[3] In April 2005, a large hydrothermal explosion occurred near a cow paddock within the Taupō-Reporoa Basin, destroying some trees, temporarily blocking a nearby stream and creating a 50-metre crater at 38°32′02″S 176°10′19″E / 38.533832°S 176.172010°E / -38.533832; 176.172010.

[1]: 189  The Waikato River where it leaves Lake Taupō enters the south east corner of the basin and is flanked by geothermal areas developed for power near Wairakei.

The Waikato River loops to the north before exiting the basin at its south-west but is always south of the caldera.

[8]: 109  This larger breach released about 20 km3 (4.8 cu mi) of water,[9]: 327  temporarily flooded some of the area of the former Lake Reporoa.

[1]: 197  This age is more consistent with argon–argon dating on the tephra, ignimbrite and samples from the later smaller rhyolite dome eruptions that happened after caldera formation.

[1]: 197, 203  Gravitational[11]: 1–6  and magnetic[12] studies have been used to define the caldera to being north of the present Waikato River course in the Taupō-Reporoa Basin.[13]: Fig.