Publications by authors named "J L Eychenne"
Article Synopsis
- Explosive volcanic eruptions release large amounts of silicate ash, which undergoes surface changes while traveling through the atmosphere, affecting its interactions with the environment, including ice formation and toxicity to organisms.
- Previous studies have not accurately characterized the original ash surface due to the assumption that the surfaces formed during fragmentation mirror the bulk composition of the ash particles.
- Our research on andesite ash particles reveals significant differences in surface chemistry caused by the way fractures form in the magma, emphasizing the importance of these pre-eruptive features in influencing how ash behaves and interacts in various environmental contexts.
Article Synopsis
- The Tungurahua volcano in Ecuador emitted ash between 1999 and 2016, significantly affecting local rural areas, but its health impacts are not well documented.
- Researchers focused on the intense eruptive phase of August 16-17, 2006, mapping ash size distributions and analyzing a specific ash sample for its respiratory health effects.
- Their findings indicate high amounts of inhalable ash, with complex characteristics, resulting in minimal cell damage but some cell changes and a weak pro-inflammatory response in lung cells.
Volcanic ash exposure can lead to significant health risks. Damage to the respiratory and pulmonary systems are the most evident toxic side effects although the causes of these symptoms remain unclear. Conversely, the effects on other organs remain largely under-explored, limiting our understanding of the long-term volcanic ash-related risk at the whole-body scale.
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View Article and Find Full Text PDFVolcanic ash clouds are common, often unpredictable, phenomena generated during explosive eruptions. Mainly composed of very fine ash particles, they can be transported in the atmosphere at great distances from the source, having detrimental socio-economic impacts. However, proximal settling processes controlling the proportion (ε) of the very fine ash fraction distally transported in the atmosphere are still poorly understood.
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