摘要
本文针对天然地震波形反演面临的困难及其复杂性，提出了逐步波形反演方法。第一步，运用波形反演中的试错法，求得地震台站下方成层介质的初步结构；第二步，以第一步结果为初值，令各层厚度不变，反演速度；第三步，以第二步结果为初值，令速度不变，反演厚度。以上各步还可交替进行，直至得到满意结果。我们还给出了反演实例，将该方法应用于实测数据，并利用深源远震波形反演求出了东北地区壳幔介质结构，且获得了莫霍面的三维立体图像。
In this paper, author put forward progressive inversion algorithm of waveform for difficuty and complexity of seismic waveform inversion. It was studied three concrete stepsused waveform progressive inversion crust and upper medium struction of deep-focus teleseismic P waveform.1. Inversion crust and upper mantle medium layered structure beneath the seismicrecord stations with the trial method of the waveform inversion;2. On base of the result 1., fixing every layer thichness, inversion different layer velocity veines with vector wave eqation;3. Fixing every layer velocity and imaging medium hiatus surface, inversion differentlayer thickness values by means of the wave-field inverse reconstruct calculated formula.Step 1., 2., 3. can be used in turn till satisfied results. Author also gave examples,reversed and calculated with collecting waveform data of the pratical observation recordsfrom 11 seismic stations in the region of the Northeasten China,then resulted the crust andupper mantle medium structure parameter values and Moho interface image in this region,and the results is fairly good.
出处
《中国地震》
CSCD
北大核心
1994年第3期230-237,共8页
Earthquake Research in China
关键词
逐步波形反演
试错法
壳幔介质结构
地震波
Progressive wavaform reversion, Trial method, Inversion of velocity values, Inversion of thickness values, Crust and upper mantle medium structure
