What is Zone Classification?

Obsolete versions of seismic standards used to classify seismic areas ranging from zone 0 to zone 4, where zone 0 indicates the weakest earthquake ground motion and zone 4 indicates the strongest. The zone classification is no longer used. The current standards specify the Sds design earthquake spectral response acceleration parameter as described above.

Please refer link https://seismicmaps.org/ to determine the Sds criteria for a specific location.