Senior Volcano Geophysicist at GNS, Steve Sherburn, told ONE News there could be more activity in the next few weeks.
"I think for the next week or two weeks at least we're possibly in a situation where we may get additional activity - it's really hard to work out. This is the difficulty of dealing with a volcano like Tongariro."
PETROPAVLOVSK-KAMCHATSKY, November 28 (RIA Novosti) - An explosive volcanic eruption began in Russia’s Far Eastern Kamchatka Peninsula on Tuesday, the Kamchatka Volcanic Eruption Response Team (KVERT) said on Wednesday.
JAKARTA, Nov. 28 (Xinhua) -- Mount Lokon volcano in North Sulawesi erupted on Wednesday, spewing ash up to 3.5 kilometers to the sky, without report of fatality and evacuation, officials said.
Head of National Volcanology Surono said that the eruption took place at 10:05 local time (0205 GMT).
On 12 December the GeoNet Data Centre posted a report describing a new lava dome at White Island that volcanologists recently noticed. The spiny lava dome was 20-30 m in diameter and grew in a crater formed during an eruption on 5 August. A prominent steam plume rose from the dome. Comments from tour operators at White Island suggested that the dome may have been visible two weeks earlier, but not as clearly as on 10 December. The Alert Level was raised to 2 (on a scale of 0-5), and the Aviation Colour Code was raised to Orange (second highest on a four-color scale).
When they set up three GPS stations to confirm this data, the results were startling: The ground is uplifting at a rate of almost 30 centimeters per year, and is now 1.4 meters higher than it was in 2007.
The scientists estimate that the horizontal reservoir of magma, called a sill, measures 7.5 by 5.5 km, and sits about 5 km underground. Not only is the sill growing, pushing up the earth above it, but its growth is also accelerating.
The authorities in Argentina and Chile have issued an alert over increased activity at the Copahue volcano, which has begun spewing smoke and gas.
Many residents have already left the area as a precaution. An orange volcano alert, the second highest, has been issued in both countries. The 3,000m (10,000ft) volcano is in Argentina's south-western Neuquen province, which borders the Biobio region of Chile.
According to SERNAGEOMIN, the eruption is most likely a small phreatic event. This is a abbreviated translation of the latest press release:
- From 10:45 local time, the seismic signal recorded at stations installed around the volcano Copahue showed a rapid increase and was characterized by strong low frequency tremor.
- The tremor signal correlated with an increase in the gas column, which turned black as ashes were erupted. The plume reached a height of 1.5 km and drifted about 13 km to the SW.
- Given the nature of the suddenly rising seismic signal with no detected precursory seismic activity, the low height of the eruption column, which implies a low temperature, and the presence of an extensive hydrothermal system at the volcano, the still continuing eruption is a minor phreatic eruption. It is expected to primarily affect areas near the crater and ash fall confined to proximal surrounding areas.
However, it is possible that the current activity evolves into a major event.
At 21:43 local time Saturday, a strong harmonic tremor signal occurred with the same dominant frequency 1.36 Hz and an intermediate intensity (2x stronger than the one during earlier records). Immediately after this episode that lasted about 5 minutes there were 2 explosions with loud noises heard.
The camera installed around the volcano, allowed to observe glow reflected in the clouds, and an area of it in the active crater. The raise in tremor and the explosions also correlated with an increase of the gas column.
The eruptions of Copahue during recorded history are mostly small to moderate in size. One likely scenario are frequent phreatic or phreatomagmatic (generated by interaction of magma and water) explosions. Under these conditions, the main danger is from the fallout of pyroclastic material (ash fall and ballistic impacts in proximal areas). Larger explosions could generate pyroclastic surges and lahars.
The authorities in Nicaragua have ordered the evacuation of about 400 people living near San Cristobal volcano after it began spewing out hot gases and ash on Tuesday.
The authorities also declared an amber alert covering 5 sq km around the volcano, warning of a possible risk.
Airlines were also told to avoid flying over western Nicaragua.
First Lady and government spokeswoman Rosario Murillo said 15 eruptions were recorded since Tuesday night.
The eruptions were small, but Ms Murillo said it was impossible to know for certain whether there would be larger ones that could put the population at risk.
The hot gases spewed by the San Cristobal volcano reached an altitude of 2,500 m.
Its ashes could reach 11 communities living in the vicinity.
The Nicaraguan army has sent rescue teams to the area.
San Cristobal, Nicaragua's highest volcano, is located about 135 km northwest of Managua.