More Shake, Rattle And Roll in New Zealand
And now we have some more good news to share with you in the land of Hobbits and Middle Earth.
Scientists have raised the Volcano Alert Level at Mt Tongariro after a series of quakes beneath the volcanic complex. GeoNet said typically Tongariro experienced two such quakes – magnitude 2.5 or less – a year, but there had been more than 20 since July 13.
In a Volcanic Alert Bulletin issued this afternoon, it said the sequence started on July 13 and declined for a period, before restarting on July 18 and increasing in number yesterday.These earthquakes are small (magnitudes <2.5) and have only been well recorded by a few of the seismometers in our permanent network. The earthquakes cluster in a zone between Emerald Crater and the Te Mari craters at 2-7km depth. Tongariro is a massive complex of volcanic cones and craters formed by eruptions from at least 12 vents over more than 275,000 years ago. GNS Science volcanologist Brad Scott said the increased activity "just means that something has upset Tongariro, and some subterranean process is occurring". That's all very nice to hear but we have a fault line right through the country and underneath this volcano.....