Polarization Filter Based on Linear Radon Transform to Extract Surface Waves in 3C Seismic Data

Abstract

Summary Polarization filters can be used when multicomponent seismic data are available. These filters can separate surface waves and body waves by discriminating between elliptical versus linear particle motion. The most important advantage of the existing polarization filters is that they work in single-station. Therefore, they are an alternative when surface waves are aliased. However, in most cases, polarization filters do not get better results than f-k filters because they do not operate in multitrace, and there is no velocity discrimination. We present a new polarization filter to extract surface waves from multitrace 3C seismic data. The filter works in the frequency-slowness domain as a mask on elliptic elements obtained from the linear Radon model of the seismic data in the frequency domain. We applied this filter on a 3C real shot gather from land seismic data acquired in the Middle Magdalena Valley in Colombia. The result shows that this polarization filter can extract the surface waves accurately.