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USGS MAUNA LOA MORNING UPDATE FOR DAY 8

8:06 PM · Dec 5, 2022

USGS - The Northeast Rift Zone eruption of Mauna Loa continues. One active fissure, fissure 3, is feeding a lava flow advancing slowly northward toward the Daniel K. Inouye Highway (Saddle Road). The lava flow has reached relatively flat ground causing it to slow down significantly over the past several days, as expected. As of 6:30 a.m. today, December 5, the flow front was about 2.16 mi (3.5 km) from the Daniel K. Inouye Highway (Saddle Road). There continued to be several small overflows from main channels recorded over the past day. During the past 24 hours, the lava flow advanced at an average rate of about 25 feet per hour (8 meters per hour). Though the advance rate has slowed over the past several days, the lava flow remains active with a continuous supply from the fissure 3 vent. Advance rates may be highly variable over the coming days and weeks. On the flat ground between Mauna Loa and Mauna Kea, lava flows advance more slowly, spread out, and inflate. Individual lobes may advance quickly, and then stall. Additional breakouts may occur if lava channels get blocked upslope. There are many variables at play and both the direction and timing of flow advances are expected to change over periods of hours to days, making it difficult to estimate when or if the flow will impact Daniel K. Inouye Highway. Sulfur dioxide (SO2) emission rates of approximately 180,000 tonnes per day (t/d) were measured on December 1, 2022, and remain elevated. Volcanic gas plumes are lofting high and vertically into the atmosphere before being blown to the west at high altitude, generating vog in areas downwind. Vog information can be found at https://vog.ivhhn.org/. Pele's hair (strands of volcanic glass) fragments are being wafted great distances and have been reported as far Laupāhoehoe. Tremor (a signal associated with subsurface fluid movement) continues beneath the currently active fissures. This indicates that magma is still being supplied to the fissure, and activity is likely to continue as long as we see this signal. There is no active lava within Moku'āweoweo caldera nor the Southwest Rift Zone. We do not expect any eruptive activity outside the Northeast Rift Zone. ---- End of USGS update ---- Image: A view of the northern side of fissure 3 taken during an early morning overflight. Fissure 3 is located on Mauna Loa's Northeast Rift Zone and is feeding a lava flow that is 10.34 miles (16.70 km) long. The spatter erupted has built the cone to a height of 95 feet (29 meters). USGS image by L. Gallant.

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