Tararua District Council (TDC) has funded this project to identify areas of land within the district that
have potential for liquefaction induced ground damage. The district spans across a variety of
landscapes that have varying vulnerability to liquefaction related hazards. Identifying areas of the
district that are prone to liquefaction induced damage will be beneficial for providing safe
communities within the district and allow planning to take place to identify areas for future district
growth. This assessment will significantly improve the understanding of liquefaction vulnerability in
the district and will produce a liquefaction hazard map that can be utilised by different stakeholders.
The outputs of the study will have two specific uses, the first being related to recent changes to the
Building Act and the second being Resource Management Act applications.This
report has been prepared for the exclusive use of our client Tararua
District Council, with respect to the particular brief given to us and
it may not be relied upon in other contexts or for any other purpose, or
by any person other than our client, without our prior written
agreement.Recommendations and opinions in
this report are based on data from individual CPT and borehole
locations. The nature and continuity of subsoil away from these
locations are inferred and it must be appreciated that actual conditions
could vary from the assumed model.The
susceptibility analyses carried out represent probabilistic analyses of
empirical liquefaction databases under various earthquakes. Earthquakes
are unique and impose different levels of shaking in different
directions on different sites. The results of the liquefaction
susceptibility analyses and the estimates of consequences presented
within this document are based on regional seismic demand and published
analysis methods, but it is important to understand that the actual
performance may vary from that calculated.This
assessment has been made at a broad scale across the Tararua District
and is intended to approximately describe the typical range of
liquefaction vulnerability across neighbourhood-sized areas. It is not
intended to precisely describe liquefaction vulnerability at individual
property scale. This information is general in nature, and more detailed
site-specific liquefaction assessment may be required for some purposes
(e.g. for design of building foundations).
