Science Alert Bulletin TPO-1999/01 - Taupo Volcanic Centre

Published: Mon Jan 18 1999 3:30 PM

Volcanic Alert BulletinTPO-1999/01
Taupo Volcano
Volcanic Alert Level remains at 0

18 January 1999, 2:30 pm - Update

Results from the December 1998 deformation survey about Taupo Volcanic Centre are now to hand. These surveys are conducted three monthly. The results from the December 1998 survey show generally insignificant changes since the September survey.

Two long-term trends have been apparent in the Taupo deformation data:

  1. A 8 - 10 mm per year subsidence along the northern shores, with the maximum subsidence at Kinloch; and
  2. Uplift about the lake centre, including Horomatangi Reef, Scenic Bay, Rotongaio and Motutaiko Island (Fig. 1).

Figure 1: Time series plots showing height changes (m) at selected sites.

Figure 1: Time series plots showing height changes (m) at selected sites.

The subsidence along the northern shores, represented by data from Kinloch, has been observed since the early 1980’s, while the uplift about the lake centre has been observed since mid-1995. The latest results show the subsidence across the northern shores is continuing to slow, while no further uplift has occurred at Horomatangi Reef.

In the September to December 1998 period three earthquakes were reported as felt in the Taupo area. This level of earthquake activity is considered normal for the Taupo area.

Alert Status

The Volcanic Alert Level for Taupo volcano remains at Level 0.

Brad Scott
Volcano Surveillance Manager