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Magnetic Anomaly under Lake Rotorua
February 10 , 2024
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- Scientists have unveiled a hidden hydrothermal system beneath the waters of Lake Rotorua.
- This site steeped in Maori legend and situated atop a dormant volcanic crater on New Zealand's North Island.
- Lake Rotorua was formed around 200,000 years ago by a volcanic eruption, and it is still home to hydrothermal activity today.
- The lake itself is shallow, with an average depth of about 10 meters, and is part of the Taupo Volcanic Zone.
- Volcanic rocks exhibit strong positive magnetic responses due to the presence of magnetite.
- However, the anomaly detected suggests that hydrothermal fluids have altered the magnetite into pyrite.
- It is resulting in a significantly reduced magnetic signal.
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