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Research Papers, Lincoln University

We examined the stratigraphy of alluvial fans formed at the steep range front of the Southern Alps at Te Taho, on the north bank of the Whataroa River in central West Coast, South Island, New Zealand. The range front coincides with the Alpine Fault, an Australian-Pacific plate boundary fault, which produces regular earthquakes. Our study of range front fans revealed aggradation at 100- to 300-year intervals. Radiocarbon ages and soil residence times (SRTs) estimated by a quantitative profile development index allowed us to elucidate the characteristics of four episodes of aggradation since 1000 CE. We postulate a repeating mode of fan behaviour (fan response cycle [FRC]) linked to earthquake cycles via earthquake-triggered landslides. FRCs are characterised by short response time (aggradation followed by incision) and a long phase when channels are entrenched and fan surfaces are stable (persistence time). Currently, the Te Taho and Whataroa River fans are in the latter phase. The four episodes of fan building we determined from an OxCal sequence model correlate to Alpine Fault earthquakes (or other subsidiary events) and support prior landscape evolution studies indicating ≥M7.5 earthquakes as the main driver of episodic sedimentation. Our findings are consistent with other historic non-earthquake events on the West Coast but indicate faster responses than other earthquake sites in New Zealand and elsewhere where rainfall and stream gradients (the basis for stream power) are lower. Judging from the thickness of fan deposits and the short response times, we conclude that pastoral farming (current land-use) on the fans and probably across much of the Whataroa River fan would be impossible for several decades after a major earthquake. The sustainability of regional tourism and agriculture is at risk, more so because of the vulnerability of the single through road in the region (State Highway 6).

Videos, UC QuakeStudies

A video of an interview with John Haynes, about his experiences during the 22 February 2011 earthquake. Haynes was in the Forsyth Barr building when the earthquake struck. Using his skills as trained mountain guide, Haynes belayed fourteen people down three and a half floors to safety.

Audio, Radio New Zealand

Film and TV reviewer Perlina Lau joins Kathryn to talk about murder mystery The Perfect Couple (Netflix), starring Nicole Kidman and Eve Hewson. She'll also talk about documentary Maurice and I (cinemas) that celebrates Sir Miles Warren and Maurice Mahoney's hugely influential architectural partnership, and impact the Christchurch earthquakes had on their legacy. And A Very Royal Scandal (Prime Video) is the second recent production that goes behind the scenes of the damaging interview Prince Andrew gave over his friendship with Jeffrey Epstein. Perlina Lau is co-host of RNZ's Culture 101 programme.

Audio, Radio New Zealand

Is Christchurch about to dethrone Wellington as the country's new capital of cool? Locals say Otautahi is becoming a hipper, more culturally vibrant place after it was devastated by earthquakes more than a decade ago. University students are coming in their droves, with the city offering affordability and an abundance of things to do, Adam Burns reports.