Active volcanoes / Aktive vulkaner:
Nabro, Eritrea



The July 2011 eruption - in a really deserted area of the Globe.


The volcano is located on the edge of the Danakil Desert, a remote and sparsely populated area on the border between Eritrea and Ethiopia

The 2218-m-high Nabro stratovolcano is the highest volcano in the Danakil depression of northern Ethiopia and Eritrea
. Located at the SE end of the Danakil Alps, Nabro lies in the Danakil horst. Nabro is the most prominent and NE-most
of three volcanoes with large summit calderas aligned in a NE-SW direction SW of Dubbi volcano.

These three volcanoes, along with Sork Ale volcano, collectively comprise the Bidu volcanic complex.
The complex Nabro stratovolcano is truncated by nested calderas, 8 and 5 km in diameter. The larger caldera is widely
breached to the SW. Nabro was constructed primarily of trachytic lava flows and pyroclastics. Post-caldera rhyolitic
obsidian domes and basaltic lava flows were erupted inside the caldera and on its flanks.
Some recent lava flows were erupted from NNW-trending fissures transverse to the trend of the Nabro volcanic range.
GVN

September 28th, 2011


September 28, 2011

Satellite imagery suggests that the eruption of Nabro Volcano, which began in June 2011, continues. Orbiting instruments
such as the Advanced Land Imager (ALI) aboard Earth Observing-1 (EO-1), which acquired these images, may be the
only reliable way to monitor Nabro.

The images show the volcano in false-color on September 28, 2011. Heat from vents in Nabro’s central crater is visible
as a red glow in the false-color image. Another hotspot about 1,300 meters (4,600 feet) south of the vents reveals
an active lava flow. A pale halo surrounding the vents indicates the presence of a tenuous volcanic plume.
South of Nabro’s crater, the dark, nearly black areas are coated with ash so thick it completely covers the sparse
vegetation. On either side of this region is a thinner layer of ash with some bright green vegetation (exaggerated in false-
color) poking through.

After midnight local time on June 13, 2011, the Nabro Volcano in the Southern Red Sea Region of Eritrea erupted
after a series of earthquakes hit the Eritrea-Ethiopia border region, ranging up to magnitude 5.7. This is the first time
in recorded history that the Nabro Volcano has erupted, spewing ash and large amounts of sulfur dioxide into the
atmosphere, the highest levels ever detected from space, according to preliminary estimates from researchers at
NASA's Goddard Space Flight Center.

Uploaded on June 23rd, 2011, http://www.youtube.com/watch?v=T_q_w0_L4hY

Sometimes I wish I understood more languages. This video shows that this is absolutely not an uninhabited and
deserted area. So what is one going to believe?



Effects

On 16 June, the inhabitants of Afambo, Nebro and Sireru were evacuated.

By 19 June, ash had been deposited at least 60 km (37 mi) beyond the Ethiopian border to WNW–to–SWS.

By 20 June, eight villages in the Biddu district of Ethiopia were covered by volcanic ash, affecting at least
5,000 people and polluting springs and streams. One entire community has not been heard from.
Many community members, especially children, are sick and in desperate need of medical attention.
Vomiting and retching were reported as being common effects.

On 21 June, an Eritrean government statement reported seven people have been killed and three injured.
It was also reported that the Lake Afdera salt deposits now contain sulphuric acid, making the salt inedible.
Other reports says that salt-production resumed on June 27th.
Afdera's annual production capacity of salt is around 1.2 million tonnes.
Large salt producers monthly turn out more than 800tn, medium producers
mine between 300tn and 800tn, and the production of small-scale producers is less than 300tn.
There are 750 salt producers in Afdera.


Salt extracted from lake Afdera.
(Photo : http://static.panoramio.com/photos/original/50800839.jpg)

On 6 July, reports suggest 48,000 people in the Bidu, Afdera, Erebti, Elidar, Teru and Kori woredas were
in need of aid (with ash affecting food and water sources), and that the casualty total had reached 31 dead in the
Bidu woreda. See map below.

Another 167,153 people, in the Elidar and Kori woredas, were reported as requiring monitoring according to
the Afar regional government. However a spokesman for the Ethiopean Government Agriculture Ministry is reported to have said "We have looked at the document and I would like to make it clear that it is not a national document and that we have not endorsed it, the ministry has no record of casualties, it is still too early to say how many people had been affected and needed help."

mmm

June 13th, 2011
A number of flights in eastern Africa are facing disruption after a volcano erupted in Eritrea on early Monday morning.
It is the first eruption in recent history. . It sent a large plume of ash up to 13 kilometers (8 miles) high.

There were no immediate reports of casualties as a result of the eruption. Local residents have been evacuated.

VAAC forecaster Thoumieux said the ash cloud is moving towards the west and high concentrations of ash were spread
over parts of Eritrea, Ethiopia, Somalia, Djibouti, and Sudan by Monday evening. Low density concentrations of volcanic
ash were also detected over a small part of Egypt.
Partly from BNO News B.V.
. Since it began erupting on June 12, 2011, emissions from Eritrea’s Nabro Volcano have drifted over much of East Africa
and the Middle East. Ash has displaced residents living near the volcano and disrupted flights in the region. Despite the
volcano’s widespread effects, little is known about the eruption. Nabro is located in an isolated region along the border
between Eritrea and Ethiopia, and few English-language reports have been published. Satellite remote sensing is currently
the only reliable way to monitor the ongoing eruption.

This pair of satellite images are among the first detailed pictures of the erupting vent and lava flows.
They were acquired by the Advanced Land Imager (ALI) aboard the Earth Observing-1 (EO-1) satellite on June 24, 2011.


June 24, 2011

The natural-color image shows a close-up view of the volcanic plume and eruption site. A dark ash plume rises directly above the vent, and a short, inactive (cool) lava flow partially fills the crater to the north. A gas plume, rich in water and sulfur dioxide (which contributes a blue tint to the edges of the plume) obscures the upper reaches of the active lava flow. Black ash covers the landscape south and west of Nabro.


June 24, 2011 - False colour

The bright red portions of the false-color image indicate hot surfaces. Hot volcanic ash glows above the vent, located
in the center of Nabro’s caldera. To the west of the vent, portions of an active lava flow (particularly the front of the flow)
are also hot. The speckled pattern on upstream portions of the flow are likely due to the cool, hardened crust splitting and
exposing fluid lava as the flow advances. The bulbous blue-white cloud near the vent is likely composed largely of escaping
water vapor that condensed as the plume rose and cooled. The whispy, cyan clouds above the lava flow are evidence of
degassing from the lava.

More about the quake and the eruption to be found at EarthquakeReport.com
http://earthquake-report.com/2011/09/14/unusual-series-of-moderate-volcanic-earthquakes-in-eritrea-and-ethiopia/


Google
 
Web www.vulkaner.no




bukkm.gif
ANIMALS

over 250

birdm.jpg
BIRDS

over 500

flower.jpg
FLOWERS

over 225
dolphin.gif
SEALIFE
globe.gif
TRAVEL
globe.gif
VOLCANO


    alfabetisk liste
    alphabetic list



Free Counter

Denne siden er laget ved hjelp av Macromedia Dreamweaver