Rayleigh Wave Suppression Using Super-Virtual Interferometry Method

常规的瑞利波压制方法是利用瑞利波和有效波在频率或视速度方面的差异，对瑞利波进行分离和压制，在差异较小时，压制效果不理想。针对这一问题，引入超虚干涉法实现瑞利波压制。该方法是一种数据驱动的方法，不依赖频率和视速度信息，且对于复杂地表有较好的适用性。与传统干涉法只能预测检波点间的瑞利波并要求检波点附近存在真实炮点相比，超虚干涉法可以直接得到炮点至检波点的瑞利波，进而通过多道L1范数自适应相减法去除瑞利波。通过合成数据处理，利用该方法压制瑞利波取得一定的效果。Conventional Rayleigh wave suppression methods take advantage of differences in frequencies or apparent velocities between surface waves and effective waves to separate Rayleigh waves. However, the suppression may fail when the waves present small differences. To solve this problem, the super-virtual interferometry method is introduced to predict and suppress Rayleigh waves. It is a data-driven method, which is independent of frequencies or apparent velocities, and presents good applicability to complex near surface. Compared with conventional interferometry method which only predicts inter-receiver Rayleigh waves and requires a real shot around the receiver position, the super-virtual interferometry method is able to achieve shot-receiver Rayleigh waves, followed by adaptive subtraction using multichannelL1-norm. The synthetic data examples demonstrate the validity of the proposed method and obtain good results.国家科技重大专项; 国家重点基础研究发展计划中国科学引文数据库(CSCD)119-255