© YouTube/Ruptly (screen capture)
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© Pacific Northwest Seismic Network
The tremors were strong enough for some locals to feel it, The Oregonian reported.
The earthquake rumbled at 8:51 p.m. June 5, just south of the summit of Mount Hood. It was preceded by several earthquakes in the hour before the quake, and tens of aftershocks have occurred since, the Cascades Volcano Observatory of the U.S. Geological Survey reported in a news release Saturday night.
The volcanic action and location are consistent with past swarms in the Mount Hood area, including a magnitude 4.5 on June 29, 2002, that was located about 1 mile east of Saturday's ground shaker.
Aftershocks will likely continue for hours or days, some of which may be felt, according to the news release.
© SEMANAEmergency in Antioquia due to the eruption of the mud volcano in Necoclí.
The entity pointed out that due to this situation it was necessary to transfer around 100 people from the Palmares de Ceniza village to a rural school in the Piedrecita village, where humanitarian care is provided.
The Voluntary Fire Department and the Civil Defense responded to the emergency, after the volcano expelled ash and boiling mud, as seen in some videos shared by the inhabitants of the area on social networks.
The aid organizations indicated that the 23 families were evacuated from the early morning when the high volcanic activity of that natural formation was identified until it erupted in the last hours.
Ozone depletion following the Toba eruption around 74,000 years ago compounded the ensuing volcanic winter and caused a human population bottleneck.
A catastrophic drop in atmospheric ozone levels around the tropics is likely to have contributed to a bottleneck in the human population around 60 to 100,000 years ago, an international research team has suggested. The ozone loss, triggered by the eruption of the Toba supervolcano located in present-day Indonesia, might solve an evolutionary puzzle that scientists have been debating for decades.
"Toba has long been posited as a cause of the bottleneck, but initial investigations into the climate variables of temperature and precipitation provided no concrete evidence of a devastating effect on humankind," says Sergey Osipov at the Max Planck Institute for Chemistry, who worked on the project with KAUST's Georgiy Stenchikov and colleagues from King Saud University, NASA and the Max Planck Institute for Chemistry.
"We point out that, in the tropics, near-surface ultraviolet (UV) radiation is the driving evolutionary factor. Climate becomes more relevant in the more volatile regions away from the tropics," says Stenchikov.
Large volcanic eruptions emit gases and ash that create a sunlight-attenuating aerosol layer in the stratosphere, causing cooling at the Earth's surface. This "volcanic winter" has multiple knock-on effects, such as cooler oceans, prolonged El Niño events, crop failures and disease.
© Karpov Oleg/ShutterstockThe eruption of the Toba volcano 74,000 years ago affected the planet's climate so drastically that it led to a drop in the human population.
"Toba has long been posited as a cause of the bottleneck, but initial investigations into the climate variables of temperature and precipitation provided no concrete evidence of a devastating effect on humankind," says Sergey Osipov at the Max Planck Institute for Chemistry, who worked on the project with KAUST's Georgiy Stenchikov and colleagues from King Saud University, NASA and the Max Planck Institute for Chemistry.
"We point out that, in the tropics, near-surface ultraviolet (UV) radiation is the driving evolutionary factor. Climate becomes more relevant in the more volatile regions away from the tropics," says Stenchikov.
Large volcanic eruptions emit gases and ash that create a sunlight-attenuating aerosol layer in the stratosphere, causing cooling at the Earth's surface. This "volcanic winter" has multiple knock-on effects, such as cooler oceans, prolonged El Niño events, crop failures and disease.
© YouTube/Global News (screen capture)
The eruption plume reached a height of about six kilometres above sea level. There was no impact on the operations of the nearby Catania International Airport.
Etna is the largest of Italy's three active volcanoes, which also include Stromboli, on the Sicilian island of the same name, and Vesuvius near Naples, which last erupted in 1944.
Etna is a popular tourist destination attracting hikers eager to see its extraordinary lava flows, which glow orange at night.
© YouTube/Adapt 2030 (screen capture)
© REUTERS/Djaffar Al KatantyA Congolese family evacuate from recurrent earth tremors as aftershocks following the eruption of Mount Nyiragongo volcano near Goma, in the Democratic Republic of Congo May 27, 2021.
On Friday morning, Goma, in eastern Democratic Republic of the Congo, was almost deserted, with shops closed and just a handful of people on the streets.
Ndima Kongba, the military governor of North Kivu province, ordered the evacuation of the city of 600,000 people on Thursday amid fears of further volcanic activity after Saturday's eruption.
Comment: Other volcanic and seismic activity of late:
- 2 separate earthquakes strike China - one of magnitude 7.3 - three dead, dozens hurt
- Alaska's Great Sitkin volcano erupts: US Geological Survey issues 'red warning' for aviation
- M4.2 quake shakes Lake Tahoe, comes amidst uptick in activity in region
- Ebeko volcano in the Kuril Islands, Russia throws ash to a height of 3 km
- Big eruption at Stromboli volcano, Italy
- Huge lava eruption at Fagradalsfjall volcano in Iceland
Great Sitkin volcano erupts
In a statement on Wednesday morning, the USGS said volcanic activity on Great Sitkin Island had been confirmed by geophysical data. The volcano started erupting at 21:04 on Tuesday, with an explosion that lasted a couple of minutes, and was continuing to erupt at the time of its latest update.
It had issued a joint 'red warning' to aviation with the AVO after observations suggested the ash plume was as high as 15,000ft (4,600m).
"Since that explosion, seismicity has decreased, and satellite images show that the ash cloud has detached from the vent and is moving towards the east," the AVO said in a recent update.
Nyiragongo volcano erupts in DR Congo triggering evacuation in Goma - Death toll reaches 32 - UPDATE
© REUTERS/Olivia AclandA general view shows smoke and flames at the volcanic eruption of Mount Nyiragongo near Goma, in the Democratic Republic of Congo May 22, 2021
The volcano began erupting around 7:00 pm local time on Saturday. Footage shared online shows Nyiragongo spitting smoke and fire into the air, turning the night skies red.
The Mount is located some 10 km (6 miles) north of Goma, a city of some 670,000 people, which in turn is only 1 km (0.6 mi) away from the Rwandan border.
Comment:
Update: Aerial images show the destruction to the region in east Democratic Republic of Congo after the nighttime eruption of Mount Nyiragongo sent thousands of terrified residents fleeing in panic.
More footage of the lava flows:
Update 2: AP reports on May 24:
Death toll from Congo volcano eruption rises to at least 32
Officials say the death toll from the volcanic eruption in eastern Congo two days ago has risen to at least 32 people, while residents search for missing loved ones amid destroyed homes on the outskirts of the eastern city of Goma where aftershocks were detected. The head of Civil Protection for the North Kivu province gave the updated death toll, saying it is likely to keep rising. Joseph Makundi says some people were killed by the lava, some from resulting car accidents and others from inhaling toxic gas released from the cooling lava. Mount Nyiragongo turned the sky fiery red Saturday night and spewed torrents of lava into villages, killing people and destroying more than 500 homes.
© APLava from the eruption of Mount Nyiragongo cuts through Buhene north of Goma, Congo, May 24, 2021.
The quake, measured at 5.3 magnitude by the Rwandan Seismic Monitor, was the largest of over 100 tremors that have followed the eruption on Saturday of Congo's Mount Nyiragongo volcano, one of the world's most active and dangerous.
"We know that children were injured when a building collapsed on Tuesday just a few steps from the UNICEF office in Goma," the U.N.children's agency said.
The quake appeared to have destroyed several buildings in the city of two million, and a witness said at least three people were pulled from the rubble and taken to hospital.
It struck at 11:03 a.m., originating in Rugerero sector in western Rwanda, according to the Rwanda Seismic Monitor.
Comment: A few days ago a significant earthquake swarm hit southern California.