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#Erupting

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Fluid #basalt #flows can extend tens of kilometers from an #erupting vent. The leading edges of basalt flows can #travel as #fast as 10 km/h (6 mph) on steep slopes but they typically advance less than 1 km/h (0.27 m/s or about 1 ft/s) on gentle slopes.
But when basalt lava flows are confined within a channel or lava tube on a steep slope, the main body of the flow can reach velocities >30 km/h (19 mph).
usgs.gov/programs/VHP/lava-flo

www.usgs.govLava flows destroy everything in their path | U.S. Geological SurveyLava flows typically move slowly enough to outrun them, but they will destroy everything in their path.