Reading a gravity meter.
For any geophysical survey it is important to know exactly where you are on the surface of the earth. We use gravity surveying for this.
The hole!
This was a really big bang!
We pushed the explosives down the holes we had bored.
Firing was by remote control,linked to a laptop.
The explosives looked like a roll of salami and were powerful enough to blow up a car! We had to have an explosives expert with us and wear safety vests!
We drilled holes for the explosives!
These are geophones that "read" the waves from the impact of the hammer or an explosion as if there was an earthquake.
The seismic survey was very exciting!
We used a line of geophones as sensors and used explosives and a sledge hammer hitting a metal plate as a seismic source
The students on the field trip.
Mount Ruapehu has a number of earthquake faultlines close by.
During the school holidays I joined 16 students and 4 staff on a field trip to learn how to design and conduct geophysical surveys in order to find out more about 3 earthquake fault lines in the area around the southern side of Mt Ruapehu. As well as this I was "Camp Mother"- responsible for keeping everybody well fed and happy - a big job in itself as the nearest shop was a 20 km trip away and field work makes everyone very hungry! The goal was to "do" scientific research by collecting some simple data sets on faults and compare the following methods-resistivity,seismic,magnetic and gravity.
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