In the shadow of Auckland's majestic volcanoes, a hidden danger lurks, one that could potentially impact the health and safety of its 1.8 million residents. The recent study on volcanic gas emissions has shed light on the 'very corrosive' nature of these gases, revealing a critical aspect of emergency planning that was previously overlooked. This article delves into the findings, explores their implications, and offers a fresh perspective on the volcanic risks facing Auckland.
Unveiling the Toxic Cloud
The study, funded by the Natural Hazards Commission and Auckland Council, has filled a critical gap in our understanding of volcanic gas emissions. By analyzing ash and rock from past eruptions, researchers have estimated that Auckland's volcanoes have released approximately 26,000 kilotonnes of carbon dioxide and 9,000 kilotonnes of sulphur dioxide over the past 200,000 years. This is a staggering amount, equivalent to filling 3.5 million hot air balloons with gas from the largest eruption, which formed Rangitoto Island.
What makes this discovery particularly fascinating is the potential health risks associated with volcanic gas. As Jo Horrocks, the Natural Hazards Commission's chief resilience officer, points out, these gases can be 'very, very corrosive'. This is especially concerning for individuals with respiratory illnesses like asthma, as gas concentrations during an eruption would be significantly higher than in places like Rotorua. Moreover, the corrosive nature of the gases could also damage buildings and infrastructure, adding another layer of complexity to emergency planning.
The Uncertainty of Eruption Timing
One of the key uncertainties highlighted by the study is the duration of an eruption. As Elaine Smid, the lead author, explains, the same amount of gas erupted over four days would pose a different hazard than the same amount erupted over 300 days. This raises a deeper question: how can we effectively prepare for an eruption if we don't know when it will happen or how long it will last? The fact that Auckland's volcanic system is characterized by unpredictable eruption locations further complicates matters.
From my perspective, this uncertainty is what makes the study so crucial. It underscores the need for continuous research and monitoring to better understand the volcanic risks facing the city. As Smid notes, 'We’ve got 1.8 million people living on top of a potentially active volcanic field. That’s why it’s so important to study.'
The Broader Implications
The study's findings have broader implications for emergency planning and risk management. By quantifying the potential gas emissions, it provides a scientific basis for developing more effective strategies to mitigate the risks. This is particularly important in a densely populated city like Auckland, where the impact of an eruption could be devastating.
One thing that immediately stands out is the need for public awareness and education. Many people may not realize the potential dangers of volcanic gas, and this study highlights the importance of communicating these risks to the public. It also raises the question of whether existing emergency plans are adequately prepared to handle a volcanic eruption, and whether more needs to be done to ensure the safety of residents.
Looking Ahead
As Auckland Council continues to support research in this area, it is crucial to consider the long-term implications of these findings. The study has provided a foundation for further research, and it is essential to build upon this knowledge to better understand the volcanic risks facing the city. This includes exploring the potential for early warning systems, which could provide valuable time for evacuation and preparation.
In conclusion, the study on volcanic gas emissions in Auckland has revealed a hidden danger that could have significant implications for the city's residents. By understanding the potential risks and uncertainties, we can work towards developing more effective emergency plans and ensuring the safety of those living in the shadow of these majestic volcanoes. As Smid says, 'Gas is a significant but under-recognised hazard in Auckland.' It's time we recognize and address this hazard head-on.
