TEPHRA SEISMITES

Evaluating earthquake hazards using liquefied volcanic-ash layers in lakes

Lake Ngaroto (photo by F van Schie)

Latest Updates

Participation at QuakeCoRE Annual meeting

Tephra Seismites PhD student Jordanka Chaneva attended the QuakeCoRE Annual meeting in Napier between 29th August to 1st September 2022. She presented part of the on-going triaxial testing research through a poster entitled “Cyclic undrained behaviour and liquefaction resistance of pumiceous, non-plastic sandy silt”. The poster-abstract is now available to read at: http://www.quakecore.nz/wp-content/uploads/2022/08/2022-Abstract-Book-FINAL.pdf

Tephra Seismites group seminars

The Tephra Seismites team at Waikato held a half-day meeting today to present progress on different aspects of the project, and discuss next steps.  Josh presented preliminary results from paleoseismic trenching and geomorphology of the Te Puninga Fault segment, Hamilton lowlands. Richard, in his talk on ‘Soft sediment deformation structures (SSDS) in Rotoroa/Hamilton Lake’, presented observations … Continue reading Tephra Seismites group seminars

Second newsletter

A short newsletter on research progress was recently emailed to partners, supporters and stakeholders, and can also be viewed below. If you’d like to receive any future updates directly, please feel free to contact us.

Project Summary

Liquefied volcanic-ash layers (‘tephra seismites’) preserved in lake sediments have never been reported. In northern New Zealand we have identified at least four such seismites in tephra-bearing lakes aged ~20,000 years in the Hamilton Basin. Our aim is to use this unique opportunity to develop a novel methodology to evaluate the frequency, possible magnitude, and likely locations of major earthquakes for the past 20,000 years in the basin. Click here to continue