A 100-year-old woman pulled alive from the rubble of her farmhouse had lived on the homestead for 64 years.

Margaret Edgar was asleep inside the Elms homestead near Kaikoura with her son and daughter-in-law when the enormous 7.5 tremor struck early on Monday.

The impact of the quake not only completely destroyed her 20-room farmhouse, but also caused all three inside to be trapped beneath the rubble.

Sadly the collapse killed Ms Edgar's son Louis, however she and her daughter-in-law managed to be pulled alive from the rubble by rescue crews after a lengthy search.

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The centenarian had lived at the popular Elms homestead since 1952, Fairfax reported.

Ms Edgar had reportedly run a camp at the property with her son and daughter-in-law.