Latest news & updates from White Island
White Island volcano (New Zealand): unusual seismic activity
Wednesday Jul 10, 2013 17:00 PM | DOOR: T
Current seismic recording from White Island (GeoNet)
GeoNet issued a new bulletin about unusual seismic activity at White Island, but mentions that there is no current eruption:
Webcam image of White Island (crater rim webcam, GeoNet)
"Over the past few weeks White Island has repeatedly produced very small volcanic earthquakes. These small tremor bursts are occurring like clockwork, approximately every 70 seconds, creating a unique pattern on our earthquake drum, with hundreds of these small bursts recorded every day.
The earthquakes may be created by fluid moving through a pipe or crack, similar to a simmering cooking pot as steam escapes from the lid. Pressure in the pot builds up until it exceeds the weight of the lid; it then rattles (the earthquake) as steam is released from under the lid. In this case, there is no indication of associated gas release at the surface, indicating that this process is occurring at depth.
There is a hot lake and lava dome (recently erupted rock) at White Island. We haven't seen any activity during visits at these surface features that can be related to the volcanic earthquakes, so the moving fluids that are causing the earthquakes must be below the surface. The pattern of the volcanic earthquakes has been changing over time, the tremor bursts change in size and frequency and they sometimes merge into a continuous signal called volcanic tremor."
On current webcam images, an incandescent area is visible, likely from burning sulfur (or a very hot gasses escaping) at fumarole near the crater lake.
Koppelingen / Bronnen:
Koppelingen / Bronnen:
- Small tremor at White Island like clockwork (GeoNet)
Monday, Apr 29, 2013
Geonet has lowered the alert level of the volcano back to green (normal), following a gradual decline in seismic activity over the past weeks. Degassing remains intense, and after heavy rainfall during the recent past, a lake has been re-established at the main crater. [meer...]
Saturday, Apr 20, 2013
Volcanic tremor remains unstable and has risen again a bit recently. [meer...]
Monday, Apr 15, 2013
Tremor remains unstable. After a period of low intensity, strong tremor has reappeared today, reflecting internal fluid movements and degassing. [meer...]
Wednesday, Apr 10, 2013
The strong volcanic tremor observed during the past days has dropped yesterday, but seems to be rising again today. GNS scientists reported that changes in water chemistry seen in recent samples from the White Island crater pool suggest that deep heat input into the volcano's plumbing system has diminished or ended. If this is right and the trend continues, White Island should return to a more stable state in the near future. [meer...]
Thursday, Mar 28, 2013
Volcanic tremor is continuous and at high levels. Strong steaming can be seen on the webcam. ... [meer...]