Kilauea volcano (Hawai'i): lava lake grows at low-level fountaining
Sat, 2 Oct 2021, 04:4904:49 AM | BY: MARTIN
Lava fountains create waves in the lake surface (image: HVO)
Fountaining on the western crater wall at 18:00 local time yesterday (image: HVO)
The effusive eruption of the volcano continues and remains active within the Halemaʻumaʻu crater.
Several vents stretching from the lake's center to its southern margin (right) and fissure in the western wall (bottom right) (image: HVO)
Fountaining continues at two locations, from several vents stretching from the lake's center to its southern margin and from the western wall of the summit crater.
The discharge rate of lava fountains, which continue to feed the growing lava lake, seems rather low compared to the previous day. Less vigorous fountains reached heights of 15 meters yesterday. Lava fountains through the lava lake create waves or ripples in the lake surface. The ripples are visible on the surface as thin crustal plates move apart and back together again as the wave motion passes by (like inner tubes in a crowded wave pool), creating a moving arc of increased glow, reported the Hawaiian Volcano Observatory (HVO).
The lava lake surface has risen about 4 meters over the past 24 hours and has risen approx. 24 meters since the eruption started. Localized and discontinuous crustal foundering continues (a process by which cool lava crust on the surface of the lava lake is overridden by less-dense liquid from below causing the crust to sink into the underlying lake lava).
Sulfur dioxide (SO2) emissions reached to a 20,000 tonnes/day yesterday which is significantly lower than origin emissions rates (85,000 t/d) detected at the beginning of the eruption.
Volcanic-seismic tremor continues at stable levels associated with few quakes.
The HVO warning bulletin states: "High levels of volcanic gas are the primary hazard of concern, as this hazard can have far-reaching effects down-wind. Large amounts of volcanic gases — water vapor (H2O), carbon dioxide (CO2), and sulfur dioxide (SO2) are continuously released during the eruption. As SO2 is released from the summit, it reacts in the atmosphere to create the visible haze known as vog (volcanic smog). Vog creates the potential for airborne health hazards to residents and visitors, damages agricultural crops and other plants, and affects livestock."
Source: Hawaiian Volcano Observatory volcano activity update 2 October 2021
Fri, 1 Oct 2021, 01:19