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Volcano Updates

The Hawaiian Volcano Observatory issues updates and other types of Mauna Loa notifications as activity warrants.

Alert Level: NORMAL, Color Code: GREEN 2023-03-16 19:32:57 UTC
HVO/USGS Volcanic Activity Notice

Volcano: Mauna Loa (VNUM #332020)

Current Volcano Alert Level: NORMAL
Previous Volcano Alert Level: ADVISORY

Current Aviation Color Code: GREEN
Previous Aviation Color Code: YELLOW

Issued: Thursday, March 16, 2023, 9:32 AM HST
Source: Hawaiian Volcano Observatory
Notice Number: 2023/H109
Location: N 19 deg 28 min W 155 deg 36 min
Elevation: 13681 ft (4170 m)
Area: Hawaii

Volcanic Activity Summary:

Mauna Loa has been quiet for the past three months since the eruption ended on December 13, 2022.   The number of earthquakes beneath Mauna Loa's summit has returned to background levels.  Inflation of Mauna Loa continues as magma replenishes the summit magma chamber.

Accordingly, the USGS Hawaiian Volcano Observatory (HVO) is lowering the Volcano Alert Level for ground-based hazards from ADVISORY to NORMAL and the Aviation Color Code from YELLOW to GREEN. 

In conjunction with this change, Mauna Loa updates will change from weekly to monthly, with the next monthly update on April 6, 2023.

For more information about the meaning of aviation color codes, see 

Recent Observations:
[Volcanic cloud height] None
[Other volcanic cloud information] None
[Ballistics] N/A
[Lava flow/dome] N/A
[Lava flow] N/A

Hazard Analysis:
[General hazards] Mauna Loa Hazards: and
[Ash cloud] N/A
[Ashfall] N/A
[Lava flow/dome] N/A
[Mud flow] N/A
[Volcanic gas] N/A
[Other hazards] N/A
[Lava flow] N/A


HVO continues to closely monitor Mauna Loa for signs of renewed activity. Should volcanic activity change significantly a new Volcanic Activity Notice will be issued immediately. 
Residents and visitors should stay informed and follow County of Hawai‘i and Hawaiʻi Volcanoes National Park guidelines. 


    Next Notice:

    Mauna Loa monthly updates issued monthly on Thursdays beginning April 6, 2023. Should volcanic activity change significantly a new VAN will be issued. Regularly scheduled updates on the status of Mauna Loa will be posted on the HVO website at  

    More Information:

    Subscribe to these messages:
    Summary of volcanic hazards from eruptions:
    Recent earthquakes in Hawaiʻi (map and list):
    Explanation of Volcano Alert Levels and Aviation Color Codes: