White Island (New Zealand): hot lake dries out, tuff cone forming at vent
Wednesday Jan 30, 2013 10:40 AM | BY: T
"The active vent continues to produce vigorous bursts of mud, rock, steam and gas from 50-100 m high. Ash is not being carried into the plume. This activity is intermittent as is the seismic activity. Current activity is not sufficient for Volcanic Alert Level 2.
"Larger explosions of mud, rock and perhaps molten sulphur are always possible and occur with little or no warning. A greater than usual hazard does exist for visitors to the island as a result of the current level of volcanic activity.
"GNS Science’s past monitoring of the island shows that new eruptive episodes often develop out of this type of activity. Small muddy lakes sometimes form in craters, as the unrest develops geysering and explosions occur through these lakes, becoming more vigorous with time.
"This morning the gas and steam plumes appear to have declined, judging from the various web camera images available. A gas flight is being conducted to day to ascertain if the volcanic gas flux has changed since Friday.
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Tuesday, Jan 29, 2013
Seismic activity has changed from continuous volcanic tremor to a pattern of intermittent tremor. When occurring, the volcanic tremor remains strong. GNS does not think that an eruption is imminent, but reports that the vigorous hydrothermal activity is throwing out rocks and mud and might be followed by ash emissions: ... [more]
Monday, Jan 28, 2013
Earthquakes continue to occur in pulses, and tremor remains elevated, but less stable. It just seems to have dropped sharply. ... [more]
Friday, Jan 25, 2013
New Zealand scientist undertook a gas measurements flight and found values of CO2 and SO2 emissions at similar levels as in December. Observations during the flight revealed that the mud geysering in the main crater lake is still vigorous ... [more]
Thursday, Jan 24, 2013
GeoNet has raised the alert to orange. Over the last 20-30 hours the style of seismic activity has changed. Although the level of volcanic tremor has started to decrease, hybrid volcanic earthquakes have appeared. Hybrid earthquakes are typically associated with the movement of molten material (magma) within an active volcano. [more]
Wednesday, Jan 23, 2013
Tremor and hydrothermal activity at the surface remain high. ... [more]