Plate Boundary

What’s on our Plates?

Researching tsunami deposits on the East Coast

New Zealand has thousands of active faults each of which will produce an earthquake of some magnitude when it ruptures. However the two giants are the Alpine Fault and the Hikurangi Subduction Fault. They each form a segment of the plate boundary – the Alpine Fault can be traced across land, the length of the South …

What’s on our Plates? Read More »

Imaging the Crust beneath Wellington

Having had a close up look to the surface trace of the Wairarapa Fault (see recent post here), I thought it would be interesting to find out the latest about what such a major geological structure looks like below the earth’s surface. Stuart Henrys and colleagues at Victoria University, the University of Tokyo, Japan, and …

Imaging the Crust beneath Wellington Read More »

Shooting the SAHKE Seismic Survey across the North Island

The blasts from the seismic survey were detectable by GeoNet as very small local ground tremors along the seismic line last week:                    PRELIMINARY EARTHQUAKE REPORT                             GNS SCIENCE            …

Shooting the SAHKE Seismic Survey across the North Island Read More »

SAHKE – Seismic Array Hikurangi Experiment

About a dozen field teams have been out over the weekend  deploying geophones along the 90 kilometre transect of the SAHKE seismic survey. The first photo shows some of the Orica contractors  loading and priming one of the transect shot holes. 500 kilogrammes of explosive emulsion is being pumped down a 50m bore hole. The …

SAHKE – Seismic Array Hikurangi Experiment Read More »

Wellington’s Stuck Plate Boundary

Ever since 1855, when New Zealand’s largest ever recorded earthquake (magnitude 8.1) shook the Wellington Region, a lot of effort has gone into understanding the earthquake risk in and around New Zealand’s capital city. There are several large fault lines in the area, including the Wellington Fault. This is the most active fault of the …

Wellington’s Stuck Plate Boundary Read More »

Kermadec Arc Videos

Our expedtion to explore the hydrothermal activity and mineralisation of the Kermadec arc volcanoes is now over. We arrived back in Auckland yesterday, after a successful three week research cruise. Amongst the discoveries that were made were areas of present day and ancient hydrothermal activity, relatively fresh lava flows from previously uninvestigated volcanic craters, and …

Kermadec Arc Videos Read More »