Short-lived explosion at Shishaldin, heightened level of unrest, Alaska

A short-lived explosion occurred at Shishaldin volcano, Alaska, U.S. at 16:10 UTC (07:10 LT) on December 12, 2019.

The eruption lasted about 3 minutes and produced an ash cloud up to 6 - 7.6 km (20 000 - 25 000 feet) above sea level, moving W-NW at 83 km/h (52 mph). In addition, three lightning strokes were detected, AVO reports.

Shishaldin remains at Aviation Color Code ORANGE and Alert Level WATCH.

The volcano remains at a heightened level of unrest and explosions may occur with little warning, AVO said.

Shishaldin is monitored by local seismic and infrasound sensors, satellite data, a web camera, a telemetered geodetic network, and distant infrasound and lightning networks.

Geological summary

The beautifully symmetrical volcano of Shishaldin is the highest and one of the most active volcanoes of the Aleutian Islands. The 2857-m-high (9 379 feet), glacier-covered volcano is the westernmost of three large stratovolcanoes along an E-W line in the eastern half of Unimak Island.

The Aleuts named the volcano Sisquk, meaning "mountain which points the way when I am lost." A steady steam plume rises from its small summit crater. Constructed atop an older glacially dissected volcano, it is Holocene in age and largely basaltic in composition.

Remnants of an older ancestral volcano are exposed on the west and NE sides at 1 500 -1 800 m (4 920 - 5 900 feet) elevation. There are over two dozen pyroclastic cones on its NW flank, which is blanketed by massive aa lava flows.

Frequent explosive activity, primarily consisting of strombolian ash eruptions from the small summit crater, but sometimes producing lava flows, has been recorded since the 18th century. (GVP)

Featured image: Shishaldin on November 1, 2019. Credit: ESA/Sentinel-2, Antonio Vecoli


Tornado hits San Carlos in Tamaulipas, Mexico

May 28, 2020

A tornado struck the municipality of San Carlos in Tamaulipas, Mexico, on Sunday, May 24, 2020. Prior to the storm's formation, the National Water Commission warned of tornado and rains with gusts exceeding 70 km/h (43 mph) in the states of Tamaulipas, Nuevo...

More than 30 000 affected by flooding in East Kalimantan, Indonesia

May 27, 2020

Floods in Samarinda City, East Kalimantan Province, Indonesia over the past couple of days affected 30 894 people, the disaster management (BPBD) reported on May 25. Inundations started from around May 22, following a period of heavy rain, affecting four...

Millions of cicadas expected to emerge in parts of eastern U.S. after 17 years underground

May 26, 2020

After spending 17 years underground, as many as 1.5 million cicadas per acre may emerge in parts of the eastern U.S. this year, Virginia Tech said in a news release. Residents in Southwest Virginia, parts of North Carolina, and West Virginia could witness such a...

Record late May snowfall hits Idaho Falls, U.S.

May 25, 2020

Several inches of snow fell in Idaho Falls on Saturday, May 23, 2020, with preliminary totals showing that the area accumulated 51 to 102 mm (2 to 4 inches)-- the most snow recorded this late in spring, according to the National Weather Service (NWS). "While...

Rare tornado hits Sumatra, killing 2 people and damaging 245 homes

May 22, 2020

A rare tornado tore through several villages on Indonesia's Sumatra island on Wednesday, May 20, 2020. At least two fatalities, 6 people injured, and 245 damaged homes were confirmed on Thursday, May 21. The storm hit the Tulang Bawang district of Lampung...


Comments

No comments yet. Why don't you post the first comment?

Post a comment

Your name: *

Your email address: *

Comment text: *

The image that appears on your comment is your Gravatar