TEPHRA SEISMITES

Evaluating earthquake hazards using liquefied volcanic-ash layers in lakes

Lake Ngaroto (photo by F van Schie)

Latest Updates

Tephra sampling fieldwork

Late last month, the Tephra Seismites team went to visit one of our field sites and collect tephra samples for lab testing, to better understand how and why they might liquefy in an earthquake. We found Tuhua (Mayor Island) tephra (7.6 cal ka) and Mamaku tephra from the Okataina caldera (8.0 cal ka), which are … Continue reading Tephra sampling fieldwork

PhD position available with the Tephra Seismites team

We are looking for a doctoral student to join our team, for a project on characterising and using liquefied lacustrine tephra layers to evaluate paleoearthquakes and seismic hazard in the Hamilton lowlands. The PhD project will involve (1) lake coring; (2) interpreting CT and micro-CT images of liquefaction of tephra layers in lake cores; (3) … Continue reading PhD position available with the Tephra Seismites team

Checking out Te Puninga Fault

From the week beginning 15 February, 2021, we have been taking part in a joint project investigating the newly discovered Te Puninga Fault near Morrinsville. This fault is the closest to the Hamilton Basin and so we are trying to work out if activity on the Te Puninga Fault may have impacted on Hamilton Basin, … Continue reading Checking out Te Puninga Fault

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