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Posts Tagged ‘Nabro Volcano’

Nabro Volcano’s Pre-eruption Photo

Posted by feww on June 20, 2011

Nabro: A closer look at a neglected volcano

Nabro volcano erupted on June 12, 2011 apparently for the first time in recorded history.

The volcano is located in Eritrea and forms a larger complex with the Mallahle caldera to the southwest.

The following photo, taken by astronauts (cosmonauts?) aboard the ISS, show the large horseshoe-shaped caldera extending 8 kilometers (5 miles) in diameter. The opening to the southwest seems to have formed as a result of a major lateral collapse. Two infant calderas sit within the main basin.

The volcano was still erupting, though less vigorously, according to Toulouse VAAC,  as of posting.

Nabro Volcano photo taken from ISS on January 30, 2011. Astronaut photograph ISS026-E-23526. Nabro has spewed large amounts of SO2, reportedly the highest levels ever detected from space, according to preliminary estimates from NASA/GFSC. Source: NASA-EO. Click image to enlarge.

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Nabro Volcano Eruption – Satellite Images

Posted by feww on June 16, 2011

FIRE-EARTH Volcano Forecast: Major volcanic eruption may occur in Iceland this summer with a probability of 0.7 [P= 72%]

Nabro’s SO2 Rich Plume Rising to a Height of 11 km

Thick, fluffy white volcanic plume spewing from Nabro volcano is mainly composed of sulfur dioxide gas (and steam), according to Toulouse VAAC, Meteo France.

Their analysis is confirmed by the modeled ash concentration charts released by the agency (see below forFL200 – FL350 chart).

Ongoing eruption at Nabro Volcano located along the Eritrea and Ethiopia border. This photo-like image was captured by MODIS aboard the Aqua satellite on June 15, 2011. Source: NASA-EO. Click image to enlarge.  Download largest image (1 MB, JPEG)

Volcanic Ash Advisory

Volcanic cloud spewed by Nabro is said to contain mainly SO2. Source: Meteo France. Click image to enlarge.

Nabro volcanic ash cloud concentration chart for FL200 – FL350 (~ 6 to 11km alt.) Source: Toulouse VAAC/Meteo France 

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NABRO Volcano Ash Charts

Posted by feww on June 14, 2011

NABRO Eruption: Modeled Ash Concentration Charts

Surface to FL200 Chart [ground to about 6km altitude]

FL200-FL350 Chart [~ 6 to 11km altitude]

FL350-FL550 Chart [~ 11 to 17 km altitude]

Source: Meteo France – Toulouse VAAC. Click images to enlarge.

Volcanic Ash Advisory

See inset for Date/time details.

Copyright Eumetsat 2011


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Afar Triangle Volcano Erupts as Forecast

Posted by feww on June 14, 2011

Correction: Nabro Volcano in Eritrea Erupts Ejecting a 15-km Plume of Ash into the Atmosphere

Following a swarm of Earthquakes that struck within the Afar Triangle Eritrea, Ethiopia, yesterday, FIRE-EARTH said:

… there’s a strong probability that the quakes may have primed one or more regional volcanoes for eruption.

Nabro Volcano erupted around midnight Sunday local time, ejecting  a 15-km plume of ash into the air, reports said.

The volcano, which is located about 375 km southeast of the Eritrean capital Asmara, sits within the Afar Triangle, a tectonic triple junction.

Nabro volcano, Eritrea, sits close to the border with Ethiopia.  Credit: ESA/NASA.  Click image to enlarge.

Nabro eruption is captured in this photo-like image by  MODIS on the Aqua satellite on June 13, 2011. “Initial reports from news agencies and the Volcanic Ash Advisory Center in Toulouse, France, proclaimed the eruption to be occurring at Dubbi, a volcano further south. But later reports from volcanologists, field scientists, and the satellite image above appear to confirm the eruption at Nabro. There are no historical reports of eruptions at Nabro before today.” Image and caption: NASA-EO. Click image to enlarge. Download largest image (4 MB, JPG)

The fact that there was no historic record of eruption at Nabro volcano may explain why the French VAAC got it wrong initially, attributing the eruption to the Dubbi volcano – EDRO

Nabro Volcano
Country: Eritrea
Region: Northeastern Africa
Previous Known Eruption: NOT KNOWN
Summit Elevation: 2,218 m (7,277 ft)
Coordinates : 13.37°N, 41.70°E
Source: GVP

Nabro Volcano Space Shuttle image

The large caldera below and to the left of the center of this Space Shuttle photo of the Danakil Alps of Ethiopia is Nabro. The 2218-m-high Nabro stratovolcano is the highest volcano in the Danakil depression and is truncated by nested calderas 10 and 5 km in diameter. The larger caldera is widely breached to the SW. Nabro was constructed primarily of rhyolitic lava flows and pyroclastics. The 8-km-wide Mallahle caldera is at the lower left, and the dark-colored lava flows at the right are from Dubbi volcano. NASA Space Shuttle image S-61A-36, 1985. Caption: GVP

Nabro (top) and  Mallahle (bottom) volcanic calderas. This false-color topographical image of the two volcanoes was produced by NASA. Click image to enlarge.

Map of East Africa showing some of the historically active volcanoes (red triangles) and the Afar Triangle (shaded, center)— a so-called triple junction (or triple point), where three plates are pulling away from one another: the Arabian Plate, and the two parts of the African Plate (the Nubian and the Somalian) splitting along the East African Rift Zone. Source: USGS

A map showing the approximate location of Nabro and Dubbi Volcanoes. The yellow circles mark the epicenters of the recent quakes that struck the area. Red stars are the two largest shocks in the swarm measuring 5.7Mw. Click image to enlarge.

The huge ash cloud ejected by the volcano is said to be moving across the Horn of Africa, threatening air travel. The German airline Lufthansa said on Monday it had cancelled two flights, one a flight out of the Eritrean capital Asmara, and the other into Addis Ababa.

The ash plume also forced the U.S. Secretary of State Hillary Clinton to curtail her visit to the region. Ironically, Obama was forced to abandon his visit to Ireland when Iceland’s Grímsvötn volcano erupted last month.

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Updated on June 14, 2011 at 07:58UTC by EDRO
Updated on June 14, 2011 @ 12:01UTC by FEWW

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