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I thought it would be interesting to review some of the activities that archaeologists and conservators have been involved in within Christchurch this past week.  This information has been collated from a variety of sources, if there is any misrepresentation or inaccuracies please let me know.  If there anything to add to this, it would be great to hear it.

 Since the beginning of the recovery period of operations it has been noticeable that a more business like tone has been given to reporting.  So what is happening?

Statistics and Lists

CCC Media Release, March 14: a total of 837 protected heritage buildings in Christchurch have been assessed since the 22 February earthquake. Of those, 338 have received red placards, 24 of which have been approved for deconstruction. 

  • Like it or not, lists allow for accountability, and give people a sense of the current state of affairs.  The Rebuilding Christchurch website also seems to be a good source of information regarding the sceduling of heritage deconstruction.  It is inknown if it is being updated regularly.

 The Authority Process

Since the earthquake in September 2010 there has been emergency provisions in place to speed up the authority process (the permit required to modify, remove and investigate protected heritage and archaeology).  The emergency authorities allow the deconstruction of built heritage for the reasons of safety, but does not allow for any sub-surface investigations.  Once deconstruction or demolition is complete, a new authority is required to establish the presence and condition of sub-surface remains. 

  • Information to inform the authority process is being collated by heritage specialists, engineers, council members and archaeologists, such as those with NZHPT. This is likely to occur when decisions regarding rebuilding are made.  Current authorities being issued are to allow deconstruction/demolition.

 Deconstruction and Demolition

In the cordoned area within Christchurch city and outside the process of deconstruction is underway.  The deconstruction phase of works is to ensure that sections of buildings considered unsafe or unstable be removed. 

  • This is being monitored by archaeologists,
  • It is understood that the fabric and materials from the heritage buildings being deconstructed are being labelled, piled separately and retained for potential later use. 

Demolition suggests complete removal of a heritage building. 

  • Some buildings have been assigned to demolition, such as the Time Ball in Lyttleton.  See the Rebuilding Christchurch Website.

 Monitoring

This is standard practise on any archaeological site or area of significant cultural or heritage value where a digging machine is used to remove overburden, non-archaeological layers or disturbed material such as building collapse.  Recording through photography is conducted, with survey to enable location of the feature/building being monitored.  If safety allows, sampling of the fabric, building materials or artefacts may occur.

  • 2 archaeologists have been employed by New Zealand Historic Places Trust to monitor the deconstruction of the heritage buildings. 

 south quad of arts cnetr

 Above: An image of the South Quad of the Arts Centre after the Observatory tower collapse.  This is a good example of the working conditions archaeologists are in, and some of the difficulties of monitoring and recording the heritage. Thanks to Bridget for the photo.

 Recording and Preservation

An essential part of the archaeological process…this is the information that creates the archive, and acts as a form of preservation, aka known as preservation by recording.  Whilst standard practise in any archaeological works it can be conducted on different levels. In this instance:

  • Basic recording includes photography, written descriptions, location or survey.
  • Recording associated with the preservation or conservation of heritage buildings.  This may include condition assessment, drawings, survey, scanning and sampling.  Sampling preserves the knowledge of the original materials, allowing for possible future elemental analysis and reconstruction with like materials.  Likewise, saving the original materials during deconstruction enables later reconstruction.   There is international precedence where intact buildings can be deconstructed and labelled to reconstruct in the same way in the future. This is occurring where the fabric of heritage building are being retained (see above).
  • Recording associated with the conservation of artefacts is also occurring.  The time capsules, 1 glass bottle and 1 copper alloy tube, are currently being curated by the Christchurch Museum.  A paper and an objects conservator will be responsible for the stabilisation and treatment of the capsules and their contents.  It is understood from the museum website that the copper alloy capsule remains unopened.

 Preservation and Computer Visualisation

  • When a site or building has been affected beyond repair, and cannot be saved, digital methods of recording can generate virtual reconstructions of buildings and sites .  Prior to building or site demolition/deconstruction, recording using lasers in 2-d and 3-d can lead to 3-d visualisation creation.  The building no longer exists, but virtual reconstruction enabling people to walk about the interior and exterior through computer use. At present, remote sensing Lidar and 3-d scanning equipment are heading to the Time Ball in Lyttleton to record this iconic building before its demolition next week.  Perhaps soon we can all walk around and inside the building with the use of virtual technology and visualisation.

 Other methods of recording and technology exist in archaeology but these have been identified as most relevant in this situation.  This is also not an exhaustive list of archaeological activities occurring at present.  Any additions or relevant comments are welcome!