Everything you need to know about a Lahar
2:29 PM Sunday Mar 18, 2007
The red pointer shows where the Crater Lake on Mt Ruapehu gave way forming a lahar which cascaded down the mountain. Photo / Greg Bowker
DoC have confirmed a moderate lahar is underway, after alarms were activated on Mt Ruapehu's crater lake today.
But what is a lahar - is it the same as a volcano? What causes them, and, more importantly, how prepared are we?
Here is a series of previous stories the Herald has done analysing a lahar from Ruapehu.
PHOTOS: Scientists polish up crisis threat for lahar
Lahar alert rises
Crater under surveillance
First testing of the lahar alarm system, from 2004
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