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November 28, 2022 — Mauna Loa eruption map

November 28, 2022
Color map of eruption
An eruption of Mauna Loa volcano started at 11:30 p.m. on Sunday, November 27, 2022. Initial fissures covered the floor of Moku‘āweoweo caldera with new lava, but this area was mostly inactive by the time HVO field crews arrived after sunrise on Monday morning. Other fissures spilled lava to the southwest of the summit region, but this area was also inactive by that time. HVO field crews observed active lava flowing to the north of the upper Northeast Rift Zone, in the direction of the access road to the NOAA Mauna Loa Observatory, but not reaching it. New fissures opened in a northeasterly direction along the rift throughout the day. By the time HVO field crews left the area (due to adverse weather) at 1:30 p.m., most of the eruptive activity was focused at a single fissure marked here in dark purple. This fissure was sending lava flows in multiple directions, but the most vigorous and farthest travelled was a set of three lobes moving to the northeast, marked here by red dots. Cloudy weather hampered mapping efforts on Monday; more complete lava flow maps are expected in the coming days. HVO continues to monitor the eruptive activity via its existing monitoring network, along with new webcams deployed on Monday.