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| Slow-moving front of an advancing `a`a lava flow. The leading edges of `a`a flows are characterized by steep, rubbly incandescent slopes; during this eruption, the flow fronts were as tall as 10 to 15 m. After repeated blockages and overflows of the main lava channel between April 5 and 8, the steady supply of lava to well-developed flow fronts below the 1,850-m level ceased. As the lowest flow fronts stagnated and the rate of eruption from the vents slowed, hazard concerns for Hilo diminished. |
