Articles tagged "alaska"

semisopochnoi july 21 2021 avo f

Multiple, discrete, energetic explosion signals at Semisopochnoi volcano, Alaska

Unrest under Semisopochnoi volcano increased at the end of July, with a marked increase in seismicity on July 31. Increased activity has also been detected on local infrasound stations, suggesting possible low-level (below 3 km / 10 000 feet above sea level)...

August 03, 2021

alaska earthquake july 29 2021 f

Massive M8.2 earthquake hits near the coast of Alaska, tsunami warnings issued

A massive shallow earthquake registered by the USGS as M8.2 hit near the coast of Alaska at 06:15 UTC on July 29, 2021. The agency is reporting a depth of 32.2 km (20 miles). EMSC is reporting it as M8.2 at depth of 30 km (18.6 miles). This is the strongest...

July 29, 2021

great sitkin july 22 2021 SWIR sentinel 2 f

Magma rising at Great Sitkin volcano, Alaska

A lava dome-like feature formed in the summit crater of Great Sitkin volcano, Alaska, suggesting magma is rising near the surface. As a result, the Alaska Volcano Observatory (AVO) has raised the Aviation Color Code to ORANGE and the Volcano Alert Level to WATCH. A...

July 24, 2021

semisopochnoi june 8 2021 f

Semisopochnoi Aviation Color Code raised to Orange, Alaska

The Alaska Volcano Observatory (AVO) has raised the Aviation Color Code for Semisopochnoi volcano to Orange and the Volcano Alert Level to Watch on July 12, 2021. The decision was made due to the onset of continuous volcanic tremors and detections of explosive...

July 14, 2021

gareloi volcano may 23 2021 f

Increased seismic activity at Gareloi volcano, Aviation Color Code raised to Yellow, Alaska

A slight increase in seismic activity was observed at Gareloi volcano, Alaska on May 18, 2021, and beginning May 27 there has been a sustained increase in the rate and size of small volcanic earthquakes. Because the level of seismic activity is now above the...

June 08, 2021

alaska earthquake m6 1 may 31 2021 f

Strong M6.1 earthquake hits Alaska, U.S.

A strong earthquake registered by the USGS as M6.1 hit Alaska at 06:59 UTC on May 31, 2021, at a depth of 58.2 km (36 miles). EMSC is reporting the same magnitude and depth. The epicenter was located 76.2 km (47.3 miles) N of Chickaloon (population 272), 128.3 km...

May 31, 2021

great sitkin eruption may 26 2021 by tyler ellis f

First significant explosion at Great Sitkin since 1974, Alaska

A short-lived explosive eruption began at Great Sitkin volcano, Alaska at 05:04 UTC on May 26, 2021, and lasted for about 1 to 2 minutes. The Aviation Color Code was raised to Red at 05:30 UTC. This was the first significant explosion at the volcano since 1974. The...

May 26, 2021

semisopochnoi may 17 2021 sentinel 2 f

Explosions detected at Semisopochnoi volcano, Aviation Color Code raised to Orange, Alaska

Several small explosions were detected at Semisopochnoi volcano, Alaska on May 18, 2021, and a small ash cloud was observed in a satellite image acquired at 23:21 UTC on May 17. As a result, the Alaska Volcano Observatory (AVO) has raised the Aviation Color Code to...

May 19, 2021

great sitkin coastline june 21 2019 f

Elevated temperatures and gas emissions at Great Sitkin volcano, Alaska

Above-background activity has been observed at the Great Sitkin volcano in Alaska, prompting the Alaska Volcano Observatory to raise the Aviation Color Code to Yellow and the Volcano Alert Level to Advisory on May 13, 2021. Elevated surface temperatures have been...

May 13, 2021

semisopochnoi volcano ash 0200z april 22 2021 f

Increase in eruptive activity at Semisopochnoi volcano, Alaska

Eruptive activity at Semisopochnoi has gradually increased over the last 24 hours, the Alaska Volcano Observatory (AVO) reported at 21:48 UTC on April 22, 2021. Satellite views of the volcano show a continuous plume extending 80 km (50 miles) to the south at...

April 23, 2021

ash produced by semisopochnoi volcano april 15 2021 f

Sustained ash emissions at Semisopochnoi volcano, Aviation Color Code raised to Red, Alaska

The Alaska Volcano Observatory (AVO) has raised the Aviation Color Code to Red and the Alert Level to Warning for Semisopochnoi volcano on Friday, April 16, 2021, after sustained ash emissions rose up to 6 km (20 000 feet) a.s.l. Satellite data suggest ash emissions...

April 16, 2021

veniaminof march 24 2021 f

Renewed activity at Veniaminof volcano, Aviation Color Code raised to Orange, Alaska

Low-level ash emissions from the summit of Veniaminof volcano, Alaska were observed in web camera views on April 5, 2021, the Alaska Volcano Observatory (AVO) reported at 20:49 UTC. Because of the renewed activity, AVO has raised the Aviation Color Code to ORANGE...

April 06, 2021

shumagin gap alaska f

Unexpected strike-slip earthquake uncovers hidden mechanism

Researchers uncovered the reason for unexpected strike-slip earthquakes, where two pieces of crust slide past each other on a fault, in areas where subduction zone tremors are common. From July to October 2020, a series of earthquakes occurred in Shumagin Islands,...

March 27, 2021

cleveland volcano march 16 2021 f

Increased gas emissions and elevated surface temperatures at Cleveland volcano, Alaska

The Alaska Volcano Observatory (AVO) has raised the Aviation Color Code for Cleveland volcano to Yellow and the Volcano Alert Level to Advisory at 21:44 UTC on March 20, 2021. Satellite detections of increased volcanic gas emissions and elevated surface temperatures...

March 21, 2021

semisopochnoi february 2021 f

Small explosion at Semisopochnoi volcano, Aviation Color Code raised to Orange, Alaska

Regional infrasound sensors detected a small explosion at Semisopochnoi volcano, Alaska on March 19, 2021, indicating an increase in eruptive activity. As a result, the Alaska Volcano Observatory (AVO) has raised the Aviation Color Code to ORANGE and the Volcano...

March 19, 2021

veniaminof march 4 2021 ashy eruption f

Veniaminof volcano alert level raised after sensors detect small explosion, Alaska

The Alaska Volcano Observatory (AVO) has raised the Volcano Alert Level to Watch and the Aviation Color Code to Orange for Veniaminof volcano at 18:04 UTC on March 4, 2021. The last time this volcano erupted was in 2018 (VEI 1). According to Volcano Observatory...

March 04, 2021

us avalanche feb 2021

At least 15 dead as the U.S. sees the deadliest week of avalanches in over a century

At least 15 people lost their lives due to avalanches in the U.S. from January 30 to February 6 this year-- the worst and deadliest in the country since 1910, according to the Colorado Avalanche Information Center (CAIC). It included avalanches in Alaska,...

February 09, 2021

semisopochnoi ash deposits landsat 8 2301z february 7 2021 f

Aviation Color Code for Semisopochnoi volcano raised to Orange, Alaska

A high-resolution satellite image acquired on February 7, 2021, shows a second small ash deposit extending at least 3 km (1.8 miles) to the northeast from North Cerberus Crater on Semisopochnoi Island, similar to the first observed on February 6. Clouds obscured...

February 09, 2021

semisopochnoi alaska feb 6 2021 f

Renewed unrest at Semisopochnoi, alerts raised, Alaska

High-resolution satellite imagery acquired on February 6, 2021, showed a small ash deposit extending less than 3 km (1.8 miles) to the north from North Cerebus Crater on Semisopochnoi Island, Alaska, U.S. Steam emissions obscured views into the crater, the Alaska...

February 07, 2021

goes west 1950z jan 5 2020 f

Powerful winter storms bring severe winds and snow to Alaska, Pacific Northwest and Canada

A powerful winter storm is set to blast Southeast Alaska with hurricane-force winds on Wednesday, January 6, 2021. New storms are expected to form in the days ahead, bringing severe winds, snow, and major waves to the region. An ongoing La Niña is resulting...

January 06, 2021

alaska earthquake january 3 2021 f

Shallow M6.1 earthquake hits Andreanof Islands, Alaska

A strong and shallow earthquake registered by the USGS as M6.1 hit the Andreanof Islands, U.S. at 12:38 UTC on January 3, 2021. The agency is reporting a depth of 17 km (10.5 miles). EMSC is reporting M6.1 at a depth of 48 km (30 miles). The epicenter was located...

January 03, 2021

extratropical storm dec 15 2020 6

Extratropical storm to bring severe winds, waves, and heavy precipitation to Southeast Alaska

An extratropical storm moving northeast across the North Pacific is forecast to bring major waves, strong winds, and heavy rains and snow to Southeast Alaska on Tuesday, December 15, 2020. The system has already generated significant wave heights that are being...

December 15, 2020

alaska volcanoes dec 10 2020

Six Alaskan volcanoes may be part of one massive supervolcano

Six stratovolcanoes comprising the Islands of Four Mountains in Alaska's central Aleutian Islands may not be separate volcanoes, but instead a part of one enormous volcanic caldera system, according to scientists who presented the evidence at the American...

December 10, 2020

haines landslide alaska dec 2 2020

Major landslide leaves at least 6 people missing in Haines, southeast Alaska

Six people went missing after a massive landslide, among many other smaller ones, hit the community of Haines in southeast Alaska following heavy rains, the Alaska State Troopers reported Wednesday, December 2, 2020. Up to 3 m (9 feet) of debris engulfed the area,...

December 03, 2020

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Shallow M6.3 earthquake hits Fox Islands, Alaska

A shallow earthquake registered by the USGS as M6.3 hit the Fox Islands, Alaska at 16:22 UTC on December 1, 2020, at a depth of 23 km (14.3 miles). EMSC is reporting M6.3 at a depth of 54 km (33 miles). The epicenter was located 40 km (25 miles) E of Nikolski,...

December 01, 2020

korovin volcano october 25 2020 f

Low-level seismicity continues at Korovin volcano, Alaska

Low-level seismicity continues at Korovin Volcano with no other signs of volcanic activity detected in infrasound sensors or partly cloudy satellite views, the Alaska Volcano Observatory (AVO) reported at 19:42 UTC on November 1, 2020. The last eruption at this...

November 02, 2020

korovin volcano july 27 2019

Korovin volcano alert level raised, Alaska

Increased seismicity and recent satellite detections of significant sulfur dioxide emissions forced the Alaska Volcano Observatory (AVO) to increase alert levels for Korovin volcano on October 28, 2020. The Aviation Color Code was raised to Yellow and Alert Level to...

October 28, 2020

alaska earthquake m7 5 october 19 2020 tsunami warning

Strong and shallow M7.5 earthquake hits south of Alaska, tsunami warning issued

A strong earthquake registered by the USGS as M7.5 hit south of Alaska at 20:54 UTC (12:54 LT) on October 19, 2020. The agency is reporting a depth of 40 km (25 miles). The epicenter was located 91.7 km (56.9 miles) SE of Sand Point (population 1 064) and 929.9 km...

October 19, 2020

barry arm landslide 2020

Massive, slumping mountainside in Barry Arm poses risk of catastrophic landslide and mega-tsunami, Alaska

A slow-moving landslide of an entire mountainside in Alaska's Barry Arm area may generate a mega-tsunami if the land suddenly collapses into the narrow fjord. Research findings show that the collapse would generate 11 times more energy and release 16 times more...

October 11, 2020

pavlof volcano alaska

Increased seismicity at Pavlof volcano, Alaska

Seismic activity at Pavlof volcano has increased on September 21, 2020, prompting the Alaska Volcano Observatory (AVO) to raise the Aviation Color Code to Yellow and Alert Level to Advisory. While this does not necessarily mean that an eruption is likely or...

September 22, 2020

alaska earthquake july 28 2020 f

M6.1 aftershock hits near the coast of Alaska Peninsula, U.S.

A strong aftershock registered by the USGS as M6.1 hit near the coast of Alaska Peninsula, U.S. at 08:03 UTC on July 28, 2020, at a depth of 41.3 km (25.6 miles). This is yet another aftershock of powerful M7.8 earthquake that struck at 08:12 UTC on July 22. USGS...

July 28, 2020

alaska earthquake july 22 2020 f

Major M7.8 earthquake hits near the coast of Alaska Peninsula, U.S. -- tsunami warning issued

A very strong and shallow earthquake registered by the USGS as M7.8 hit near the coast of Alaska Peninsula, U.S. at 06:12 UTC on July 22, 2020 (19:12 LT, July 21). The agency is reporting a depth of 28 km (17.4 miles). EMSC registered it as M7.8 at a depth of 30 km...

July 22, 2020

makushin volcano june 7 2018

Increased earthquake activity at Makushin volcano, Alaska

The Alaska Volcano Observatory (AVO) is recording increased earthquake activity at Makushin volcano over the past 2 weeks. In response, the observatory raised the Aviation Color Code to Yellow on June 15 and plans to continue close monitoring of seismic activity,...

July 01, 2020

veniaminof september 21 2019 f

Alerts raised after increased seismicity under Veniaminof volcano, Alaska

Over the past several days there have been periods of seismic tremor and occasional earthquakes at Veniaminof volcano, forcing the Alaska Volcano Observatory (AVO) to raise the Aviation Color Code to Yellow and the Volcano Alert Level to Advisory. The volcano has a...

June 19, 2020

makushin hot springs january 22 2020 f

Alerts raised after significant earthquakes under Makushin volcano in Alaska, U.S.

Two earthquakes with magnitudes larger than 4.0 were registered in the vicinity of Makushin volcano, Alaska over the past 12 hours, representing a significant departure from background earthquake activity. The last eruption of this volcano took place in 2005 (VEI...

June 16, 2020

shishaldin sentinel 2 march 12 2020 swir f

Surface lava, elevated seismicity at Shishaldin volcano - Aviation Color Code raised to Orange, Alaska

A high-resolution satellite image today shows lava and what appears to be a new cone within the Shishaldin summit crater, prompting the Alaska Volcano Observatory to raise the Aviation Color Code to ORANGE and the Alert Level to WATCH at 06:31 UTC on March 15, 2020....

March 16, 2020

semisopochnoi february 27 2020 f

Continuous tremor at Semisopochnoi volcano, Aviation Color Code raised to Orange, Alaska

Seismicity has been increasing over the last few days at Semisopochnoi volcano, Alaska and now is characterized by nearly continuous tremor and frequent small explosion signals. The situation represents a significant increase in activity and the Alaska Volcano...

March 16, 2020

semisopochnoi dec 11 2019 sentinel 2 f

Series of small explosions and tremor bursts at Semisopochnoi volcano, alerts raised

A series of small explosions and tremor bursts have been detected in seismic data at Semisopochnoi over the past 7 hours and are continuing, representing a significant uptick in activity, the Alaska Volcano Observatory (AVO) reported at 09:19 UTC on February 15,...

February 15, 2020

rat islands earthquake jan 26 2020 f

Shallow M6.1 earthquake hits Andreanof Islands, Alaska

A strong and shallow earthquake registered by the USGS as M6.1 hit Andreanof Islands, Alaska at 06:31 UTC on January 26, 2020 (18:31 LT, January 25). The agency is reporting a depth of 27 km (16.7 miles). EMSC is reporting M6.0 at a depth of 48 km (29.8 miles). The...

January 26, 2020

tanaga island earthquake january 23 2020 f

Shallow M6.2 earthquake hits near Tanaga Volcano, Andreanof Islands, Alaska

A strong and shallow earthquake registered by the USGS as M6.2 hit near Tanaga Volcano, Andreanof Islands, Alaska at 05:53 UTC on January 23, 2020 (19:53 LT, January 22). The agency is reporting a depth of 10 km (6.2 miles). EMSC is reporting M6.3 at a depth of 10...

January 23, 2020