This photo was taken by a Hawaiian Volcano Observatory monitoring webcam just before 6 a.m. July 9, 2025, during Episode 28 ...

The last time Mauna Loa erupted was in 1984. Most of the U.S. volcanoes that scientists consider to be active are found in Hawaii, Alaska and the West Coast.

Volcano Update » Volcano Watch: Comparing crises — Mauna Loa 1984 vs. Mauna Loa 2022 Sunday, February 19, 2023 12:05 am By Hawaiian Volcano Observatory Special to West Hawaii Today Share this story ...

(Credit: HVO/Public Domain) The researchers found that the volcano’s erupting lavas contained a magnesium oxide content of 6.2 weight percent—lower than Mauna Loa lava’s typical concentration.

The Mauna Loa volcano erupted in November for the first time in nearly 40 years, forcing Southwest Airlines to issue a travel advisory. Overall, Mauna Loa has erupted 33 times since 1843 ...

We held community meetings, gave media interviews, published “Volcano Watch” articles, official notices, and social media posts about the uncertainties and certainties of a Mauna Loa eruption.