Wind Farm Seismic Site Classification

CSR GeoSurveys Ltd. was contracted to conduct geophysical investigations at three proposed wind farm sites in Nova Scotia. The investigations were undertaken to support geotechnical design requirements for wind energy infrastructure development at 37 survey locations identified by the client.

The objective of the investigations was to determine seismic site classifications (Vs30) at each survey location in accordance with National Building Code of Canada (NBCC) requirements. 

Survey Methods

One-Dimensional Multi-Channel Analysis of Surface Waves (1D-MASW) surveys were conducted to evaluate subsurface shear wave (S-wave) velocity characteristics at each survey location. 

Field data were collected using a 24-channel Geometrics Geode seismograph, 4.5 Hz geophones, and a PEG-40 accelerated weight drop seismic source. 

Data Interpretation & Results

MASW data were processed to generate S-wave velocity profiles and corresponding Vs30 estimates for each survey location. The results were interpreted in accordance with the NBCC site classification criteria to assign seismic site classes across the proposed wind farm sites.

The investigation provided subsurface information to support wind turbine foundation design and geotechnical assessment for the proposed developments.