COMPARISON OF A CHRISTCHURCH-SPECIFIC CPT-VS CORRELATION AND VS DERIVED FROM SURFACE WAVE ANALYSIS FOR STRONG MOTION STATION VELOCITY CHARACTERISATION

The Christchurch-specific empirical correlation between shear wave velocity (V-s) and cone penetration test (CPT) data developed by McGann et al. [1-3] for the non-gravel soils of the Christchurch and Springston Formations is evaluated through comparison to V-s profiles obtained using surface wave analysis techniques at twelve Christchurch strong motion stations. These comparisons highlight the similarities and differences between the V-s profiles obtained from each approach, and allow for an assessment of the relative strengths and weaknesses of each. It is shown that, with known differences, the results of the surface wave analysis and CPT correlation compare well in terms of their independently obtained V-s magnitudes. The sources of the differences between the results of each method are identified and discussed.