[4] In mid-September, the United States Geological Survey (USGS) recorded an increase in earthquakes beneath Moku‘āweoweo and to its northwest.

[10] After 36 minor earthquakes were detected near Mauna Loa on October 28–29, the Hawaii County Civil Defense Agency (HCCDA) issued a volcano advisory that warned of a "state of heightened unrest" but noted that there were still no signs of an imminent eruption.

[14] The eruption remained confined to the caldera until approximately 6:30 a.m. on November 28, when it migrated from the summit to the Northeast Rift Zone with fissures feeding new lava flows.

[24] A December 12 update stated, "The Northeast Rift Zone eruption of Mauna Loa may still be active at the Fissure 3 vent but all 2022 lava flows appear to be inactive" and "Tremor (a signal associated with subsurface fluid movement) is no longer detectable".

Scientists said that the link between the simultaneous decreases in activity at the neighboring volcanos was "surprising and thought-provoking" but unclear, and might be a coincidence, though previous correlations in their behavior had been observed.

[31] The National Weather Service (NWS) issued an ashfall advisory through 22:00 HST on November 28, warning that up to a quarter-inch of ash could accumulate in some parts of the island.

[35] On the evening of November 28, a lava flow from the third fissure crossed the road leading to the Mauna Loa Observatory, disrupting power and access to the facility.

[36] This disruption has halted observations taken by carbon dioxide (CO2) measurement equipment that produces the famous Keeling Curve, a graph of CO2 accumulation in the atmosphere often used to show the role of human greenhouse gas emissions in climate change.

[3] Dr. Ralph Keeling, the scientist in charge of the program, said in early December that it would likely be at least several months before the equipment is restarted, and NOAA considered flying in a generator by helicopter in the meantime.

[42] As lava approached the highway on December 5, Governor Ige activated 20 members of the Hawai'i National Guard to assist with traffic control, among other eruption-related duties.

After the eruption, the Hawaii Emergency Management Agency (HI-EMA) estimated the cost of damage to private infrastructure at $1.5 million.

[27] In the first week of 2023, a joint team from HI-EMA and the Federal Emergency Management Agency (FEMA) came to the island to assess damage to infrastructure.

[47] During the first days of the eruption, thousands of spectators clogged Saddle Road before the government moved to restrict access for emergency responders as needed.