#AshventCalendar day 4

When #volcanic ash deposits on snow, even small #eruptions leave a distinctive trace. Frequent explosive eruptions & extensive snows make this common on Russia's #Kamchatka Peninsula.

@CopernicusEU #Sentinel2 image / Bezymianny volcano, Mar 16, 2019.

#AshventCalendar day 3

Eyjafjallajökull (#Iceland) erupting on Apr 14, 2010. The world's most famous (or infamous) ash plume? This eruption, among the #decade's most notable, helped define the volcano research agenda in the 2010s due to its impacts on aviation.

📷Marco Fulle

#AshventCalendar day 2

@NASA Total Ozone Mapping Spectrometer image of ash from #Galunggung #volcano, #Java on June 25, 1982. Several hours earlier, @British_Airways Flight 9 (LHR-AKL) flew into this cloud & lost all 4 engines, before recovering & landing safely in Jakarta.

Volcanic ash: fragmented magma; often highly abrasive; hazard to health and aviation; source of essential nutrients on Earth's surface; definitely not smoke.

#AshventCalendar

Images: Semeru #volcano, #Indonesia; Sept 15, 2017. Copyright 2017 @planetlabs.