from the faulting of the two faults simultaneously at the beginning to that the Cixian Fault was dominant.
Activity of fault zones can often lead to earthquake.On the contrary,earthquake can also help people to analyze and forecast the characteristics of faults.To know more about the characteristics of active faults around Handan,and serve better for the urban construction and planning,a joint inversion method,which is based on earthquake data from local seismic network in Handan,was employed in this paper to get the distribution characteristic of earthquake parameters in space and time on the main faults around Handan and determine the characteristics of P-wave velocity structure in the crustal medium.Integrated analysis shows:The small earthquake activities around Handan are caused mainly by Cixian Fault and the Linzhou-Wu'an Fault;There is almost no activity on the southern end of Taihang Mountains piedmont fault zone(Cixian-Wu'an section) ;Earthquake activities are concentrated in a range of 6 ～ 10km;Fault activity gradually evolved from the faulting of the two faults simultaneously at the beginning to that the Cixian Fault was dominant.
引文
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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.
胡幸平,俞春泉,陶开,等.2008.利用P波初动资料求解汶川地震及其强余震震源机制解[J].地球物理学报,51(6):1711—1718.HU Xing-ping,YU Chun-quan,TAO Kai,et al.2008.Focal mechanism solutions of Wenchuan earthquake and its strongaftershocks obtained from initial P wave polarity analysis[J].Chinese J Geophys,51(6):1711—1718(in Chinese).
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 Naturalium 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 tomography inverse method used in velocity image reconstruction[J].Chinese Journal of Geophysics,32(1):46—61(in Chinese).
刘建华,刘福田,吴华,等.1989.中国南北带地壳和上地幔的三维速度结构[J].地球物理学报,32(2):143—151.LIU Jian-hua,LIU Fu-tian,WU Hua,et al.1989.The three-dimensional velocity structure of the crust and upper mantlebeneath the North-South Belt of China[J].Chinese Journal of Geophysics,32(1):46—61.
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].Inland 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 of relationship between fault activity and earthquakes in Jiangsu Province and its adjacent areas[J].Plateau Earthquake Research,20(1):38—43(in Chinese).
张学民,刁桂苓,赵英萍,等.2006.华北地区深部地幔剪切波速度结构研究[J].地球物理学报,49(6):1709—1719.ZHANG Xue-min,DIAO Gui-ling,ZHAO Ying-ping,et al.2006.Study on mantle shear wave velocity structures in NorthChina[J].Chinese J Geophys,49(6):1709—1719(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).
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 J Geophysics,49(4):1062—1067(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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