| 应用层析成像技术研究华北地壳速度结构 |
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| 引用本文： | 李强,王椿镛,刘瑞丰,王溪莉,陈光英,陈光,李桂银.应用层析成像技术研究华北地壳速度结构[J].地震地磁观测与研究,1999,20(5):88-97. |
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| 作者姓名： | 李强 王椿镛 刘瑞丰 王溪莉 陈光英 陈光 李桂银 |
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| 作者单位： | 中国,北京,100081,中国地震局地球物理研究所 |
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| 基金项目： | 八五"国家科技攻关项目 |
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| 摘 要： | 利用华北地区１６９个地震台站记录的１９８４￣１９９５年的１６９６个地震的Ｐ波到时资料,重建了华北地区地壳三维速度图像,不同深度的速度图像表明：地壳中地震波速度的横向不均匀性显著,上地壳的速度分布与地有已知构造特征相联系;太行山山前断裂带是切割到地壳底部的深断裂带,２５ｋｍ深度普遍存在速度间断面;地壳底部起伏明显;强震孕育发生与其周围介质的不均匀性和土地幔的隆起或凹陷密切相关。
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| 关 键 词： | 华北地区 层析成像 速度图像 横向不均一性 间断面 强震 |
Application of tomography to the studies of crustal structure in North China |
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| Li Qiang,Wang Chunyong,Liu Ruifeng,Wang Xili,Chen Guangying,Chen Guang and Li Guiyin.Application of tomography to the studies of crustal structure in North China[J].Seismological and Geomagnetic Observation and Research,1999,20(5):88-97. |
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| Authors: | Li Qiang Wang Chunyong Liu Ruifeng Wang Xili Chen Guangying Chen Guang and Li Guiyin |
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| Abstract: | In this paper,the three dimensional velocity images beneath the North China are reconstructed by using P wave travel time data of regional earthquake recorded by the North China seismic network.The main results are as follows:(1)The velocity images display clearly the lateral heterogeneity in siesmic velocity in North China and The velocity distribution of upper crust are correlated to the surficial geological features.(2)The Taihang Mt.Piedmont fault zone can be traced down to the bottom of crust.(3)The velocity discontinuity surface generally exist at the depth of 25 km.(4)The crust mantle boundary is obviously undulated.(5)Development and occurrence of strong earthquakes have close relationship to the lateral heterogeneity in wave velocity and the upheaval or hollow of uppermost mantle. |
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| Keywords: | North China area tomography velocity image lateral heterogeneity discontinuity strong earthquake |
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