瑞利面波的频率相关性可用于对地下浅层的成像和描述。大多数的面波分析都取决于对水平旅行基型瑞利波的相位速度的准确计算(这是以计算地滚波波长为基础的一对接收器间隔所测得的)。相干震源产生的噪声干扰限制了由波场反演确定的横波速度的可靠性。在这些非平面波中,非基型瑞利波(噪声)是体波、发散的和非震源产生的面波及较高型面波。各类噪声影响发散曲线,和反演的横波速度剖面的程度最终取决于频率和与震源间的距离。 根据到达时间和振幅上的道间相干性,多道记录能对噪声进行有效识别和分离。另一优势表现在勘探过程的速度和冗余上。与非相关可控震源记录相似的时间变化频率中的多道记录分解能使每个频率分量以特有的连续性格式进行分析和演示。干扰混杂就能得以检验,其效应在频率和炮检距空间方面都能得以估价。频率分量的离散使信噪比在采集和后续处理过程中得到实时最大化。 每一地滚波频率分量的线性分隔能通过每个频率分量的线性斜率简单计算出相位速度。相干面波波至的中断,分解记录上的可视化都能对采集和处理起到辅助作用。多道记录使较宽深度范围的单次测量勘探、单个野外排列的高度重复性,调整炮检距的能力都能有效地减少记录中的随机或非线性噪声传入。 多道炮点道集的频率扫描记录能快 The frequency dependence of Rayleigh surface waves can be used to image and describe shallow subsurfaces. Most surface wave analysis depends on the accurate calculation of the phase velocity of the horizontal travel base Rayleigh wave, as measured by a pair of receiver spacings based on the calculated wavelength of the wave. The noise interference generated by coherent sources limits the reliability of the shear wave velocity as determined by wave field inversion. Among these non-plane waves, non-base Rayleigh waves (noise) are surface waves generated by body waves, divergent and non-focal sources, and higher surface waves. The extent to which various types of noise affect the divergence curve and the inverse of the S-wave velocity profile ultimately depends on the frequency and the distance from the source. According to the inter-channel coherence on arrival time and amplitude, multi-channel recording can effectively identify and separate the noise. Another advantage is reflected in the speed and redundancy of the exploration process. Multi-trace decomposition in time-varying frequencies similar to non-related vibrator records enables each frequency component to be analyzed and demonstrated in a unique, continuous format. Interference can be tested for promiscuity, and its effects can be valued both in terms of frequency and offset space. The dispersion of the frequency components maximizes the signal to noise ratio in real time during acquisition and subsequent processing. The linear separation of the frequency components of each roll can simply calculate the phase velocity by the linear slope of each frequency component. Coherent surface waves to the interruption, the visualization of decomposition records can play a supporting role in acquisition and processing. Multi-track recording effectively reduces the random or non-linear noise introduced into the record by enabling a single survey survey over a wider depth range, the high degree of repeatability of individual field arrangements, and the ability to adjust the offset. Multi-channel shot gather frequency sweep records faster