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Images for Earthquake aftershocks; more images...

Images, eqnz.chch.2010

A few older Christchurch Earthquake Pics from after the 6.3 last Feb (2011). And yes the aftershocks are still happening.. Twitter | Facebook |

Images, eqnz.chch.2010

A few older Christchurch Earthquake Pics from after the 6.3 last Feb (2011). And yes the aftershocks are still happening.. Twitter | Facebook |

Images, Alexander Turnbull Library

Text at the top of the cartoon reads 'NZ city strengthening?' A whole city enclosed in a glass dome and balanced on huge springs intended to make it earthquake resistant rocks as another aftershock hits. Context - Two earthquakes and hundreds of aftershocks have hit Christchurch, the first on 4 September 2010 and a second more devastating one on 22 February 2011. There has been great emphasis on making heritage buildings that are rebuilt and all new buildings earthquake resistant. The example in the cartoon is perhaps a Springs-with-damper base isolator. Quantity: 1 digital cartoon(s).

Other, National Library of New Zealand

CERA site which allows a check of the status of residental property in greater Christchurch in the aftermath of the series of major earthquakes and aftershocks which began in September 2010. Also has information about the zone classifications and FAQs.

Research papers, University of Canterbury Library

The current study examined the psychological effects of recurring earthquake aftershocks in the city of Christchurch, New Zealand, which began in September 2010. Although it has been identified that exposure to ongoing adverse events such as continuing terrorist attacks generally leads to the development of increasing symptomology over time, differences in perceived controllability and blame between man-made and natural adverse events may contribute to differences in symptom trajectories. Residents of two Christchurch suburbs differentially affected by the earthquakes (N = 128) were assessed on measures of acute stress disorder, generalised anxiety, and depression, at two time points approximately 4-5 months apart, in order to determine whether symptoms intensified or declined over time in the face of ongoing aftershocks. At time 1, clinically significant levels of acute stress were identified in both suburbs, whereas clinical elevations in depression and anxiety were only evident in the most affected suburb. By time 2, both suburbs had fallen below the clinical range on all three symptom types, identifying a pattern of habituation to the aftershocks. Acute stress symptoms at time 2 were the most highly associated with the aftershocks, compared to symptoms of generalised anxiety and depression which were identified by participant reports to be more likely associated with other earthquake-related factors, such as insurance troubles and less frequent socialisation. The finding that exposure to ongoing earthquake aftershocks leads to a decline in symptoms over time may have important implications for the assessment of traumatic stress-related disorders, and provision of services following natural, as compared to man-made, adverse events.

Images, Alexander Turnbull Library

Text at top left reads 'Earthquake... aftershock... or "new event"... one thing remains constant...' Below is a snail with 'EQC payments' printed on its shell. Context - This is a reference to the problems that Christchurch people are having in getting payments from the EQC (Earthquake Commission) Disgruntled tradespeople who are owed hundreds of thousands of dollars by EQC are considering legal action. Remaining unpaid can mean that companies may have to consider laying people off. The Amalgamated Workers Union says delays in EQC payments for housing repair work in quake-hit Christchurch are building to a crisis point. Two versions of this cartoon are available Quantity: 2 digital cartoon(s).

Videos, UC QuakeStudies

A video capturing an aftershock from the Canterbury earthquake on 26 December, 10:30 am. After a sharp aftershock in the morning, Ben Post set up the camera on a tripod and kept it running during the morning. The windows shown are approximately three metres square and double glazed.

Research papers, Victoria University of Wellington

Located on the edge of two tectonic plates, New Zealand has numerous fault lines and seismic risk across the whole country. The way this risk is communicated affects whether people prepare effectively or at all. Research has shown that perceptions of risk are affected by slight changes in wording, and that probabilities commonly reported by experts and media are often interpreted subjectively based on context. In the context of volcanoes, research has found that given a certain probability of a volcano in a specific time window, people perceive risk as higher in later time intervals within that window. The present study examines this pattern with regard to earthquakes and aftershocks in the New Zealand context. Participants in both Wellington (N = 102) and Christchurch (N = 98) were presented an expert statement of earthquake risk within a given time window in Wellington and aftershock risk in Christchurch, and asked to rate their perception of risk in specific intervals across the time window. For a Wellington earthquake, participants perceived risk as incrementally higher toward the end of the 50 year time window whereas for a Christchurch aftershock, risk perception increased slightly for the first three intervals of the 12 month time window. Likelihood of preparing was constant over the time windows, with Wellington citizens rating themselves more likely than Christchurch citizens to prepare for either an earthquake or aftershock, irrespective of current level of preparedness. These findings suggest that people view earthquakes as more likely later toward the end of a given time window and that they view aftershocks very differently to scientific predictions.