Science Innovations: Ultrasensitive Tactile Sensors for Robots  |  Policy Indications: How Materials Science Helps Contain Contain Covid-19 Spread  |  National Edu News: IIT Hyderabad and PharmCADD signed a pact for the co-development of new drugs   |  Teacher Insights: Be Game  |  Health Monitor: Understanding ‘Haemorrhage'  |  National Edu News: Pallikkutam GlobalConnect#3 on 'Innovative Tools for Effective Teaching'  |  Expert Counsel: The Nine Dash Line  |  National Edu News: Astronomers Find One Group of Appearing and Disappearing Stars  |  Teacher Insights: Bird Book for Children to Love Nature  |  International Edu News: New Model to Fight Social Media Deep Fakes  |  Teacher Insights: Universal Lunch Makes Students Healthier  |  Teacher Insights: Physical Activity Boosts Self Regulation  |  Parent Interventions: Anti-Inflammatory Foods Reduce Blood Fats  |  Parent Interventions: New Technique to Treat ADHD  |  Parent Interventions: Reduce Lab Tests in NICU Patients  |  
March 07, 2021 Sunday 05:05:05 PM IST

The Mystery of the Flying Volcanic Ash Particles Revealed

Science Innovations

When the Eyjafjallajokull volcano erupted in Iceland in April 2010, air traffic was interrupted for six days and then disrupted until May. Interestingly, particles of the volcano were discovered in UK which were much larger than expected. According to Eduardo Rossi, a researcher at the Department of Earth Sciences of University of Geneva (UNIGE) said that fragments thrown out during a volcanic explosion range from a few microns to more than two metres.  The larger particles are faster and closer to the volcano.

The scientists analysed the volcanic ash particles from Sakurajima volcano of Japan that erupts 2-3 times daily for more than 50 years. The scientists used adhesive paper to collect the ash before it hit the ground. IN Ehyjafjallajokull eruption, micrometric particles group  into clusters. On hitting the ground it gets destroyed. 

In Japan, the scientists used high speed camera to observe the sedimentation of the ash in real-time and saw the clusters. It is formed by large particle of 100-800 microns-the core-which is covered by many small particles less than 60 microns. This external layer of small particles can act like a parachute over the core, delaying its sedimentation. This is called the rafting effect. Scientists were thus able to solve the mystery of how large particles of volcanic ash particles of Eyjafjallajokull was discovered in UK which was attributed to the rafting effect.