Increased seismicity, alerts raised for Pavlof volcano, Alaska

Increased seismicity, alerts raised for Pavlof volcano, Alaska

Seismic activity at Pavlof volcano, Alaska has increased over the past several days, forcing the Alaska Volcano Observatory to raise the Alert Level to Advisory and the Aviation Color Code to Yellow at 20:43 UTC on December 28, 2019. Pavlof is a snow- and ice-covered stratovolcano about 953 km (592 miles) southwest of Anchorage. With over 40 historic eruptions, it is one of the most consistently active volcanoes in the Aleutian arc. Pavlof's largest known historical eruption took place in 1911.

There is currently no observed eruptive activity or emissions from the summit.

Although the current seismic activity represents an increase from background levels, it does not necessarily mean that an eruption is likely or imminent. However, past eruptions of Pavlof occurred with little or no warning.

Small explosion signals 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 was confined to the area around the volcano's summit.

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

Its last known eruption took place from March 27 to July 30, 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: AVO/USGS, Chris Waythomas


Deep freeze - St. Petersburg breaks daily temperature record set in 1893, Russia

December 06, 2021

With the temperature dropping to -20.9 C (-5.8 F) on Sunday, December 5, 2021, the Russian city of St. Petersburg has broken its daily record set 128 years ago - in 1893. "Today, St. Petersburg set a new daily cold weather record. Temperatures in the Northern...

Heavy rains destroy over 5 million ha (12.4 million acres) of crops in 2021, India

December 01, 2021

Heavy rain in India has destroyed more than 5 million ha (12.4 million acres) of crops in 2021. Karnataka was the worst affected, with 1.4 million ha (3.5 million acres) of crop lost, followed by Rajasthan with 679 000 ha (1.68 million acres), West Bengal with 690...

Parts of northern Saudi Arabia covered in a layer of hail and snow

November 22, 2021

Parts of northern Saudi Arabia were covered in a fine layer of hail and snow on Sunday, November 21, 2021, as temperatures plummeted to approximately 7 °C (44.6 °F). One of the affected cities was Qurayyat, Al Jawf Province, located about 30 km (18 miles)...

Severe damage after cricket ball-sized hail hits Lydenburg, South Africa

November 16, 2021

A severe hailstorm classified by the South African Weather Service (SAWS) as a superstorm, hit the town of Lydenburg in Thaba Chweu Local Municipality, Mpumalanga highveld during the afternoon hours of Sunday, November 14, 2021. Some of the hailstones were larger...

Large methane emissions leaking from landfills close to the center of Madrid, Spain

November 12, 2021

High-resolution satellites have detected substantial quantities of methane leaking from two landfill sites close to the center of Madrid, Spain. Using data from the ESA's Copernicus Sentinel-5P mission combined with GHGSat’s high-resolution commercial...



REMOVE ADS AND SUPPORT OUR WORK

Producing content you read on this website takes a lot of time, effort, and hard work. If you value what we do here, please consider becoming a supporter.

OPEN AD-FREE ACCOUNT


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