Volcano Watch: Mauna Loa reawakens

  • USGS photo This image, taken during an early morning overflight on Nov. 30, shows Fissure 3, the dominant source of lava activity.

At 10:45 p.m. Sunday evening, Nov. 27, USGS Hawaiian Volcano Observatory scientists were alerted to an earthquake swarm beneath Mauna Loa. Before an hour had gone by, lava had broken the surface within Moku‘aweoweo, the summit caldera, for the first time in 38 years.