TABLE B9: ESTIMATED MEAN MAGNITUDES FOR 150 YEAR RETURN PERIOD SPECTRAL ACCELERATIONS Intensity Parameter Mean Magnitude (Mw) PGA 6.3 SA(0.5s) 6.4* SA(1.0s) 6.7* *Visually estimated from GNS 2017 deaggregation plots (Figures B3 and B4) 6.2. 2500 year return period earthquake event The 2,500 year return period uniform hazard spectrum is shown in Figure B6 and the Figure B7, Figure B8 and Figure B9 for PGA, SA(0.5s) and SA(1.0s), respectively. The mean magnitude of the deaggregated earthquake sources for PGA (Peak Ground Acceleration) is provided by GNS (Ref. 1), however, not for SA(0.5s) and SA(1.0s). These have been visually estimated as summarised in Table B10 by EGL for use in estimating co-seismic displacement. FIGURE B6: 2500 YEAR RETURN PERIOD RESPONSE SPECTRUM
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