Mauna Loa seismicity rates stayed approximately constant relative to last month in August 2025.

Only 90 small-magnitude earthquakes were detected beneath its summit. Earthquakes were <M1 with the exception of one M2+ event.

Data from 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 indicate these values are at background levels, with little change relative to previous months.

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

DLNR Photo