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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

https://tinyurl.com/yxygq4q4

Papua New Guinea volcano erupts, forcing villagers to flee

Volcano Alert

An island volcano on the north coast of Papua New Guinea erupted early on Saturday, forcing 2,000 villagers to flee from lava flows, the National Disaster Centre said.

Manam Island, just 10 km (6 miles) wide, is one of the Pacific nation’s most active volcanoes and is home to roughly 9,000 people.

Three villages were directly in the path of the lava flow and residents had to be evacuated to safer ground, Martin Mose, director of the PNG National Disaster Centre, told Reuters by phone.

The Rabaul Volcano Observatory (RVO) reported the eruption began at 6 a.m. local time (2000 GMT Friday), sending an ash column 15 km (50,000 feet) above sea level.

The ash falls were so heavy that trees broke under the weight, the RVO said in an information bulletin.

“The most affected areas are Baliau and Kuluguma and due to the very poor visibility caused by the ash fall, people are using torch light to move around,” it said.

The RVO’s Steve Saunders said it was an unusually large eruption.

“There are no casualties as far as we know but we are telling people to keep away from valleys for risk of mud flows … there’s a heavy thick blanket of ash on the flank and if there is heavy rainfall, we are making people aware of the threat,” he said by phone.

Saunders said the initial phase of the eruption was over but a new vent had opened, indicating more activity may be likely.

The Darwin Volcanic Ash Advisory Centre (DVAAC) issued a threat warning to aviation to reroute around the cloud, which was above the cruising level of commercial airlines.

The cloud was expected to dissipate over the next 12 hours, DVAAC meteorologist Amanda Alford told Reuters.

Previous eruptions on Manam have killed residents who breathed in the ash or were buried by landslides, according to volcanic information website volcanodiscovery.com.

Courtesy of uk.reuters.com

https://tinyurl.com/yb2ehjjp

Agung Volcano, Bali, Indonesia Alert Level Raised To Aviation Colour Code YELLOW

Volcano Alert

Agung volcano has erupted prompting the Aviation Colour Code Alert Level To YELLOW, due to volcanic eruption.

Courtesy of volcanodiscovery.com

 

Alert raised for Iceland’s Öræfajökull volcano, last eruption was in 1728

Aviation Yellow Alert
A new ice-cauldron has formed this week within the Öræfajökull volcano caldera, prompting the Icelandic Meteorological Office (IMO) to raise the aviation color code for the volcano to yellow. The last eruptive episode of this volcano started in August 1727 and ended in May 1727. A pilot flying over the area took pictures of the cauldron Friday, November 17, 2017 and sent them to the Icelandic Meteorological Office. The cauldron is about 1 km (0.62 miles) in diameter and it reflects a recent increase in geothermal activity within the caldera.
 
“It seems that geothermal water has been slowly released from underneath the cauldron to the glacial river of the Kvíárjökull outlet-glacier (SE flank of Öræfajökull volcano),” IMO said. “A sulfur smell, associated with this water release, has been reported nearby Kvíárjökull since last week. Most of the water has probably already been released.” The office has also registered an increase in the seismic activity in the last few months, but it has been low for the past days.
Courtesy of watchers.news

Flight alert raised in Iceland after ‘seismic swarm’ hits Katla volcano

Aviation Yellow Alert
Iceland has raised its warning level to aircraft after two earthquakes hit one of the country’s biggest volcanoes.
 
The Icelandic Met Office said the quakes, one of which had a magnitude of 3.7, shook the Katla volcano in the south of the country.
 
They are the strongest tremors since quakes raised concerns over a possible eruption of Katla last month.
 
Meteorologists said an “intense seismic swarm” had been recorded since Thursday morning.
 
Earthquake swarms occur when sequences of quakes strike in a relatively short period of time.
 
The Myrdalsjokull glacier, which is part of the ice cap sealing the Katla volcano
The Myrdalsjokull glacier, which is part of the ice cap sealing Katla


The Icelandic Met Office said: “Due to the unusually high level of unrest at the Katla volcano, we raise the aviation colour code from green to yellow.”
 
Yellow is the second lowest of the four-colour warning scale.
 
The Katla volcano has not had a major eruption since the beginning of the last century, but scientists think a large eruption is overdue.
 
However, they admit it still might be decades before it happens.
 
Last month, the volcano was rocked by two quakes measuring 4.5 and 4.6 in magnitude, a level not recorded since 2011.
 
In April 2010, the nearby Eyjafjallajokull volcano erupted, causing a major part of Europe’s airspace to be closed for several days.
 
The ash cloud produced created the highest level of air travel disruption since the Second World War.
Courtesy of Sky News
 

China on yellow alert for Typhoon Malakas

Yellow Alert
CHINA’S meteorological authority issued a yellow alert for Typhoon Malakas on Saturday, forecasting strong winds and heavy rain.
 
Malakas, the 16th typhoon in 2016, was observed 135 kilometers off Taiwan’s east coast at 10 a.m. Saturday, bringing winds of up to 50 meters per second as it moved northwest, and it is expected to enter the East China Sea Saturday afternoon, the National Meteorological Center said.
 
Heavy rain will sweep parts of Zhejiang and Fujian provinces on the Chinese mainland as well as the central and north parts of Taiwan from Saturday to Sunday with up to 120 millimeters of rain expected, the center said.
 
Typhoon Malakas came hot on the heels of Typhoon Meranti, which has left at least 14 people dead and another 14 missing in southeast regions of China since it landed in Fujian Thursday morning.
 
China has a four-tier color-coded warning system for severe weather, with red the most serious, followed by orange, yellow and blue.
Courtesy of shanghaidaily.com

AVIATION COLOUR CODE: YELLOW AT SABANCAYA VOLCANO IN PERU

Newest satellite image
Buenos Aires VAAC issued the following report:
 
FVAG01 at 15:02 UTC, 17/08/16 from SABM
VA ADVISORY
DTG: 20160817/1200Z
VAAC: BUENOS AIRES
VOLCANO: SABANCAYA 354006
PSN: S1547 W07151
AREA: PERU
SUMMIT ELEV: 5967M
ADVISORY NR: 2016/036
INFO SOURCE: GOES13 – PILOT REPORT
AVIATION COLOUR CODE: YELLOW
ERUPTION DETAILS: VA REPORTED AT 17/1402Z
OBS VA DTG: 17/1415Z
OBS VA CLD: VA NOT IDENTIFIABLE FM SATELLITE DATA
WINDS FL180 340/06KT – FL210 350/10KT – FL230 340/15KT
Courtesy of volcanodiscovery.com

Ash Emissions Cause Airport To Close Down Temporarily At Nevado Del Ruiz Volcano In Colombia

Ash emission from Nevado del Ruiz yesterday
The volcano remains restless and produces intermittent ash explosions of varying size. An emission of ash yesterday forced the regional La Nubia airport to close down for a few hours and the volcano observatory reported a new pulse likely occurring a short time ago. 
 
While many emissions cannot be directly observed due to cloud cover, they have been rather frequent recently. Similar explosions were also observed on 17, 18, and 20 May when fine ash fall occurred in Manizales town 30 km northwest of the volcano. 
 
According to SGC (Colombian Geological Survey), the volcano’s seismic activity remains elevated at fluctuating levels, but has been showing a slight decrease overall during the past weeks. It continues to be dominated by internal fluid movements which reflect the interaction of water and magmatic gasses at shallow depth that occasional results in explosions and more often in a strong degassing plume reaching up to 1500-2000 m height. 
 
A particular kind of seismic activity – so-called drum-beat signals – were also observed on 13 May. These are short regular pulses of tremor believed to result from regular sudden, stick-slip movements of viscous magma inside a conduit. 
 
The volcano’s alert level remains at “yellow” on the 4 color Colombian scale.
Courtesy of volcanodiscovery.com