Tongariro volcano news & activity updates
Tongariro volcano (New Zealand): small earthquakes
mardi août 06, 2013 07:27 | AUTEUR : T
Current seismic recording from Tongariro (GeoNet)During the past two weeks, GeoNet has been recording very small earthquakes beneath the volcano. The quakes were too small to be located but show up on local seismic stations.
GNS Science said the earthquakes could simply be part of the background unrest typical of most active volcanoes. However, in this case they are of interest at this time because there have been so few at Tongariro since November 2012 and potentially could signal changes occurring inside the volcano.
The amounts of carbon dioxide and sulfur gases emitted from Tongariro have remained at low levels since the start of this year and are about half the amount produced after the November 2012 explosion. These conditions, and the small number and small size of recent earthquakes are not sufficient to alter the unrest status of the volcano and GNS Science has not changed the Volcanic Alert Level from 1, or the Aviation Colour Code from Green.
Te Māri has had no eruptive activity since an explosion on 21 November 2012 although an eruption could still occur with little or no warning.
mardi, févr. 19, 2013
An increased number of earthquakes and possibly a weak tremor pulses appear on today's seismic recording. [details]
mardi, févr. 19, 2013
On 14 February GeoNet reported that Tongariro remained quiet with no eruptive activity being detected since the explosion on 21 November 2012. Steam-and-gas plumes rose from the Te Maari Craters, and were unusually strong during the recent weeks possibly due to weather conditions. The Aviation Colour Code remained at Yellow (second lowest on a 4 four-color scale) and the Volcanic Alert Level remained at 1 (on a scale of 0-5). [details]
jeudi, janv. 31, 2013
Weak earthquakes continue to occur under the volcano, but the general level of seismic activity has remained low. [details]
mercredi, janv. 30, 2013
Some small earthquakes have appeared again today, but generally, seismic activity has been showing a decreasing trend over the past weeks. [details]
mardi, janv. 22, 2013
Tongariro's current status remains characterized by strong degassing from the Te Maari craters, the site of eruptions in August and November 2012. At present, seismic activity is low. This activity is likely to go on several years, but Tongariro could produce new eruptions with little or no precursors, New Zealand's GNS writes in its recent update: ... [details]