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Articles, Christchurch uncovered

As a Spanish archaeologist who used to work on prehistoric sites and then became an artefact specialist in New Zealand, my experience has shown me that although they are worlds apart, Spanish prehistory and the Victorian era are closer than … Continue reading →

Articles, Christchurch uncovered

Many of you will already know that Christchurch has a fascinating political history, from labour movements to radical social reform to the campaign for women’s suffrage. It is to my eternal disappointment that this “great ferment of ideas”, as Jim McAloon … Continue reading →

Articles, Christchurch uncovered

Anyone in the office will tell you that I have a keen interest in military history, especially anything related to the World War 2 period. I like my airplanes, yes (hats off to the de Havilland Mosquito, that twin engine … Continue reading →

Articles, Christchurch uncovered

The chilly weather in Christchurch of late has many of us dreaming of glistening seas, white sand beaches and pina coladas. A while ago, “winter is coming” gags were being fired about among the many Game of Thrones fans, and … Continue reading →

Articles, Christchurch uncovered

We all know that fish oil is great for our skin and hair but does the use of whale oil tickle your moral compass? It was utilised for many household purposes during the 18th, 19th and early 20th centuries and … Continue reading →

Articles, Christchurch uncovered

This week on the blog, a selection of chamber pots for your perusal, ranked according to my entirely objective, and not at all arbitrary, assessment of how fancy they are. This is accompanied by my very best attempt at using … Continue reading →

Articles, Christchurch uncovered

Here at Underground Overground Archaeology we try not to sweat the small stuff – particularly because the small stuff we find is often super cool and makes us say “aww, that’s cute!”, similar to the way many people react when … Continue reading →

Articles, Christchurch uncovered

Recently, Peter Mitchell, one of our building archaeology specialists, recorded a 19th century residential dwelling just on the edge of Christchurch’s Central City. This dwelling was similar in form and function to others we have seen in Canterbury – it … Continue reading →

Articles, Christchurch uncovered

At the turn of the 20th century, Christchurch’s rubbish disposal underwent a fiery transformation. After 50 years of settlement, Christchurch was facing a rubbish crisis that was starting to get people worried. The council’s weekly kerbside rubbish collection service, which … Continue reading →

Articles, Christchurch uncovered

Down on the corner of a Lyttelton street, there was a butcher, a courier and a large family to meet… Or at least, one could have met them about 150 odd years ago when three early settler families in Lyttelton … Continue reading →

Articles, Christchurch uncovered

It’s something so mundane that it forms a part of our everyday lives and it’s as inescapable as death and taxes. Even though we spoke of it last week on the blog, it’s something people don’t often speak about and … Continue reading →

Articles, Christchurch uncovered

This week on the blog, a bunch of teacups classified according to how cute I think they are. It won’t be as fun as talking to God on the porcelain telephone, but teacups also give us heaps of scope! Thinking … Continue reading →

Articles, Christchurch uncovered

Yet another year gone! It’s been a strange one, out there in the world, but here at Underground Overground it’s been a year of excavation, discoveries, stories and all things archaeological. In the proper spirit of history, let’s take a … Continue reading →

Articles, Christchurch uncovered

It’s that time of year again, the summer season is upon us, and this year has really has brought the heat! With much of the country sweltering in the late 20s and early 30s lately, it’s made us appreciate the … Continue reading →

Articles, Christchurch uncovered

During recent earthquake repairs at a residential property on well-known Sumner Road in Lyttelton, our archaeologists uncovered a small assemblage of artefacts that represented everyday Victorian household items. At first glance these appeared a somewhat ordinary – but when Lydia … Continue readi...

Research papers, University of Canterbury Library

Background Liquefaction induced land damage has been identified in more than 13 notable New Zealand earthquakes within the past 150 years, as presented on the timeline below. Following the 2010-2011 Canterbury Earthquake Sequence (CES), the consequences of liquefaction were witnessed first-hand in the city of Christchurch and as a result the demand for understanding this phenomenon was heightened. Government, local councils, insurers and many other stakeholders are now looking to research and understand their exposure to this natural hazard.

Audio, Radio New Zealand

Work has finally begun dismantling Lancaster Park in Christchurch, six years after it was damaged beyond repair in the February earthquake. It comes at the same time the city's leaders debate what a new stadium could look like and who will pay.

Audio, Radio New Zealand

A proposal to put houses back into Christchurch red zones is being shot down by some worried locals who say it's unfair and potentially unsafe. On Friday the crown-led agency, Regenerate Christchurch, released ten options for one area by the Avon river that 9 thousand people used to call home. Almost every house in the 602 hectare zone was demolished after the earthquakes.

Audio, Radio New Zealand

Some of the families of the 115 people who dies in the CTV building during the 2011 Canterbury earthquake protested in Latimer Square yesterday over the police decision not to prosecute the designers of the CTV building. They say they do want to see a prosecution go ahead, and they are seeking legal advice about what their options are.

Research papers, Lincoln University

The major earthquakes of 2010 and 2011 brought to an abrupt end a process of adaptive reuse, revitalisation and gentrification that was underway in the early 20th century laneways and buildings located in the south eastern corner of the Christchurch Central Business District. Up until then, this location was seen as an exemplar of how mixed use could contribute to making the central city an attractive and viable alternative to the suburban living experience predominant in New Zealand. This thesis is the result of a comprehensive case study of this “Lichfield Lanes” area, which involved in depth interviews with business owners, observation of public meetings and examination of documents and the revitalisation research literature. Findings were that many of the factors seen to make this location successful pre-earthquakes mirror the results of similar research in other cities. These factors include: the importance of building upon historic architecture and the eclectic spaces this creates; a wide variety of uses generating street life; affordable rental levels; plus the dangers of uniformity of use brought about by focussing on business types that pay the most rent. Also critical is co-operation between businesses to create and effectively market and manage an identifiable precinct that has a coherent style and ambience that differentiates the location from competing suburban malls. In relation to the latter, a significant finding of this project was that the hospitality and retail businesses key to the success of Lichfield Lanes were not typical and could be described as quirky, bohemian, chaotic, relatively low rent, owner operated and appealing to the economically important “Creative Class” identified by Richard Florida (2002) and others. In turn, success for many of these businesses can be characterised as including psychological and social returns rather than simply conventional economic benefits. This has important implications for inner city revitalisation, as it contrasts with the traditional focus of local authorities and property developers on physical aspects and tenant profitability as measures of success. This leads on to an important conclusion from this research, which is that an almost completely inverted strategy from that applied to suburban mall development, may be most appropriate for successful inner city revitalisation. It also highlights a disconnection between the focus and processes of regulatory authorities and the outcomes and processes most acceptable to the people likely to frequent the central city. Developers are often caught in the middle of this conflicted situation. Another finding was early commitment by businesses to rebuild the case study area in the same style, but over time this waned as delay, demolition, insurance problems, political and planning uncertainty plus other issues made participation by the original owners and tenants impossible or uneconomic. In conclusion, the focus of inner city revitalisation is too often on buildings rather than the people that use them and what they now desire from the central city.

Research papers, University of Canterbury Library

Damage distribution maps from strong earthquakes and recorded data from field experiments have repeatedly shown that the ground surface topography and subsurface stratigraphy play a decisive role in shaping the ground motion characteristics at a site. Published theoretical studies qualitatively agree with observations from past seismic events and experiments; quantitatively, however, they systematically underestimate the absolute level of topographic amplification up to an order of magnitude or more in some cases. We have hypothesized in previous work that this discrepancy stems from idealizations of the geometry, material properties, and incident motion characteristics that most theoretical studies make. In this study, we perform numerical simulations of seismic wave propagation in heterogeneous media with arbitrary ground surface geometry, and compare results with high quality field recordings from a site with strong surface topography. Our goal is to explore whether high-fidelity simulations and realistic numerical models can – contrary to theoretical models – capture quantitatively the frequency and amplitude characteristics of topographic effects. For validation, we use field data from a linear array of nine portable seismometers that we deployed on Mount Pleasant and Heathcote Valley, Christchurch, New Zealand, and we compute empirical standard spectral ratios (SSR) and single-station horizontal-to-vertical spectral ratios (HVSR). The instruments recorded ambient vibrations and remote earthquakes for a period of two months (March-April 2017). We next perform two-dimensional wave propagation simulations using the explicit finite difference code FLAC. We construct our numerical model using a high-resolution (8m) Digital Elevation Map (DEM) available for the site, an estimated subsurface stratigraphy consistent with the geomorphology of the site, and soil properties estimated from in-situ and non-destructive tests. We subject the model to in-plane and out-of-plane incident motions that span a broadband frequency range (0.1-20Hz). Numerical and empirical spectral ratios from our blind prediction are found in very good quantitative agreement for stations on the slope of Mount Pleasant and on the surface of Heathcote Valley, across a wide range of frequencies that reveal the role of topography, soil amplification and basin edge focusing on the distribution of ground surface motion.