SeisMike finds most of its applications in the pavement investigation, and deals with very-high-frequency (VHF) seismic surface waves (e.g., 30 kHz), called Lamb waves. Therefore, a small impact source is used. Among many such sources tested (e.g., small carpenter hammer, bolt and nuts, metal balls, etc.), a pinball, 1 1/16 inch (2.7 cm), generates the most optimum frequency spectrum with strong and broadband nature. The acquisition method is based on the multichannel analysis of surface waves (MASW), which utilizes a common multichannel engineering seismograph (e.g., 24-channel), recording in its highest sampling rate (64 kHz). A short recording time (e.g., 5-ms) is usually sufficient. The measurements are made at multiple locations along a preset linear survey line (e.g., 5 m) with a preset survey interval (e.g., 0.3 m), while maintaining the same acquisition parameters. The purpose is to generate a 2D shear-wave velocity (Vs) and subsequent modulus (e.g., Young’s and shear) cross sections.
