Small explosion signals at Pavlof volcano, alerts raised, Alaska

Small explosion signals at Pavlof volcano, alerts raised, Alaska

Small explosion signals from Pavlof volcano have been detected on the infrasound network located at Sand Point and on the local seismic network on October 19, 2019.

It is unknown if the explosions produced any volcanic ash, but their small size suggests any hazard is currently confined to the area around the volcano's summit, the Alaska Volcano Observatory (AVO) reports.

Because these signals are above normal background for Pavlof, AVO is raising the Aviation Color Code to YELLOW and the Alert Level to ADVISORY.

Low-frequency seismic tremor and vigorous steam plume have been observed at Pavlof volcano, Alaska on May 14 and 15, 2019.

"While this does not mean that an eruption is likely or imminent, past eruptions of Pavlof occurred with little or no warning," AVO said at the time.

The last known eruption at this volcano took place in 2016 (VEI 2).

Geological summary

The most active volcano of the Aleutian arc, Pavlof is a 2 519-m-high (8 264 feet) Holocene stratovolcano that was constructed along a line of vents extending NE from the Emmons Lake caldera.

Pavlof and its twin volcano to the NE, 2 142-m-high (7 027 feet) Pavlof Sister, form a dramatic pair of symmetrical, glacier-covered stratovolcanoes that tower above Pavlof and Volcano bays.

A third cone, Little Pavlof, is a smaller volcano on the SW flank of Pavlof volcano, near the rim of Emmons Lake caldera.

Unlike Pavlof Sister, Pavlof has been frequently active in historical time, typically producing Strombolian to Vulcanian explosive eruptions from the summit vents and occasional lava flows. The active vents lie near the summit on the north and east sides.

The largest historical eruption took place in 1911, at the end of a 5-year-long eruptive episode, when a fissure opened on the N flank, ejecting large blocks and issuing lava flows. (GVP)

Featured image credit: USGS/AVO, David Fee


Rare 5 waterspouts in a row off of the New South Wales coast, Australia

May 05, 2021

Rare 5 waterspouts in a row were seen off of the New South Wales coast, Australia on May 4, 2021. The storm that spawned them also produced an intense hailstorm. The waterspouts formed off Old Bar beach, Harrington and recorded by Kirra Jane Moffitt. View this...

Waterspout recorded as it hits a beach in China's Guangdong Province

May 05, 2021

A rare waterspout was recorded in south Chinas Guangdong Province as it hit a beach on Hailing Island on Monday, May 3, 2021. Is that a dragon emerging from the sea? A rare #waterspout was captured by tourists on the sea surface by the beach of Hailing island,...

Unseasonal May snow falls in South Korea for the first time in 22 years

May 04, 2021

Up to 18.5 cm (7.3 inches) of snow fell in parts of Gangwon Province, South Korea, from Saturday evening to Sunday morning, May 1 to 2, 2021. It was the first time in 22 years that it has snowed in South Korea in the month of May. The Korea Meteorological...

Severe flooding hits Venezuela, including the capital Caracas

May 04, 2021

Heavy rains affecting parts of Venezuela over the past 7 days caused severe flooding along the San Pedro River, damaging more than 100 buildings and affecting around 400 families in the state of Merida, Tulio Febres Cordero municipality. Officials visited the...

Rare April snow falls in Brussels after unusually warm weather, Belgium

April 08, 2021

Snow fell in Brussels, Belgium, on Tuesday, April 6, 2021, which is considered an unusual weather event for this time of the year. The country, along with much of northwest Europe, previously experienced unusually warm weather and record temperatures at end of...


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