quote:Mayor eruption Bezymianny
A major explosive eruption took place at Russia's Bezymianny volcano at 04:53 UTC on Friday, June 16, 2017. By 05:10 UTC, ash plume from the eruption reached an altitude of 12.2 km (40 000 feet) above sea level and a distance of 40 km (25 miles) NE of the volcano, according to the Tokyo VAAC. This is the strongest eruption of this volcano since September 2012.
At 05:43 UTC, KVERT said they raised the Aviation Color Code from Orange to Red. "Ash cloud as big as 28 x 25 km (17.4 x 15.5 miles) drifts to the northeast of the volcano," the Observatory said, adding that ash explosions up to 10 - 15 km (32 800 - 49 200 feet) a.s.l. could occur at any time. "Ongoing activity could affect international and low-flying aircraft.
This is the strongest eruption of Bezymianny volcano since September 1/2, 2012. It comes just two days after a powerful eruption of nearby Sheveluch volcano ejected ash to an altitude 12 km (39 360 feet) a.s.l. Sheveluch is located 90 km (56 miles) NE of Bezymianny.
The last significant eruption of Bezymianny volcano, although nowhere near today's, took place on March 9, 2017. Based on webcam observations, an ash plume rose to altitudes of 6 - 7 km (20 000 - 23 000 feet) a.s.l. and drifted 20 km (12.4 miles) northeast. The Aviation Color Code was raised from Yellow to Orange. About 30 minutes later, an ash plume rose to altitudes of 7 - 8 km (23 000 - 26 200 feet) a.s.l. and drifted 60 km (37 miles) northwest. Later that day a 274-km-long (170 miles) ash plume identified in satellite images drifted NW at altitudes of 4 - 4.5 km (13 100 - 14 800 feet) a.s.l.; the majority of the leading part of the plume contained a significant amount of ash. A lava flow traveled down the NW part of the lava dome.
Bezymianny is one the most active volcanoes in the world. In 1955, for the first time in history, it started to erupt, and after six months it produced a catastrophic eruption with the total volume of eruptive products over 3 km3.
The lava dome began to grow in the explosive caldera immediately after the catastrophe and still continues. At least 44 Vulcanian-type strong explosive eruptions of Bezymianny occurred between 1965 - 2012.
quote:Increased seismic activity at underwater Lō‘ihi volcano, Hawaii
Since the end of February 2017, the Hawaii Volcano Observatory (HVO) seismic analysts have noted a slight uptick in the number of earthquakes near underwater Lō‘ihi volcano. The quakes appear to be clustered roughly 10 to 12 km (6 - 7 miles) below sea level and extend from beneath the summit region of Lō‘ihi to the south. The most recent confirmed eruption of this volcano occurred in 1996.
From January 2015 through February 2017, there was, on average, one located Lō‘ihi earthquake per month. Since then, the rate of earthquakes has gradually increased. As of June 22 (the last HVO update on this matter), there have been 51 located earthquakes in the Lō‘ihi region.
"Without permanent seismic stations at Lō‘ihi, because the highest point of the volcano is 1 km (0.62 miles) underwater, it is not possible to locate earthquakes there as accurately as we can at Kīlauea or Mauna Loa," HVO said. "However, we can state that the June 2017 earthquakes appear to be clustered roughly 10 - 12 km (6 - 7 miles) below sea level and extend from beneath the summit region of Lō‘ihi to the south."
Interestingly, the roughly 170 earthquakes located in the area of Lō‘ihi between 2010 and 2016 occurred away from the summit region. They were primarily beneath the northern flanks of Lō‘ihi, and extended to significantly greater depths below the volcano. The significance of this difference is unclear, HVO says.
As early as 1952, HVO scientists interpreted occasional earthquake swarms in the Lō‘ihi region as reflecting active volcanism there. In fact, the earthquakes were key to recognizing that the seamount is actually an active volcano.
Earthquake activity alone does not conclusively indicate that Lō‘ihi is erupting. But the locations of recent earthquakes directly beneath the volcano's summit region plausibly suggest magmatic or volcanic origin, such as adjustments within the magma reservoir or volcanic edifice. "We would, however, expect to see many more earthquakes associated with an eruption," the observatory notes.
The most recent confirmed eruption of Lō‘ihi occurred in 1996. That year, an energetic earthquake swarm began in July and quickly intensified, motivating a scientific expedition to Lō‘ihi to seize an unprecedented opportunity to possibly observe a submarine eruption. Thousands of earthquakes, including over a dozen with magnitudes greater than 4.5, were recorded from beneath the summit and south flank of the volcano between July and September 1996.
Subsequent viewing and mapping of the Lō‘ihi summit region showed that, consistent with magma movement from beneath the summit area, a significant portion of it had collapsed. Fresh pillow lavas and glassy fragments collected during submersible dives also confirmed the occurrence of an eruption.
"Because Lō‘ihi is still so deep beneath the ocean's surface, the USGS regards Lō‘ihi as a low- to very low-threat volcano. Thus, there are no immediate plans for additional monitoring instruments and our views of Lō‘ihi for the foreseeable future will be strictly seismological," the observatory concluded.
quote:Mexican earthquake triggers eruption
Just as a devastating 7.1 magnitude earthquake rocked Mexico, the nation’s famed Popocatepetl volcano erupted, sending a plume of smoke in the air.
At the time of the eruption, a church in the town of Atzitzihuacan which is located on the slopes of the volcano, collapsed during the mass earthquake, killing 15 according to Reuters. The volcano is located just 40 miles southeast of Mexico City and can be seen from the capital city when the weather is clear.
Geologist and Forbes contributor Trevor Nace says it probably is not a coincidence that the eruption occurred shortly after the earthquake. “The volcanic eruption likely was triggered by shaking caused by the earthquake,” wrote Nace in an article in Forbes.
However, Mexico’s National Center for the Prevention of Disasters (Cenapred), which classified the eruption as “low-level” disputes that assertion.
“It is important to note that no significant increase has been observed in the activity of the volcano that can be related to the earthquake of magnitude 7.1, registered on September 19 with an epicenter in the state of Puebla,” wrote the agency (translated) in a press release.
Popocatepetl, which at 17,800 feet is North America’s second tallest volcano, is incredibly active.
After being largely dormant for most of the 20th century, it roared back to life in 1994 and has been irregularly but consistently active since then, according to Volcano Discovery.
According to the Cenapred website, Popocatépetl volcano emitted 299 low-intensity exhalations and an explosion during the same 24-hour period in which the earthquake occurred. During that same time, it also caused 6 volcano-tectonic earthquakes with magnitudes between 1.2 and 1.8.
On early Monday morning, before the earthquake, the volcano emitted a fumarole that shot ash 3 kilometers in the air.
Psstquote:Op donderdag 21 september 2017 14:25 schreef Ener-G het volgende:
Gunung Agung op Bali schijnt ook op knappen te staan:
quote:Vanuatu prepares to evacuate 5000 as Ambae volcano erupts
A web camera picture of the Ambae Volcano in Vanuatu on Saturday morning.A web camera picture of the Ambae Volcano in Vanuatu on Saturday morning. Photo: Vanuatu Geohazards Department
Authorities in Vanuatu were preparing to evacuate as many as 5000 people on Saturday, as a volcanic eruption on Ambae island continued to intensify.
The country's Geohazards Department on Saturday raised its alert from level three to four, what it classified as a "moderate eruption state."
The volcano is one of the most active in the world, but its activity has steadily increased in the past couple of weeks, said Esline Garaeviti, the manager of the Geohazards Department. On Saturday, that increased further, with the volcano belching ash across much of the 400sqkm island.
"In the early hours, around 3-4am, we noticed that the activity started to increase, followed by another eruptive phase," said Ms Garaeviti. "So the ash plume from Ambae is still there now. The ash fall is expected all around the island."
"The increased level of activity means increased area of risk," she said. "There's more risk exposed to people on the island, that's why. It's a moderate state of activity."
Ms Garaeviti stressed that the state of the eruption was only moderate, but there was every chance it could increase. However, authorities on the island, which sits between Santo and Pentecost about halfway up the archipelago, were swinging into action on Saturday.
Shadrack Welegtabit, the director of the Vanuatu National Disaster Management Office, said his officials weren't taking chances, and were preparing to start evacuating half of the island's 10,000 people from one side to the other.
"We are looking at moving people away from the south and north of the island, and moving them to the eastern and western part. We are working closely with the [Penama] Provincial Government on the ground arrangements," said Mr Welegtabit.
"It will be a big operation. We are talking about roughly 5,000 people that we have to move," he said. "Once all the ground arrangements is done in terms of preparing evacuation centres and stuff then we are looking at moving people. That is going to happen very soon."
"There has been a lot of ash fall in recent weeks, but as of last night there was a small eruption and people could see fire for the first time on that volcano," he said.
The last time there was a significant eruption on Ambae was in 2005, when a similar evacuation was carried out. It was as long as three months before people were able to return to their villages.
Both Ms Garaeviti and Mr Welegtabit said it was difficult to say whether the volcano's activity would intensify or start to settle down in coming days, but that every precaution was being taken.
quote:Vulkaan barst uit op Vanuatu: duizenden geëvacueerd
Op de eilandenstaat Vanuatu, ten oosten van Australië in de Stille Oceaan, is de noodtoestand uitgeroepen. Een vulkaanuitbarsting heeft de helft van de bevolking van het eiland Ambae gedwongen om toevlucht te zoeken tot nabijgelegen dorpen. De autoriteiten bereiden zich voor op een ergere uitbarsting. Mogelijk wordt het hele eiland geëvacueerd, meldt Radio New Zealand.
De vulkaan Manaro in het midden van het eiland is al weken actief. Sinds het weekend is die activiteit sterk verhoogd met uitbarstingen. Een groot deel van Ambae ligt onder as.
Circa 5.000 dorpsbewoners van het noorden en zuiden van het eiland zijn geëvacueerd naar het oosten en westen, in kampen van het rampenbeheer van Vanuatu.
,,Tot dusver heeft de vulkaan as en donkere rook uitgespuwd, met een beetje lava", vertelt Manuel Amu, de voorzitter van het rampenbeheercomité, aan de radiozender. Volgens die zender groeit de schrik bij de geëvacueerden omdat er steeds minder onderdak overblijft. Daarnaast maakten omwonenden melding van luidere uitbarstingen.
Ik ben deze vulkaan al een paar dagen aan het stalken en nu lijkt ie toch te gaan knallen.quote:Op woensdag 27 september 2017 14:26 schreef wattel het volgende:
De Popocatépetl vulkaan in Mexico is behoorlijk actief nu.
Kyushu's Mount Shinmoedake blew its stack for the first time in six years early Oct. 11, sending a plume of ash 300 meters into the air.
The eruption, although minor, followed the Japan Meteorological Agency's decision Oct. 5 to raise the volcano’s activity alert to Level 2, warning climbers to stay away from the crater.
The level was raised again Oct. 11 to Level 3, warning people to stay away from the mountain. It was the first such warning since October 2013 amid fears of a larger eruption that could hurl large cinders two kilometers from the crater.
No flying cinders were evident this time around.
The volcano, part of the Kirishima range in southern Kyushu, straddles the border of Miyazaki and Kagoshima prefectures. It previously erupted Sept. 7, 2011.