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Latest update from the USGS-HVO on the Mauna Loa eruption

3:26 AM · Nov 30, 2022

USGS - The Northeast Rift Zone eruption of Mauna Loa continues, with several fissures and lava flows active. Several lava flows are traveling in a northeast direction. The longest and largest lava flow is issuing from fissure 3. This lava flow crossed the Mauna Loa Weather Observatory Road at approximately 8 p.m. yesterday evening, November 29, and the flow front was located approximately 4.5 miles (7.5 km) from Saddle Road at approximately 3:30 p.m. HST this afternoon (straight line distance). This afternoon, fountains at fissure 3 were consistently 40-50 m (131-164 ft) tall and fountains at fissure 4, which formed at approximately 7:30 p.m. HST on November 28, were 5-10 m (16-33 ft) tall. There is no active lava within Moku'āweoweo caldera, and there is no lava erupting from the Southwest Rift Zone. We do not expect any eruptive activity outside the Northeast Rift Zone. No property is at risk currently. There is a visible gas plume from the erupting fissure fountains and lava flows, with the plume primarily being blown to the North. Sulfur dioxide (SO2) emission rates of approximately 250,000 tonnes per day (t/d) were measured on November 28, 2022.

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