Civil Defence says just one in 10 Auckland families is prepared for a major disaster.
Two shallow earthquakes - a 3.1 followed four minutes later by a 3.9 - shook the city on Sunday afternoon, startling many residents.
The Auckland Civil Defence controller, Clive Manley, says a survey Civil Defence conducted shows Auckland families are the least prepared in the country for major events, although most are aware they need to work out a survival plan.
Mr Manley says residents in rural areas are often better prepared than those in the city, because they are accustomed to power not being as reliable as in urban areas.
He says people should have enough food, water and first aid supplies for three days.
Meanwhile, scientists are confident the quakes are not a sign of volcanic activity.
A magnitude 3.9 quake was recorded at 4.05pm at a depth of 6km and was centred 15 kilometres north-east of the city. Four minutes earlier a 3.1 quake was recorded in the same spot, and was only 4km deep.
Albany resident John MacNaughtan says they began with a rumbling sound, as if a heavy lorry was going down the road, and a short time later everything shook for a few seconds.
GNS Science volcanologist NicoFournier told Radio New Zealand's Morning Report the quakes were centred on Motutapu Island in the Hauraki Gulf.
He says in theory an earthquake could affect a volcano, either triggering or stopping activity, but in this instance neither has happened.
Earthquakes are rare in Auckland and Mr Fournier says the last time something similar was felt was 2007.
