Alaska volcano eruption warning: Why scientists are on alert – MULTIPLE earthquakes

Yellowstone: 'Swarm of earthquakes' spotted around volcano

We use your sign-up to provide content in ways you’ve consented to and to improve our understanding of you. This may include adverts from us and 3rd parties based on our understanding. You can unsubscribe at any time. More info

Alaska is home to several volcanoes, many of which have been put on alert by the authorities recently. As of August 11, the Alaska Volcano Observatory (AVO) has issued varying alerts for the Pavlof, Semisopochnoi, Cleveland, Great Sitkin and Atka volcanoes.

The AVO recently issued an ‘advisory’ volcano alert level and a yellow aviation colour code for the Atka volcanic complex volcano.

The AVO said in its latest update: “Numerous small earthquakes were detected 3 to 6km (1.9 to 3.7 miles) deep and around 7 km (4.3 miles) southwest of Korovin Volcano.”

The AVO said although the earthquakes suggest increased background seismic activity, it may not “necessarily lead to an eruption”.

But the AVO has issued warnings that eruptions could be possible at other Alaskan volcanoes which are currently under warning.

The Great Sitkin volcano is under a ‘watch’ volcano alert level and orange aviation colour code after small earthquakes were detected at the site over the last day.

The AVO warned an explosive eruption at Great Sitkin can occur with “little or no warning”.

The AVO said in its August 11 update: “Elevated surface temperatures and small earthquakes were detected over the past day at Great Sitkin Volcano consistent with continued growth of a lava dome.

“A steam and gas plume could be seen drifting east from the summit. No explosions or ash emissions were detected.

“There is no indication of how long lava effusion will continue during the current eruption, and it is possible that explosive activity could occur with little or no warning.

“Great Sitkin Volcano is monitored by local seismic and infrasound sensors, satellite data, web cameras, and remote infrasound and lightning networks.”

Explosions have also been detected at the Semisopochnoi volcano recently, with Semisopochnoi being the largest subaerial volcano of the western Aleutians.

Also under a ‘watch’ volcano alert level and orange aviation colour code, several explosions were detected at Semisopochnoi’s North Cerberus crater over the last day.

DON’T MISS:
UK experts warn 7 ‘pinch points’ could spark global volcanic disaster [ANALYSIS]
More than 1,000 earthquakes rocked Yellowstone volcano in July [REPORT]
Alaska’s Great Sitkin volcano under watch for ‘explosive activity’ [INSIGHT]

The AVO said: “Small eruptions producing minor ash deposits within the vicinity of the active north crater of Mount Cerberus and ash clouds under 10,000 feet above sea level have characterised the recent activity and show no signs of abating.

“Small explosions may continue and could be difficult to detect especially during poor weather conditions.”

As of August 11, the Pavlof Volcano is also currently under an alert level ‘watch’ and an aviation colour code of orange.

The AVO said “several small explosions” were detected by sensors at the Pavlof Volcano over the past day.

The AVO also reported “small ash emissions”, though this ash appeared to “quickly dissipate”.

Chris Waythomas, a geologist with the Alaska Volcano Observatory, told ABC News last week Pavlof is a “very sneaky volcano”, adding: “It can get going without much warning.”

The Cleveland volcano is under an ‘advisory’ volcano alert level and a yellow aviation colour code.

The AVO said “no evidence of explosive activity was detected” at the site but warned “lava effusion and explosions” can happen without “advance warning”.

Source: Read Full Article