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Taupo volcano (North Island, New Zealand) - Smithsonian / USGS Weekly Volcanic Activity Report for 14 September-20 September 2022 (New Activity / Unrest)

Wed, 21 Sep 2022, 14:00
14:00 PM | BY: VN
On 20 September GeoNet raised the Volcanic Alert Level for Taupo to 1 (the second lowest level on a six-level scale) reflecting “minor volcanic unrest” characterized by ongoing seismicity and inflation. Seismicity beneath Lake Taupo began increasing in May. Earthquakes occurred at a rate of about 30 per week but increased to about 40 per week in early September.
A M 4.2 earthquake, the largest so far this year, was recorded on 10 September and felt by over 1,000 people. By 20 September over 700 earthquakes had been located with depths less than 30 km, though most ranged 4-13 km. The earthquake locations were in two clusters: a larger cluster beneath the central and E part of the lake, and a smaller cluster to the W centered just offshore from Karangahape.
An area of deformation at Horomatangi Reef had been rising at a rate of 60 mm (plus or minus 20 mm) per year since May. The area of uplift corresponded to the main seismic swarm. The data suggested that the seismicity and deformation was caused by the movement of magma and hydrothermal fluids.

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GeoNet noted that unrest at calderas was common and may continue for months or years without resulting in an eruption; more significant unrest would be indicated by additional indicators of activity and substantial impacts on the local area. There have been 17 previous episodes of unrest at Taupo over the previous 150 years, some more notable than the current episode, and many others before written records. None resulted in an eruption, with the last eruption occurring around 232 CE.
The Volcanic Alert Level change was informed by ongoing analysis of monitoring data, research, and deepening knowledge of past unrest.

Source: GeoNet
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From: Global Volcanism Program, 2022. Report on Taupo. In: Mayberry, G (ed.), Weekly Volcanic Activity Report 14 September-20 September 2022. Smithsonian Institution and US Geological Survey.

Previous news

Thu, 15 Sep 2022, 10:00

Taupo volcano (North Island, New Zealand) - Smithsonian / USGS Weekly Volcanic Activity Report for 14 September-20 September 2022 (New Activity / Unrest)

On 20 September GeoNet raised the Volcanic Alert Level for Taupo to 1 (the second lowest level on a six-level scale) reflecting “minor volcanic unrest” characterized by ongoing seismicity and inflation. Seismicity beneath Lake Taupo began increasing in May. Earthquakes occurred at a rate of about 30 per week but increased to about 40 per week in early September. ... Read all
Wed, 14 Sep 2022, 03:58

Taupo volcano (New Zealand): number of earthquakes has increased, M 4.2 quake felt locally

Two main earthquake clusters dominate beneath the Taupō lake now (image: GeoNet New Zealand)
The elevated seismic activity continues. ... Read all
Show more
Taupo volcano
Caldera 760 m / 2,493 ft
New Zealand, -38.82°S / 176°E
Current status: restless (2 out of 5) Taupo volcano eruptions:
260 AD (?) 
Typical eruption style
unspecified
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