What lies beneath? Finding faults via ancient topography

A detailed study of the ancient and modern topography of New Zealand’s most populous city, Auckland, has revealed significant concealed fault offsets beneath the region’s volcanic field deposits.

Borehole and geophysical data combined with structural information from current topography and exposed geology have helped lead to the findings.

The resulting block-faulting model supports a proposed connection between the position of the junction magnetic anomaly and Auckland volcanism.

The identification of several possible faults in the area covered by the Auckland Volcanic Field may indicate more structural control on volcanism than had previously been considered.

Tags:AucklandAuckland Volcanic Field (AVF)block faultingborehole analysisconcealed faultsfaultsfieldgeologyJunction Magnetic AnomalymagneticpublicationsstructuraltopographyvolcanicWaitematā Group erosion surface