Two quakes for Auckland

Published: Sun Mar 17 2013 10:00 AM

Two earthquakes this afternoon shook the greater Auckland city region. No serious damage is expected.

The first, a magnitude 3.1 event, occurred at 4:01 pm; it was followed at 4:05 pm by a magnitude 3.9 quake. The accompanying map shows their epicentres were in the vicinity of Motutapu Island.

Map showing the epicentres of the two quakes near Auckland. The larger one is highlighted.

Map showing the epicentres of the two quakes near Auckland. The larger one is highlighted.

They both occurred at comparatively shallow depths, about 5 km below the surface. They will have been felt very sharply by people, but not widely, and any felt reports much beyond greater Auckland are unlikely to be verified. The latter earthquake would not feel dissimilar to some of the larger aftershocks Christchurch folk have felt over the past few months, such as this magnitude 3.9 on February 22 2013.

Our Wairakei-based Duty Volcanologist does not see any evidence from the characteristics of the seismic waves that they are related to volcanic activity, nor are the earthquakes large enough to generate a tsunami.