Increased activity observed at Shishaldin volcano, Alaska
Volcanologists at the Alaska Volcano Observatory (AVO) are reporting increased activity at Shishaldin volcano. As a result, the Aviation Color Code was raised to Orange.
The Weekly Volcanic Activity Report: July 5 – 11, 2023
New activity/unrest was reported for 12 volcanoes. During the same period, ongoing activity was reported for 11 volcanoes.
Mud volcano erupts Taiwan’s Pingtung County, inundating farmland
A mud volcano erupted in Taiwan’s Pingtung County on July 11, 2023, ejecting steam and mud from several vents up to 2 m (6.5 feet) in the air.
Intensity of the eruption in Iceland decreased, new fissures may open rapidly
Since its onset at 16:40 UTC on Monday, July 10, 2023, the eruption near Litli-Hrútur mountain on the Reykjanes Peninsula has seen a significant drop in intensity, with fewer and smaller lava fountains now compared to the initial stages.
Volcanic eruption starts just northwest of Litli Hrutur, Reykjanes Peninsula, Iceland
After 6 days of intense seismicity between Fagradalsfjall and Keilir, Reykjanes Peninsula, Iceland, a new volcanic eruption has started just northwest of Litli Hrutur at around 17:00 UTC on July 10, 2023.
GPS and InSAR records strongly suggest magma is migrating toward the surface between Fagradalsfjall and Keilir, Iceland
Since the onset of the seismic swarm in the Reykjanes Peninsula, on July 4, 2023, more than 8 500 earthquakes have been recorded in the area between Fagradalsfjall and Keilir. While seismic activity in this area is decreasing, deformation data strongly suggests that magma is rising toward the surface.
Unusually strong earthquake swarm at Eldey volcano, Aviation Color Code raised to Yellow, Iceland
Shortly before midnight on July 6, 2023, a seismic sequence commenced close to Eldey Island on Reykjanes Ridge, approximately 10 km (6.2 miles) southwest off of Reykjanes Peninsula, Iceland. As a result, the Aviation Color Code was raised to Yellow.
Destructive lahars descend down the slopes of Semeru volcano, Indonesia
10 days of continuous rainfall caused a large amount of volcanic material, debris and water to move down the slopes of the Semeru volcano on July 7, 2023, leading to destructive overflows and severe damage.
More than 4 700 earthquakes detected between Fagradalsfjall and Keilir in 48 hours, Iceland
More than 4 700 earthquakes have been detected in the area between Fagradalsfjall and Keilir, Reykjanes Peninsula, Iceland since the start of seismic swarm on July 4, 2023. Ground deformation (GPS) observations show significant movements, indicating magma propagation in the region where earthquakes are highly concentrated. Magma intrusion is close enough to the Earth’s surface that a volcanic eruption could occur without further escalations in seismic activity or ground deformation.
Strong explosion produces pyroclastic flows at San Cristobal volcano, Nicaragua
Nicaragua’s San Cristobal volcano erupted on July 5, 2023, producing pyroclastic flows and huge amounts of ash.