Signs of liquefaction from the Lake Hamilton sediments indicate possible earlier earthquakes

Mike Scott / FAIRFAX NZ

Lake Rotorua is one of the Hamilton lakes that the researchers took basic samples from

Core samples from 20,000-year-old sediments from three Hamilton Lakes show signs of possible liquefaction, which may be indicative of past earthquakes.

Researchers began collecting core samples last month from Rotorua (Lake Hamilton), Rotokayo (Lake of the Forest), and Waiwakarik (Horseshoe Lake).

Professor David Lowe, chair of the Earth Sciences team at the University of Waikato, said that depending on the findings of the work, low to moderate earthquake risks in Hamilton may have to be reviewed.

The researchers who collected the samples come from the university, GNS Science and the Cawthron Institute, and in addition to studying prehistoric earthquake activity, they are researching the history and health of the lakes.

Read more: * Scientists have begun mapping Lake Wanaka in search of an active fault * Lake Rotorua: An ancient lake returning again * Scientists have discovered a possible fault line under Hamilton

They found that five layers of volcanic ash – called tephra – in the sediments showed signs of possible liquefaction, a phenomenon seen during the Christchurch earthquakes as the sediments behave like a liquid.

John Kirk Anderson / Staff

Alan and Joan Slate won a lawsuit over a bad earthquake repair of their Christchurch home.

“The features of these layers mean that one or more local faults may be responsible for previously unrecognized earthquakes in the Hamilton lowlands over the past 20,000 years,” the university said.

About 30 lakes dot the Hamilton faults, and cores from those lakes will be used to create an image of the faults that may have been active in the past.

“By studying the nature of tephra layers using tomography and geotechnical methods, we aim to calculate the intensity of vibration and develop a new understanding of seismic hazards in and around Hamilton,” said Lowe.

Layers of ash were deposited in the lakes during volcanic eruptions in such volcanic centers of Taupo, Akatina, Tongariro Ruapehu, Taranaki and Tohoa (Mayor Island).

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