Results from the March 1999 deformation survey about Taupo Volcanic Centre are now to hand. These surveys are conducted three monthly. The results from the March 1999 survey show a continuation of the trends which have been apparent since 1997.

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

1. A 8 - 10mm 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).

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-1996. The latest results show the subsidence across the northern shores is continuing, but at a lower rate, while further uplift has occurred at Horomatangi Reef and other near by stations.

No significant earthquake activity has occurred within Taupo Volcanic Centre since December 1998.

Alert Status

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

Brad Scott
Volcano Surveillance Manager