Lessons from Japan will aid NZ research

University of Otago geologist Dr Virginia Toy undertakes research aboard  Japanese research...
University of Otago geologist Dr Virginia Toy undertakes research aboard Japanese research vessel Chikyu. Photo supplied.
A record-breaking drilling expedition off the coast of Japan will shed more light on the causes of last year's devastating tsunami, and also benefit New Zealand earthquake research, Dunedin researcher Dr Virginia Toy says.

Late last month, the research vessel Chikyu, with Dr Toy aboard, drilled to about 7740m below sea level and about 850m into underlying rock in a deep-sea trench area, about 6910m deep, off the Japanese east coast.

The expedition, known as "Expedition 343: Japan Trench Fast Drilling Project", ended late last week at a drilling site about 200km east of the Oshika Peninsula, in northeast Honshu.

Dr Toy is a lecturer in the University of Otago geology department and co-principal investigator in an international Southern Alps quake-related drilling project.

Expedition staff had aimed to drill through the Japanese subduction zone fault which was active in the magnitude-9 quake on March 11 last year , organisers said. That quake generated a tsunami which killed more than 20,000 people.

The expedition had to contend with powerful spring storms and huge technical challenges linked to extreme deep-sea drilling.

Technical problems meant planned installation of temperature sensors at the drill site have had to be delayed.

Dr Toy said it had been "absolutely excellent" that the initial drilling goals in the internationally collaborative "Integrated Ocean Drilling Programme" project had been met, and she had found her own involvement "very, very valuable".

She had learned much which could be applied to the Alpine Fault project in New Zealand.

john.gibb@odt.co.nz

Add a Comment

Local journalism matters - now more than ever

As the Covid-19 pandemic brings the world into uncharted waters, Otago Daily Times reporters and photographers continue to bring you the stories that matter. For more than 158 years our journalists have provided readers with local news you can trust. This is more important now than ever.

As advertising drops off during the pandemic, support from our readers is crucial. You can help us continue to bring you news you can trust by becoming a supporter.

Become a Supporter