1064 PHLEGRAEAN FIELDS UNDER PRESSURE: pink Lake Avernus and extreme temperatures

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1064 PHLEGRAEAN FIELDS UNDER PRESSURE: pink Lake Avernus and extreme temperatures  

1 Mar 2026 The Phlegraean Fields, a complex volcanic system, are showing signs of pressure and temperature changes. While the pink hue of Lake Avernus is a chemical-biological phenomenon, the overall system remains dynamic with ongoing deformation, gas emissions, and high temperatures. Daily monitoring and data collection are crucial for understanding and responding to these changes. 

https://youtu.be/3kRGB10T47E?si=uzVQn55q5rQQmmVT

  • Lake Avernus Observation: Drones observed Lake Avernus tinged with pink. 
  • Pisciarelli Fumarole Activity: Less visible degassing but increased pressure and forceful hydrothermal mud expulsion, reminiscent of the activity preceding a significant tremor in March 2025. 
  • Pisciarelli Temperature Trend: Stable at 105.8°C, but monthly and annual trends show persistence, indicating ongoing energy supply in the hydrothermal system. 
  • Solfatara Crater Pressure and Temperature: High internal pressure from gas push, with a constant high temperature of 184.9°C at the Boccagrande fumarole. 
  • Lake Avernus Pink Hue: Caused by a chemical-biological phenomenon due to changes in water composition, likely from the proliferation of halophilic microorganisms or precipitation of iron-rich minerals. 
  • Volcanic Activity Indicators: The pink lake colour, while not directly caused by bradyseism, indicates a dynamic system due to changing environmental parameters. 
  • Campi Flegrei Caldera Monitoring: Ongoing deformation, gas emissions, high temperatures, mud expulsion, and drying pools suggest the caldera remains active. 
  • Importance of Transparency and Monitoring: Continuous observation, data collection, and transparent communication are crucial for understanding and responding to the caldera’s activity.

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