USGS Volcano Hazards Program Volcano Update


AVO update page and observatory web site


On Saturday, November 10, a small explosion at Cleveland was detected by infrasound instruments on neighboring islands, and produced an ash cloud that was visible in satellite imagery. Clouds have mostly prevented views of the volcano since then but no further activity has been detected.

Further sudden explosions of blocks and ash remain possible with little or no warning. Ash clouds, if produced, could exceed 20,000 feet above sea level. If a large ash-producing event occurs, nearby seismic, infrasound, or volcanic lightning networks should alert AVO staff quickly. However, for some events, a delay of several hours is possible. There is no real-time seismic monitoring network on Mount Cleveland and AVO is unable to track activity in real time. Cleveland volcano forms the western half of Chuginadak Island, a remote and uninhabited island in the east central Aleutians. It is located about 75 km (45 mi.) west of the community of Nikolski, and 1500 km (940 mi.) southwest of Anchorage. The volcano's most recent significant eruption began in February, 2001 and it produced 3 explosive events that produced ash clouds as high as 12 km (39,000 ft) above sea level. The 2001 eruption also produced a rubbly lava flow and hot avalanche that reached the sea. The current eruptive episode began in July 2011 and has included the growth of several small lava domes at the volcano's summit as well as over twenty short-lived explosions that have sent ash as high as 20,000 feet above sea level.

Update in Common Alerting Protocol (CAP) format