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.

Tori and Max at the sampling site

We found Tuhua (Mayor Island) tephra (7.6 cal ka) and Mamaku tephra from the Okataina caldera (8.0 cal ka), which are the upper and lower tephras respectively in the photo below. Jordanka will be using these in her geomechanical tests.

Tuhua (upper) and Mamaku (lower) tephras in lake sediment

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