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Alert Level: NORMAL, Color Code: GREEN 2025-09-04 19:22:47 UTC HAWAIIAN VOLCANO OBSERVATORY MONTHLY 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 stayed approximately constant relative to last month. Only 90 small-magnitude earthquakes were detected beneath its summit. Earthquakes were <M1 with the exception of one M2+ event. 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 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. Background: Mauna Loa is the largest active volcano on our planet and covers half of the Island of Hawaiʻi. Eruptions tend to produce voluminous, fast-moving lava flows that can impact communities on the east and west sides of the island. Mauna Loa eruptions typically start at the summit and, within minutes to months of eruption onset, can migrate into either the Northeast or Southwest Rift Zone, or radial vents on the northwest flank. Since its first well-documented eruption in 1843, the volcano has erupted 34 times with intervals between eruptions ranging from months to decades. Mauna Loa erupted most recently in 2022. More Information: This notice contains volcanoes not displayed here: Hualalai (NORMAL/GREEN), Haleakala (NORMAL/GREEN), Mauna Kea (NORMAL/GREEN), Kama'ehuakanaloa (UNASSIGNED/UNASSIGNED). The Hawaiian Volcano Observatory is one of five volcano observatories within the U.S. Geological Survey and is responsible for monitoring volcanoes and earthquakes in Hawaiʻi and American Samoa. CONTACT INFORMATION: askHVO@usgs.gov Subscribe to these messages: https://volcanoes.usgs.gov/vns2/ |