Project aims to boost understanding of the magma body that underlies Rotomahana.
For years, scientists have known there are two active geothermal systems under the 800ha lake, considered the warmest of the Rotorua lakes with year-long temperatures of 11C to 14C.
One of the systems is believed to be related to the 1886 Mt Tarawera eruption that destroyed the famed terraces.
The surrounding Okataina Caldera gives rise to a substantial amount of geothermal activity east of Rotorua, and was the source of the eruption.
To gain a detailed picture of these separate systems, scientists are dropping heat-measuring devices at more than 100 different points across the lakebed.
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