| 利用地震走时反演阿尼玛卿缝合带东段及两侧基底结构 |
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| 引用本文： | 潘纪顺,颜廷松,徐朝繁,张先康,刘志,潘素珍,王帅军. 利用地震走时反演阿尼玛卿缝合带东段及两侧基底结构[J]. 地震研究, 2009, 32(3) |
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| 作者姓名： | 潘纪顺 颜廷松 徐朝繁 张先康 刘志 潘素珍 王帅军 |
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| 作者单位： | 华北水利水电学院,郑州,450011;中国地震局地球物理勘探中心,郑州,450002;华北水利水电学院,郑州,450011;中国地震局地球物理勘探中心,郑州,450002 |
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| 基金项目： | 国家自然科学基金，华北水利水电学院高层次人才科研启动项目联合资助 |
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| 摘 要： | 对11炮宽角地震反射/折射的Pg波走时数据进行了反演,结果表明:阿尼玛卿缝合带东段基底速度结构整体呈低速带分布,两侧的速度分布相对均匀;缝合带内基底界面剧烈下凹,最深达5.5 km,不存在稳定的基底界面;松潘-甘孜微块体基底界面整体埋深达3.5 km,相对平坦,其中部略微下凹;从缝合带过渡到西秦岭褶皱带,基底界面急剧抬升至1.8 km,之后迅速下降至4.7 km,然后趋于平坦;缝合带的地壳变形存在挤压和走滑两种形式,在缝合带及邻近地区,上部地壳物质曾有过向北方向逃逸的迹象.
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| 关 键 词： | 基底 阿尼玛卿缝合带 结构 射线方法 低速带 |
Basement Structure of A'nyemaqen Suture Zone and Its Adjacent Areas Determined by Seismic Traveltime Inversion |
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| PAN Ji-shun,YAN Ting-song,XU Zhao-fan,ZHANG Xian-kang,LIU Zhi,PAN Su-zhen,WANG Shuai-jun. Basement Structure of A'nyemaqen Suture Zone and Its Adjacent Areas Determined by Seismic Traveltime Inversion[J]. Journal of Seismological Research, 2009, 32(3) |
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| Authors: | PAN Ji-shun YAN Ting-song XU Zhao-fan ZHANG Xian-kang LIU Zhi PAN Su-zhen WANG Shuai-jun |
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| Affiliation: | 1.North China University of Water Conservancy and Electric Power;Zhengzhou 450011;Henan;China;2.Geophysical Exploration Center;CEA;Zhengzhou 450002;China |
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| Abstract: | The inversion results of the Pg data acquired by wide-angle seismic reflection/refraction data of 11 shots reveal that the basement velocity structure of the eastern part of A'nyemaqen suture zone is characterized by a low velocity zone while the velocity is even in its adjacent areas.The basement in A'nyemaqen suture zone is concave dramatically.Its maximum depth is about 5.5 km in it.The depth of the basement interface in Songpan-Ganzi block is about 3.5 km,and it is flat.The concave feature of the baseme... |
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| Keywords: | basement A'nyemaqen suture zone structure ray method low velocity zone. |
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