Isn’t it reassuring that scientists are diligently watching New Zealand’s volcanic activity? This brings us to the Herne Bay Borehole. Auckland Council has detailed contingency plans for any volcanic disaster. Scientists constantly monitor the Auckland Volcanic Field using various tools. They can detect ground bulging by just a few centimeters.
Let’s delve deeper into the fascinating world of volcanic surveillance. The Herne Bay Borehole plays a crucial role in this monitoring network. It helps scientists understand what is happening beneath our feet. This borehole is not just a hole in the ground. It is a window into the Earth’s dynamic processes.
Consider this Auckland’s volcanoes are powered by low viscosity basaltic magma. This magma rises quickly through the crust. It moves at several kilometers per hour. When the next eruption happens we won’t get much warning. It could be tomorrow or in 4000 years.
Auckland could be affected by a volcano erupting outside the city. Taranaki or Ruapehu are possibilities. Even super volcanoes like Taupo Volcano could pose a threat. Ash has coated Auckland about once every 400 years over the past 12000 years. Ash is the volcanic hazard most likely to affect Aucklanders. It may seem harmless but it can cause a lot of damage.
The Herne Bay Seismogram Drum offers insights into seismic activity. You read a seismogram like you are reading these words. The earliest time is at the top left. It goes along the line to the end. Then it starts at the left of the next line. The top-left is therefore the oldest data. The bottom-right is the most recent. All the seismograms shown here cover a 24-hour period.
The odds are that a volcanic eruption won’t occur in Auckland during your lifetime. About 50 volcanoes have been produced over about 200000 years. That is one every 4000 years on average. We don’t yet know when many of these occurred. Current research aims to show whether eruptions have clustered in time.
Remember an eruption will almost certainly happen. It’s not a case of if but when. There is no way of knowing when it will happen. The last eruption Rangitoto was by far the biggest.
As you stand here at the Herne Bay Borehole appreciate the work being done. It is to keep our city safe. It’s a reminder that we live in a dynamic environment. Constant monitoring and research are essential. They help us prepare for any future volcanic events.