One of Stromboli's active vents, a steep symmetrical cone in the NW crater area, produced a number of "smoke rings" on 20 Jan 2019. These ring vortexes form when pulsating gas / steam emissions pass through a perfectly circular vent, generating this rare phenomenon.
Stromboli has been in an elevated state of activity since early January 2019, and there is plenty of evidence that magma is standing high inside its conduits.
Stromboli volcano news: [ Ссылка ]
Activity update / field report for 20 Jan 2019 when this video was taken: [ Ссылка ]

Video copyright: Tom Pfeiffer / www.volcanodiscovery.com

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