Mauna Loa Volcano Eruption Update

HAWAIIAN VOLCANO OBSERVATORY WEEKLY UPDATE
Thursday, January 6, 2022, 8:52 AM HST

 
An aerial view of the prominent 1940 cinder-and-spatter cone on the floor of Mauna Loa's summit caldera.
An aerial view of the prominent 1940 cinder-and-spatter cone on the floor of Mauna Loa's summit caldera. The cone, about 100 m (330 ft) high, was built during a 134-day-long eruption that began on April 7, 1940. Most of the caldera floor around the cone is covered by last lava flows erupted in 1984.

Photo courtesy of USGS

MAUNA LOA

Current Volcano Alert Level: ADVISORY
Current Aviation Color Code: YELLOW

Activity Summary: Mauna Loa volcano is not erupting. Rates of seismicity remain slightly elevated above long-term background levels, but have not changed significantly over the past week. Other Mauna Loa monitoring data streams—ground deformation, gas concentrations, visual appearance in webcams—show no significant changes.

Observations:
During the past week, HVO seismometers recorded approximately 45 small-magnitude (below M2.5) earthquakes below the summit and upper-elevation flanks of Mauna Loa. The majority of these earthquakes occurred at shallow depths less than 10 kilometers (6 miles) below sea level.

Global Positioning System (GPS) measurements show very low rates of deformation in the summit region continuing through the past week.

Gas concentrations and fumarole temperatures at the summit and Sulphur Cone on the Southwest Rift Zone remain stable.

Webcam views have shown no changes to the volcanic landscape on Mauna Loa over the past week.

Last updated: January 7, 2022

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