"The February 22nd EQ has resulted in uplift of the Port Hills area. Preliminary field observations have indicated uplift in the southern part of the Avon-Heathcote Estuary and subsidence in the northern part. Etuaries have distinct tidal zonations that are recorded in a variety of flora and fauna.
The key research questions are how much uplift or subsidence has occurred, and how this may be recorded when there is no surface rupture observed associated with seismic events. This has potential to identify older sesimic events recorded within the estuary."