Microtremor Survey Method is utilized to map the near-surface velocity structure for a proposed subway construction project in Shenzhen, China. Three components broad-band seismometers are deployed in circular arrays on multiple survey points along the subway line. The recorded microtremor ‘noise’ is processed using SPAC method to obtain phase velocity dispersion curve for the fundamental mode of Rayleigh wave and subsequently inverted for S-wave velocities. HVSR is analyzed to probe possible anomalous geological structures potentially disruptive to the boring process. In this study, it is demonstrated that phase velocities for the frequency range from 8Hz to 40 Hz can provide reasonable solvability for structures down to 30 m and map the bedrock topography. Profiling the phase velocity dispersion curve and HVSR along the survey line allows the provision of a snapshot of the geological structure beneath.
Presentation Date: Wednesday, October 17, 2018
Start Time: 1:50:00 PM
Location: 204A (Anaheim Convention Center)
Presentation Type: Oral