Mauna Loa Update

MAUNA LOA (VNUM #332020)
19°28’30” N 155°36’29” W, Summit Elevation 13681 ft (4170 m)
Current Volcano Alert Level: NORMAL
Current Aviation Color Code: GREEN

Mauna Loa seismicity rates recovered from the previous month with an increase by 34%. Clustering under the upper-SWRZ dissipated, but dispersed small deeper (>13 km) events increase. The volcano remains relatively quiet nonetheless, with 70 small-magnitude earthquakes (below M3.0) detected beneath its summit, which is expected for this volcano following its eruption in 2022.

Data from Global Positioning System (GPS) instruments on Mauna Loa have continued to show only minor inflation beneath the summit as the volcano recovers from the 2022 eruption and magma replenishes the reservoir system.

Gas and temperature data from a station on Mauna Loa’s Southwest Rift Zone show that average hydrogen sulfide (H₂S) concentrations are below about 5 ppm, sulfur dioxide (SO₂) concentrations remain below the detection limit, and average fumarole temperatures remain below 84°C. All of these values represent background conditions for the volcano, little changed from previous months.

HVO continues to closely monitor Mauna Loa and will issue another update in one month, or earlier, should conditions change significantly.