| 波形反演方法及其在新疆地区转换波测深中的应用 |
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| 引用本文： | 范会吉,邵学钟.波形反演方法及其在新疆地区转换波测深中的应用[J].地球物理学报,1997,40(3):369-379. |
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| 作者姓名： | 范会吉 邵学钟 |
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| 作者单位： | 国家地震局地质研究所, 北京 100029 |
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| 摘 要： | 利用天然地震记录直达P波后续20s内的波形信息,研究了地壳、土地慢速度结构反演的方法、唯一性、精度及应注意的问题,并将求解有条件极值的惩罚数法和求解无条件极值的单纯形法引入到波形反演.数值计算证明,波形反演方法对记录的误差有压制作用,在深源、远震、各向同性水平层状近似合理的前提下,可用一个地震事件在射线平面内的二分量记录反演台站区地壳、上地幔P、S波速度结构.在新疆天山地区转换波流动台站观测中,选择出较好的记录进行波形反演,给出了该转换被测深剖面上6个台站下方的地壳、上地慢P、S波速度结构.通过塔里木盆地内一测点上波形反演和地震勘探结果的对比证明,波形反演方法具有满意的精度.
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| 关 键 词： | 波形反演 惩罚数法 速度结构 转换波测深 新疆地区 |
| 收稿时间： | 1995-02-24 |
WAVEFORM INVERSION METH0D AND ITS APPLICATION TO DATA RECORDED AT TIAN -SHAN MOUNTAIN AREA |
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| FAN HUI-JI,SHAO XUE-ZHONG,ZHANG JIA-RU.WAVEFORM INVERSION METH0D AND ITS APPLICATION TO DATA RECORDED AT TIAN -SHAN MOUNTAIN AREA[J].Chinese Journal of Geophysics,1997,40(3):369-379. |
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| Authors: | FAN HUI-JI SHAO XUE-ZHONG ZHANG JIA-RU |
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| Institution: | the Institute of Geology, SSB, Beijing 100029, China |
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| Abstract: | The Uniqueness and reliability of waveform inversion for determining the crustaland up -mantle structure under a receiver point are studied when it is aPplied to mo-bi1e station data' The conditions that the data should meet are listed in more detail.The sequential unconstrained minimization techulque (SUMT) is introduced for solvingthe nonlinear target function of the waveform inversion and it is compared withlinearized-iteration algorithm. It is proved that only a part of datum error istranstered to the resulted model by the waveform inversion and that the two compo-nents of the record of a teleseismic in a ray plane and deep source earthquake can bcused to determine the crustal and up -mantle structures of P and S-wave velocityunder the condition that a homogeous, isotropic layered model is a reasonableapproximation to the real structure to be infered' Data recorded by mobile stations atTian-shan mountain area, Xinjing Uygur Autonomous Regi0n for deep soundingwith the method of PS converted waves of earthquakes are selected and uti1ized to de-tect P and S wave velocity structures by using 0f the waveform inversion' Six veloci-ty models are provided in this paper. |
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| Keywords: | Full waveform inversion SUMT method Velocity structure Deepsounding by converted waves of earthquakes Tan-shan mountainarca |
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