It has been two weeks since the issue of a first phenomena map for the current volcano unrest period in the Te Maari area of Tongariro. As stated with that first release, the map will be revised as further scientific data, modelling and interpretation become available.
The science advisory group for this eruption, convened by GNS Science, have agreed that the volcanic phenomena map should now be updated as the result of further discussion and scientific input. In addition to GNS scientists, Department of Conservation, Massey, Canterbury, Victoria, Otago and Waikato universities have all provided input.
The following updates have been made to the phenomena map This replaces all previous map versions:
Taupo Civil Defence says the map update reinforces the advice for motorists not to stop along SH46. Debris from the recent eruption is blocking streams, meaning a significant volume of water has built up at various places.
Taupo Civil Defence emergency manager Phil Parker said: "Signs erected by NZTA are in place reminding people not to stop anywhere on SH46. Additional warning signage is also in place near a culvert on the highway, as this would carry the majority of any debris flows should the main debris dam collapse. NZTA has contractors monitoring the area extremely closely."
Mr Parker said devices to monitor movement in the main debris dam have been installed and are being tested by Massey University.
“Further work is planned to improve our understanding of the debris dams and how far material might go if the largest one collapses. At this stage, the debris would not be expected to affect any buildings but could affect SH46 within about 15 minutes of a collapse. We will review our advice – and what we plan to do - once we have the results of further analysis.”
For further information, contact:
Dr. Gill Jolly Head of Volcanology, GNS Science
Dr. Graham Leonard Volcanologist, GNS Science