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对于测定浅海沉积层Q值的四种方法进行了比较:两种传统的方法,即上升时间法和频谱比法,两种新方法,即频谱模拟法和子波模拟法。而子波模拟法能同时测定Q值和反射时间T,比从地震图上读取反射时间T准确得多。上升时间法和频谱比法用于直接从资料得出Q值,两种模拟方法的原理是根据参考子波或它的频谱,对于不同的Q值来计算吸收效应和频散效应,实测资料与计算资料符合最好的就是最佳结果。用合成资料的数字检验表明:对于包含有噪音或叠加波至的资料,其精度很少有能够超过25％的;因此在任何情况下,子波模拟法是较好的方法,利用波罗的海一个垂直反射剖面的资料得出不同层的0值在15—100之间,这与本地区的沉积环境相符合。
Four methods for determining the Q value of shallow sea sediments are compared: two traditional methods, namely, the rise time method and the spectral ratio method, are two new methods, spectrum simulation method and wavelet simulation method. The wavelet simulation method can simultaneously determine the Q value and the reflection time T, which is much more accurate than reading the reflection time T from the seismogram. The rise time method and the spectral ratio method are used to derive Q values directly from the data. The principle of both simulation methods is to calculate the absorption and dispersion effects for different Q values based on the reference wavelet or its spectrum. The measured data Calculating the best match is the best result. Numerical tests with composite data show that for data containing noisy or superimposed waves, the accuracy is seldom greater than 25%; therefore, in any case, wavelet modeling is a good method of using the Baltic Sea vertical Reflectance profile data obtained for different layers 0 values ?? between 15-100, which is consistent with the sedimentary environment in the region.