Indonesian volcano Mount Merapi spews massive ash in 2nd major eruption this month #MountMerapi #Indonesia #eruption
Indonesia’s most active volcano Mount Merapi erupted Friday, shooting a column of ash some 5,000 meters (16,000 feet) into the air in its second major eruption this month. Ash and sand covered areas several kilometers away from the peak of the rumbling crater near Indonesia’s cultural capital Yogyakarta.
Authorities did not raise Merapi’s alert level. “There has been no reports of damage from the eruption. We urge people to stay calm and not panic,” national disaster mitigation agency spokesman Agus Wibowo said.
Merapi erupted earlier this month, shooting a massive ash cloud some 6,000 meters in the air. That eruption coated Yogyakarta and neighboring city Solo with gray dust and forced an airport closure.
Mount Merapi’s last major eruption in 2010 killed more than 300 people and forced the evacuation of 280,000 residents. That was Merapi’s most powerful eruption since 1930, which killed around 1,300 people, while another explosion in 1994 took about 60 lives, AFP said.
Courtesy of rt.com
‘Throat of fire’ Tungurahua volcano signalling imminent, devastating COLLAPSE in Ecuador #Tungurahua #Volcano #magma #Ecuador
Scientists are warning that the Tungurahua volcano in Ecuador is showing early signs of impending catastrophic collapse, after satellite data showed substantial internal damage from ongoing magma activity.
Tungurahua, has been persistently active since 1999 so wear and tear was inevitable, especially given that the ‘Throat of fire,’ or ‘Black giant’ as the Quechua indigenous people named it, has already collapsed twice before thousands of years ago.
“Using satellite data we have observed very rapid deformation of Tungurahua’s west flank, which our research suggests is caused by imbalances between magma being supplied and magma being erupted,” says geophysical volcanologist James Hickey from the University of Exeter in the UK, whose worrying research was recently published.
Tungurahua previously collapsed at the end of the Late Pleistocene, after which it then rebuilt itself for thousands of years, before collapsing again about 3,000 years ago.
Such collapses can trigger massive landslides and pyroclastic flows, which can travel for tens of kilometers. For example, the collapse 3,000 years ago is thought to have laid waste to an area of roughly 80km sq (11,000 football fields).
Meanwhile, an eruption in 1999 forced the evacuation of some 25,000 people, so the impact on human life in the area should the volcano collapse again would be truly staggering.
The team admits, however, that magma supply is just one of many risk factors which should be closely monitored to mitigate risk and protect life in the area.
“Magma supply is one of a number of factors that can cause or contribute to volcanic flank instability, so while there is a risk of possible flank collapse, the uncertainty of these natural systems also means it could remain stable,” Hickey says.
Courtesy of rt.com
Taal volcano update: Eruption alert as 116 earthquakes hit Philippines volcano overnight #earthquake TaalVolcano #philippines
The Philippines volcano is showing signs of volcanic activity (Image: GETTY/UNOCHA)
The volcano alert level for Taal is 3, meaning geologists are braced for an eruption in a matter of weeks. According to the Philippine Institute of Volcanology and Seismology (PHIVOLCS), Alert level 3 represents a high level of volcanic unrest.
The alert is marked by sustained seismic activity, plumes of smoke belching from Taal as well as toxic gas emissions and the movement of magma underground.
On Friday, PHIVOLCS warned of 116 tremors were detected around Taal volcano in the 24 hours since midnight GMT (8am local time).
The Taal Volcano Network recorded, in addition, two low-frequency earthquakes, which could be a sign of molten rock entering the volcano.
PHIVOLCS warned: “These earthquakes signify magmatic activity beneath the Taal edifice that could lead to eruptive activity at the Main Crater.”
The agency warned the residents of Luzon Island to stay clear of the volcano in a 4.3-mile-wide radius.
Access to the danger zone is restricted in parts of Agoncillo, Laurel and Batangas.
According to the UN Office for the Coordination of Humanitarian Affairs, about 486,000 people have been affected by the erupting volcano since January 12.
On Friday, the fiery mountain sitting in the middle of Taal Lake was coughing up plumes of dirty steam and smoke.
The volcanic plumes were seen reaching heights between 1,640ft and 2,296ft, drifting in a southwest direction.
At the same time, PHIVOLCS said emissions of toxic sulphur dioxide (SO2) have dropped below instrumental detection.
Although eruptive activity has ceased since two blasts tore through Taal on January 12 and January 13 respectively, the volcano is still at risk of erupting.
Since January 12, Philippine Seismic Network (PSN) has recorded a total of 763 volcanic earthquakes around Taal.
The seismic activity was marked by fissures splitting the ground open on the southern parts of Luzon Island.
At least 177 of the quakes peaked at magnitudes between 1.2 and magnitude 4.2.
Between January 29 and January 31, the PSN recorded seven quakes between magnitude 1.7 and magnitude 2.5.
PHIVOLCS warned on Friday of more earthquakes, steam-driven eruptions, ashfall and lethal gases venting from the volcano.
The agency said: “DOST-PHIVOLCS recommends that entry into the Taal Volcano Island as well as into areas over Taal Lake and communities west of the island within a 7km radius from the Main Crater must be strictly prohibited.
“Local government units are advised to assess areas outside the 7km radius for damages and road accessibilities and to strengthen preparedness, contingency and communication measures in case of renewed unrest.
“People are also advised to observe precautions due to ground displacement across fissures, frequent ashfall and minor earthquakes.”
Riverside communities are at risk of lahars – fast-moving streams of mud, debris and volcanic ash mixed with water, particularly after heavy rainfall.
PHIVOLCS said: “Civil aviation authorities must advise pilots to avoid flying close to the volcano as airborne ash and ballistic fragments from sudden explosions and wind-remobilized ash may pose hazards to aircrafts.
“DOST-PHIVOLCS is closely monitoring Taal Volcano’s activity and any new significant development will be immediately communicated to all stakeholders.”
Courtesy of express.co.uk
Yellow Alert issued due to unusual rapid inflation beneath Mt. Thorbjorn on Reykjanes peninsula, Iceland #YellowAlert #MountThorbjorn #reykjanes #iceland
The map shows recent earthquake activity in the area. Mt. Thorbjorn is situated just above the black triangle which indicates one of IMO’s seismographs.
Inflation has been detected in the last few days. An earthquake swarm has been ongoing during the same period. A state of uncertainty has been declared. The aviation color code has been raised to yellow for Reykjanes.
An inflation has been detected since January 21st and is centred just west of Mt. Thorbjorn on Reykjanes peninsula. The inflation is unusually rapid, around 3-4 mm per day and has accumulated to 2 cm to date. It has been detected both on continuous GPS stations and in InSAR images. The inflation is most likely a sign of magma accumulation at a depth of just a few km. If magma accumulation is causing the inflation, the accumulation is very small, with the first volume estimate is around 1 million cubic meters (0,001 km3). This is the conclusion of a meeting held with the Scientific council of the Civil Protection at the IMO this morning.
Accurate measurements of crustal deformation on Reykjanes peninsula span approx. three decades. During this period no comparable signal has been measured. This is unusual for this period. An earthquake swarm has been ongoing, since January 21st, alongside the deformation signal just east of the inflation centre (northeast of Grindavík). The largest earthquakes occurred on January 22nd and were of M3,7 and 3,6. They were felt widely on the Reykjanes peninsula and all the way to Borgarnes region. The earthquake swarm is currently in decline. Swarms like this are common and not unusual by itself in the area. The fact that an inflation is occurring alongside the earthquake swarm is a cause for concern and closer monitoring.
The inflation is centred within an active volcanic zone
The inflation is occurring on plate boundaries and within the volcanic system of Svartsengi which is either considered a separate system or part of the Reykjanes volcanic system. The last known eruption was during Reykjanes fires, which occurred between 1210-1240 AD. Within that period a several eruptions occurred within that system, thereof there were three eruptions in Svartsengi system. The eruptions were effusive (non-explosive) fissure eruptions erupting on 1-10 km long fissures. No explosive eruptions are known from this system. The largest eruption in the swarm, from 13th century, formed Arnarseturshraun lava (estimated 0,3 km3 and 20 km2). Historically, the duration of these eruptions spans from a few days up to several weeks. Seismic activity is very common in this area and is linked to the plate boundaries, geothermal activity and possible magma intrusions. The largest earthquakes measured in this area are about M5.5.
Courtesy of en.vedur.is
Courtesy Aaron Merculieff
The National Weather Service issued a SIGMET aircraft safety alert as the ash plume from Shishaldin reached as high as 20,000 feet in elevation and extended up to 90 miles eastward from the volcano.
A lava flow is visible from the northeast flank of the volcano, with a large steam plume moving to the south-southeast visible in webcam imagery on Saturday.
A volcanic cloud is reported to extend up to 90 miles east from Shishaldin, located on Unimak Island in the eastern Aleutian Islands.
According to the U.S. Geological Survey, Shishaldin is one of the most actives volcanoes in the Aleutian volcanic arc — with 24 confirmed eruptions since 1775.
In April and May of 1999, an eruption at Shishaldin generated an ash column reaching 45,000 ft. about sea level.
Courtesy of ktuu.com