Caroline Little

Volcanic Alert Bulletin WI-2013/17 - White Island Volcano

Published: Tue Aug 20 2013 2:00 PM
Volcanic Activity Bulletin
Volcanic Activity BulletinWI-2013/17
Tue Aug 20 2013 2:00 PM; Whakaari/White Island Volcano
Volcanic Alert Level remains at 2
Aviation Colour Code is lowered to Orange

A small eruption occurred at White Island at 10:23 on Tuesday 20 August 2013 (NZ local time) and continued for about 10 minutes.

The eruption column was visible from the Bay of Plenty coast with a plume rising to about 4 km above sea level before slowly dispersing. The activity at White Island has now returned to that before this morning's eruption.

The eruption originated in the active crater area that has been experiencing very small mud eruptions in recent weeks. The eruption threw mud and rocks a short distance from the source, and produced large volumes of white steam. Weather radar observations show that a small proportion of volcanic ash was carried with the steam.

White Island has been experiencing low level activity since August 2012 so an eruption like that this morning was not completely unexpected. Volcanologists observed a short period of strong volcanic tremor yesterday morning, but is is not clear if this was related to this morning's eruption.

The hazards posed by an eruption like that this morning are restricted to anyone on White Island or possibly anchored nearby in a boat. Anyone living in the Bay of Plenty is not at risk.

Duty Volcanologist Nico Fournier said “It is too soon for any kind of prediction of activity in the next few days. Given the low level of activity over the last year we are watching carefully and would not be surprised if there were further eruptions in the next few days”. A futher update will be issued on Wednesday morning unless there is a substantial change in activity before then.

Background The Volcanic Alert Level ranges from 0 to 5 and defines the current status at a volcano. Level 2 indicates minor eruptive activity.

Aviation Colour Codes are based on four colours and are intended for quick reference only in the international civil aviation community.

Nico Fournier Duty Volcanologist

__Contact: __Brad Scott