A pitfall in shallow shear-wave refraction surveying

摘要: The shallow shear-wave refraction method works successfully in an area with a series of horizontal layers. However, complex near-surface geology may not fit into the assumption That plane SH-wave undergoes wave-type conversion along interface nonhorizontal layers is theoretically inevitable. One real example shows that provides velocities converted wave rather than SH-wave. Moreover, it impossible to identify by data itself. As most geophysical engineering firms have limited resources, additional P-wave survey necessary verify if calculated from are waves. alternative at this time be surface method, which can provide reliable S-wave velocities, even velocity inversion (a higher layer underlain lower layer).