Monitoring earthquakes
Increasing earthquake activity is one of the signs of
magma (molten rock within the earth) moving up to the
surface. There is a network of seismographs, which
measure earthquake activity, at sites where volcanic
eruptions are likely. A protective box surrounds this
seismograph (foreground) in a remote part of Tongariro
National Park, with Ruapehu in the background. The
results are telemetered to GeoNet headquarters, where any
changes in activity are monitored. Power is provided by a
solar panel (centre).
