High resolution 3D confocal microscope imaging of volcanic ash particles

Area of Science:

• Volcanology
• Geology
• Materials Science

Background:

• Volcanic ash particles, particularly those less than 100μm (including PM₁₀s), pose inhalation risks.
• Previous research predominantly employed 2D microscopy for volcanic particle analysis.
• Understanding ash particle morphology is crucial for assessing environmental and health impacts.

Purpose of the Study:

• To evaluate 3D laser scanning confocal microscopy as a robust method for analyzing volcanic ash.
• To determine the extent of high-resolution surface and volume data obtainable for ash classification.
• To characterize the 3D surface structure of ash from Eyjafjallajökull (2010) and Grimsvötn (2011) eruptions.

Main Methods:

• Utilized a high-resolution Olympus LEXT scanning confocal microscope.
• Employed ×50 and ×100 objective lenses for detailed imaging.
• Analyzed the 3D surface structure of volcanic ash particles.

Main Results:

• 3D confocal microscopy yielded highly encouraging results for ash particle analysis.
• Identified diverse particle types with sharp or concave edges, indicative of explosive magma rupture.
• Obtained initial surface area/volume ratios for the analyzed ash particles.

Conclusions:

• 3D laser scanning confocal microscopy is a promising tool for detailed volcanic ash characterization.
• The obtained high-resolution data can aid in classifying ash particles.
• Surface area/volume data may inform models of ash-related damage to aircraft engines and human health.