| 用地震走时反演长白山天池火山地区的二维地壳结构 |
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| 引用本文： | 王夫运 张先康 杨卓欣. 2002: 用地震走时反演长白山天池火山地区的二维地壳结构. 地震学报, 24(2): 144-152. |
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| 作者姓名： | 王夫运 张先康 杨卓欣 |
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| 作者单位： | （中国郑州450002中国地震局地球物理勘探中心） |
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| 基金项目： | 中国地震局“九五”重点项目 (95 11 0 2 0 1)资助 |
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| 摘 要： | 应用一种同时获得地壳上地幔二维速度结构和界面形态的地震走时反演算法，对在长白山天池火山区L1剖面获得的人工地震折射和宽角反射走时数据进行反演，得到了该剖面的地壳上地幔二维速度结构和构造．结果表明：长白山天池火山口下方中下地壳存在一倒三角状的低速体，壳内反射界面和莫霍面一致呈下凹形态，幅度2～6km不等，形成一个地壳根，推测是长白山天池火山系统．最后将所得结果与SEIS83正演试错模拟结果进行了比较．
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| 关 键 词： | 地震走时反演 二维速度结构 长白山天池火山 |
| 文章编号： | 0253-3782(2002)02-0144-09 |
| 修稿时间： | 2001-07-31 |
2-D CRUSTAL STRUCTURE OF CHANGBAISHAN-TIANCHI VOLCANIC REGION DETERMINED BY SEISMIC TRAVELTIME INVERSION |
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| Wang Fuyun Zhang Xiankang Yang Zhuoxin. 2-D CRUSTAL STRUCTURE OF CHANGBAISHAN-TIANCHI VOLCANIC REGION DETERMINED BY SEISMIC TRAVELTIME INVERSION[J]. Acta Seismologica Sinica, 2002, 24(2): 144-152 |
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| Authors: | Wang Fuyun Zhang Xiankang Yang Zhuoxin |
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| Abstract: | D velocity structure and tectonics of the crust and upper mantle is revealed by inversion of seismic refraction and wide-angle reflection traveltimes acquired along the profile L1 in the Changbaishan-Tianchi volcanic region. It is used in this study that seismic traveltime inversion for simultaneous determination of 2-D velocity and interface structure of the crust and upper mantle. The result shows that, under Changbaishan-Tianchi crater, there exists a low-velocity body in the shape of an inverted triangle, and the crustal reflecting boundaries and Moho all become lower by a varying margin of 2~6 km, forming a crustal root which is assumed to be the Changbaishan-Tianchi volcanic system. Finally, we make a comparison between our 2-D velocity model and the result from the studies by using trial-and-error forward modeling with SEIS83. |
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| Keywords: | seismic traveltime inversion 2-D velocity structure Changbaishan-Tianchi volcanic |
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