An avid mountaineer who earlier survived eight days stranded high in the Southern Alps is missing again.
Marni Sheppeard was last heard from in Christchurch about 5.20am on November 19 before being reported missing last month.
Police were now calling for help from the public to locate the 53-year-old, who holds a PhD in theoretical physics.
She earlier posted a photo of herself to Twitter titled "off to the mountains", with police establishing she later took a bus west of Christchurch.
Her last recorded bank transaction was about 8.30am on November 19 at the Darfield Fruit and Vegetable Store in the small town of Darfield.