Volcanoes

Indonesia's Anak Krakatau Volcanic Activity Increases to Almost 90 Eruptions Daily

Jakarta globe
Mon, 03 Sep 2012 00:00 UTC

© Reuters
Anak Krakatau in the Sunda Strait, 130 kilometers west of Jakarta, was created by the same tectonic forces that led to the 1883 Krakatoa eruption that killed tens of thousands of people.

Bandarlampung - Volcanic ash from the increasingly active Anak Krakatau has reached a number of areas in Lampung, prompting officials on Monday to issue a warning for local residents and tourists.

"The ash was carried by wind from the southeast to the south, reaching Bandarlampung," Nurhuda, who heads the observation and information section of the Meteorology, Climatology and Geophysics Agency (BMKG) in Lampung, said according to state news agency Antara.

Nurhuda said the ash fell over several subdistricts in Bandarlampung, about 130 kilometers away from Anak Krakatau.

"It is rather unusual for the dust to be this thick," said Juniardi, a resident of Bandarlampung who complained that the falling dust was also hampering visibility.

Officials warned that the ask posed health hazards and asked local residents to wear masks when going outdoors or driving motorcycles.

Large Explosive Eruption Reported at Kamchatka's Bezyianni Volcano

Volcano Discovery
Sun, 02 Sep 2012 11:38 UTC

Russia - A larger explosive eruption occurred at Bezyianni volcano in Kamchatka yesterday evening (1 Sep) around 19h15 GMT. The explosion produced an ash cloud rising to about 10 km altitude (flight level 340) and was first detected by Tokyo VAAC who sent out an ash-cloud aviation warning (major intercontinental routes pass this area).

The ash plume is rapidly drifting west and has already reached hundreds of kilometer length.

As of today (2 Sep), the eruption of the volcano is gradually finishing, but ash plumes are extending more 370 mi (600 km) to the east-north-east of the volcano. Ongoing activity could affect international and low-flying aircraft.

According to seismic data by KB GS RAS, the eruption began at 19:16 UTC on September 01, 2012. According to visual data, ash plumes rose up to 32,800 - 39,400 ft (10-12 km) a.s.l. at 19:30 UTC on September 01. According to seismic data, an explosive phase of eruption continued till 19:45 UTC on September 01, and later there was a volcanic tremor was registered about 2 hours.

There is no ash near Bezymianny volcano now, but ash plumes are extending to the east-north-east of the volcano about 550-600 km of the volcano (MTSAT at 2132 UTC on September 01).

Source: KVERT

Reclus Volcano in Chile Appears to be Reawakening as Earthquakes Felt in Nearby Towns

Volcano Discovery
Fri, 31 Aug 2012 12:05 UTC

Some unrest is going on at Reclus volcano in southern Chile, located between Aguilera and Monte Burney in Patagonia, the Eruptions Blog writes:

"Over the summer, earthquakes began to be felt in towns in the region of the volcano and a potential for new activity from the Reclus has prompted geologists to visit the volcano later this spring (southern hemisphere). Interestingly, one article mentions that an overflight of the volcano in 2008 spotted cracks on the glaciers that cover the volcano along with traces of ash. However, the direct connection between the seismicity in Patagonia and Reclus is still tenuous, so further observations of the remote volcano will need to be done."

Earthquakes Raise Alert Level at Alaska Volcano

Ben Anderson
Alaska Dispatch
Thu, 30 Aug 2012 01:27 UTC

A series of small earthquakes which began Wednesday night and continued into Thursday near a long-dormant volcanic peak in Alaska's Aleutian Islands has prompted researchers to raise the alert level for the Little Sitkin volcano.

The nearly 4,000-foot-high Little Sitkin volcano is named for the island where it resides, located in the Rat Islands in the Aleutian chain. The volcano has shown little activity since scientists have started observing it, with only three questionable eruptive events at the volcano since that time.

The most recent eruption may have come in 1900, according to the Alaska Volcano Observatory.

Still, the AVO page for Little Sitkin mentions there may have been a "cataclysmic eruption" on the island sometime after the last ice age, which ended more than 11,000 years ago.

Seismic equipment located near the volcano began detecting a "swarm of high-frequency earthquakes" at about 7:15 p.m. Wednesday, the AVO reports. The earthquakes continued through the night into Thursday, prompting the alert level at the volcano being raised. The alert level is currently at yellow, which means that the "volcano is exhibiting signs of elevated unrest above known background level." Additionally, aircraft traveling in the area are advised to exercise caution.

The volcano is located in a remote part of the Aleutians, about 35 miles northwest of the World War II outpost of Amchitka and 200 miles west of Adak.

Little Sitkin joins two other Alaska volcanoes, Iliamna and Cleveland, currently sitting at elevated alert levels.

Earthquake clusters detected at remote Aleutian volcano

Anchorage Daily News
Thu, 30 Aug 2012 14:53 UTC

Seismologists say a cluster of earthquakes has been detected at a remote volcano in Alaska's western Aleutian Islands. The Alaska Volcano Observatory says the quakes began Wednesday evening at Little Sitkin Volcano and are continuing as of Thursday morning. No eruption has been detected.

Scientist in charge John Power says there is no direct link to the swarm of earthquakes at Little Sitkin and a cluster of quakes that shook California's Imperial County this week.

Powers says Little Sitkin is on an uninhabited island and is far from any populated areas. He says the seismic activity is unusual for Little Sitkin, which may have last erupted in the early 1900s.

Powers says the concern about an eruption would be the possible threat posed to aircraft by airborne ash.

Peru's El Misti Volcano is Active, Says IGP

Manuel Vigo
Peru This Week
Tue, 28 Aug 2012 19:48 UTC

Peruvian geologists have revealed that recent activity at El Misti signal that the volcano is active.

Last Thursday researchers at the Geophysical Institute of Peru (IGP) found that El Misti - located 17km outside the city of Arequipa - had recently recorded the highest amount of seismic activity than in the past five years.

Engineer Orlando Macedo told El Comercio that 224 earthquakes were registered at El Misti - an event known as an earthquake swarm - and which signaled that the volcano was no longer dormant.

El Misti, he said, experienced 143 volcano tectonic earthquakes, which were caused by the fracture of rock inside the volcano, due to sudden changes in pressure and temperature.

Despite the recent increase in activity, the IGP said there were still no conditions for an eruption to occur at El Misti, which last erupted sometime between 1450 and 1470.

For an eruption to happen, Macedo said, El Misti would have to experience continued earthquakes, which "would have to occur after long-term movements of magma, and causing these earthquakes known as tremors, with lava."

Ecuador on Alert Over Spewing Tungurahua Volcano

Alison Martinez, Translated by Silvia Viñas
globalvoicesonline.org
Fri, 24 Aug 2012 03:18 UTC

The Tungurahua volcano, an icon and symbol of sovereignty for Ecuadorians, has been registering new activity since the night of August 12, 2012, when incandescence was spotted around the crater zone, as reported by the Geophysical Institute EPN (Polytechnic National School) [es].

The volcano has been spewing pyroclastic material and ash throughout this month, affecting 3,072 families, 4,329 acres of pasture and crops, and 5,700 animals, according to Ministry of Agriculture [es] officials at the time of writing this post.

The "Report on recent activity in the Tungurahua volcano", published on August 14 on the Geophysical Institute's official website, reported that the volcano's activity had remained "at a moderate to low level." However, on Sunday, August 5, two moderate explosions were registered, and from then on greater activity has been recorded during the rest of the month.

Alert level raised on previously extinct Colombian Sotará volcano: an eruption would be first known in recorded history

The Extinction Protocol
Sat, 25 Aug 2012 06:04 UTC

Sotara volcano looks set to erupt for first time in recorded history

According to INGEOMINAS, the Observatorio Vulcanológico and Sismológico de Popayán reported that during 8-14 August seismic activity at Sotará increased.

The seismic network recorded 110 magnitude 0.2-1.6 events mainly located in an area 0.1-5 km NE of the peak, at depths of 2-6 km. Inflation was detected in the NE area, coincident with the zone of increased seismicity.

Web-camera views showed no morphological changes.

The Alert Level was raised to III (Yellow; "changes in the behavior of volcanic activity"), or the second lowest level. (Smithsonian Institute)

Source: Earthquake Report

Ecuador authorities issue warning as Tungurahua volcano spews ash, gas

NBC News
Tue, 21 Aug 2012 06:30 UTC

Ecuadorian authorities are encouraging residents living near the Tungurahua volcano to evacuate due to increased activity, according to local media reports cited by Reuters. The volcano has been in an active state since October 1999.

© Gary Granja/Reuters
The Tungurahua volcano spews a large cloud of ash towards the nearby town of Bilbao, Ecuador, in the early hours of August 21, 2012.

Japan's Sakurajima volcano releasing largest amount of ash in 20 years: ground swollen around volcano

Radhika Seth
Japan Daily Press
Fri, 17 Aug 2012 08:57 UTC

Sakurajima Volcano has been steadily erupting for some time now. So much so that residents were asked to cover up and wear masks as a health and safety measure. According to researchers, this active volcano in Kagoshima Prefecture could release its largest amount of ash in two decades this year alone.

Going by the current stats available, the mountain has already spewed enough ash from January to July, amounting to twice the amount emitted in all of last year. Masato Iguchi, a professor at the Sakurajima Volcano Research Center said that last year saw a record number of eruptions as well. The ground around Sakurajima indicates the buildup of magma and appears swollen.

And if Sakurajima keeps being as active it is right now, we can expect the amount of ash expelled to be a new record. In the past two decades this year's activity of explosions and ash fall have both risen dramatically.

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Volcanoes

Indonesia's Anak Krakatau Volcanic Activity Increases to Almost 90 Eruptions Daily

Large Explosive Eruption Reported at Kamchatka's Bezyianni Volcano

Reclus Volcano in Chile Appears to be Reawakening as Earthquakes Felt in Nearby Towns

Earthquakes Raise Alert Level at Alaska Volcano

Earthquake clusters detected at remote Aleutian volcano

Peru's El Misti Volcano is Active, Says IGP

Ecuador on Alert Over Spewing Tungurahua Volcano

Alert level raised on previously extinct Colombian Sotará volcano: an eruption would be first known in recorded history

Ecuador authorities issue warning as Tungurahua volcano spews ash, gas

Japan's Sakurajima volcano releasing largest amount of ash in 20 years: ground swollen around volcano

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