relevant eq information

In response to the recent earthquakes in Christchurch many organisations, including central government, local government and professional bodies, are developing new earthquake specific legislation and policies to guide engineers, designers, building owners and the public.  As this process is evolving with new information, it can be confusing.

In response to this Sidera has developed the following database of information.  This information is provided for information only. Please refer to a suitably qualified structural engineer for more detailed advice about your building.  If you need assistance locating an engineer, Sidera works in partnership with a number of engineering practices that we can put you in contact with.


Initial Evaluation Process (IEP)

The Initial Evaluation Process is intended to be a coarse screening process involving as few engineering resources as reasonably possible. The objective of the IEP is to identify, with an acceptable confidence level, all those buildings which will prove not safe in an earthquake. The IEP is typically followed by a more detailed assessment - for example a DEE.  

CERA have produced an IEP spreadsheet which suitably qualified structural engineers complete for individual buildings or structures.  This computation produces a figure (% of the New Building Standard -NBS), for each component of the building.  Based on this preliminary analysis the building can be categorised as vulnerable to earthquakes or not (less than 33% NBS).  

The following table shows the what actions are required once a %NBS is determined for your building.



Detailed Engineering Evaluation (DEE)

For a copy of the Structural Engineering Society of NZ SESOC DEE document click here.

The following table provides information on the timing for property owners to complete an IEP/DEE for their building.


Christchurch City Council/CERA

 The CCC and CERA have a number of documents that are relevant to the EQ rebuild process.  These include:



The following document has been produced by IPENZ, SESOC, Royal Society of New Zealand, New Zealand Geotechnical Society and the New Zealand Society for Earthquake Engineering, and it answers critical questions about buildings as they relate to the Canterbury Earthquakes.


Seismic Design In New Zealand

Over the years New Zealand has made a number of changes to its seismic design criteria.  These dates are relevant as they indicate what code your structure was designed to.  This is important in the IEP process.  The key dates are contained in this document.  

This document contains some more context courtesy of the Hutt District Council.