CAJ | 학술논문

准确提取频散曲线是瑞雷波勘探的重要环节,检验各种频散曲线求取方法的正确性和稳定性至关重要.基于频散曲线,选择抽样脉冲信号作为子波,推导出了合成单炮面波地震记录的理论公式,并利用该公式,针对不同弹性层状介质模型的频散曲线合成了面波地震记录.通过对其波场特征对比和频谱分析,同时采用频率一波数域法反求其频散曲线,结果与模型频散曲线几乎相同,从而充分验证了该面波合成方法的正确性.
준학제취빈산곡선시서뢰파감탐적중요배절,검험각충빈산곡선구취방법적정학성화은정성지관중요.기우빈산곡선,선택추양맥충신호작위자파,추도출료합성단포면파지진기록적이론공식,병이용해공식,침대불동탄성층상개질모형적빈산곡선합성료면파지진기록.통과대기파장특정대비화빈보분석,동시채용빈솔일파수역법반구기빈산곡선,결과여모형빈산곡선궤호상동,종이충분험증료해면파합성방법적정학성.
Accurately calculating dispersion curve in Rayleigh wave exploration is an important step. It is vital to test the correctness and stability of various methods on calculating dispersion curve. This paper, based on dispersion curve, derives the theory formula of synthesizing single shot surface-wave seismogram, which selects sampling pulse signal as a wavelet, and surface-wave seismograms for dispersion curves of several elastic layered media are sythesised by the formula. It is sufficiently proved that the synthetic method is correct by wave field characteristic contrast, frequency spectrum analysis, and inversely calculated their dispersion curves by frequency-wave number analysis method, so this method provides a new theoretical principle and means to evaluate other methods of extracting dispersion curve.