Shear-wave velocities from multi-station analysis of surface wave

Abstract

Site characterization using surface waves is becoming more and more popular because of its advantages over intrusive methods. Multi-station methods are presented to recommend a better procedure to construct the experimental dispersion curve including data acquisition, test configuration, and data analysis. A method based on the linear regression of phase angles measured at multiple stations are proposed for determining data quality and filtering criteria. This method becomes a powerful tool for on site quality control in real time. Multi-channel recording permits single survey of a broad depth range, high levels of redundancy with a single field configuration, and the ability to adjust the offset, effectively reducing near field effect, far field effect, and other coherent noise introduced during recording. The effects of multiple modes and survey line parameters, such as source offset, receiver spacing, and total length of the survey line, are investigated. The parametric study results in a general guideline for the field data acquisition. A case study demonstrates how to easily deploy commonplace seismic refraction equipment to simultaneously record data for P-wave tomographic interpretation and multi-station analysis of surface wave.