New Zealand: two volcanoes erupt within 48 hours

An exciting few days for New Zealand geologists.  Over 48 hours, two volcanoes in New Zealand have had minor eruptions. Early on Sunday morning (04.55 NZST on 5 August), White Island had a small explosive eruption. The eruption was captured on one of the webcams located in the crater area.  White Island is New Zealand’s most active volcano, having been in frequent eruption between 1976 and 2000, though recently quiet.

Video of eruption:
http://geonet-shakennotstirred.blogspot.co.nz/2012/08/white-island-eruption-video.html

The volcanic alert level was raised to 2 and aviation colour code to orange.

Less than 48 hours later, Tongariro had a phreatic eruption at 23.50 on 6 August, its first eruption in 115 years. The eruption lasted a couple of minutes and light ashfall was deposited to the north east of the volcano, closing roads and cancelling domestic flights. This followed an increase in seismic activity over the previous 3 weeks.

NASA Earth Observatory image showing eruption plume of Tongariro, Aug.7, 2012
NASA Earth Observatory image showing eruption plume of Tongariro, Aug.7, 2012

https://www.facebook.com/#!/geonetnz

The volcanic alert level was raised to 2 and aviation colour code to red, although the latter was reduced to orange after 12 hours as activity seems to have subsided.  Here’s a link to the hazard map of Tongariro.

http://www.geonet.org.nz/content/download/7673/45005/file/Tongariro_Poster_A4.pdf

Volcano Map of New Zealand
Locations of active volcanoes in New Zealand. USGS graphic.

Eruption info from GNS Science, New Zealand and NASA EOS.