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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.
Using natural seismic records, the waveform information of the direct P wave in the past 20 s is recorded. The method, uniqueness, precision and problems to be solved for the inversion of the slow velocity of crust and land are studied. The method of solving the penalty with conditional extremum and solving The simplex method with unconditional extreme value is introduced into the waveform inversion. The numerical results show that the waveform inversion method can suppress the error of the recording. Under the condition that the depth of the deep source, the teleseismicity and the isotropic layer are approximate reasonable, Seismic events in the ray plane of the two component records inversion of the crust, upper mantle P, S velocity structure.In the Tianshan region of Xinjiang conversion wave mobile station observation, choose a better record for waveform inversion, give The crust and upper slow-velocity P and S-wave velocity structures beneath the 6 stations on the converted depth profile are shown.Comparison of waveform inversion and seismic exploration results at a measuring point in the Tarim Basin shows that the waveform inversion method Satisfactory accuracy.