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本文从四川地震工作的实际出发,通过理论模型计算,论证了在地形起伏较大的丘陵山区剩余静校正是影响叠加速度精度的重要因素之一。为了提高叠加速度的精度,获得较高精度的速度谱,应该采取速度谱—剩余静校—速度谱的循环迭代处理方法。在此基础上,对实际地震资料进行了试处理,并对反褶积、一次剩余静校、二次剩余静校后的速度谱进行了比较,计算了均方差,取得了与理论模型基本一致的结果。文章最后介绍了实现该方法的处理流程和参数选择问题。本文提出的方法简单易行,完全可以在小型计算机上实现。
Based on the actual earthquakes in Sichuan Province and through theoretical models, it is demonstrated that residual static correction in hilly and mountainous areas with large topography is one of the important factors affecting the accuracy of superposition velocity. In order to improve the accuracy of the stacking speed and obtain a high-precision speed spectrum, a cyclic iteration method of speed spectrum-residual static-speed spectrum should be adopted. On this basis, the actual seismic data were tested and the velocity profiles of deconvolution, the first residual statics and the second residual statics were compared and the mean square error was calculated, which was basically the same as the theoretical model the result of. At the end of this article, we introduce the process flow and parameters selection to realize this method. The method proposed in this paper is simple and easy to implement in a small computer.