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Posts Tagged ‘Dabbahu fissure’

Arabia Shakes

Posted by feww on November 5, 2009

Arabian Plate Jolted by Quake Cluster at Boundaries in Gulf of Aden

As of posting 4 events had occurred in the region, the largest of which is estimated at 5.8 Mw. The events occurred at a depth of about 10 km.

A Wave of Intense Seismicity May Break up Arabian Plate!

In your lifetime you could see large earthquakes and volcanic explosions breaking up the Arabian plate,  creating  one or more islands from its southern half.

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Arabian Plate. Image Credit: Saudi Arabian Geological Survey

The western boundary of the Arabian plate is a transform fault zone — the Dead Sea and East Anatolian faults —where the adjacent plates grind past each other. Rifts of the Red Sea and Gulf of Aden constitute the southern boundary, where Arabia and Africa are pulling apart. The Zagros and Makran mountain ranges mark the present collision zone. Blocks north and east of the collision zone (the Lut and Helmand blocks) arrived on the shores of Eurasia much earlier and are being jostled about during the current event …  Tectonics of the Arabian Plate/ Johnson Space Center/NASA

FEWW Arabia Earthquake and Volcanic Activity Forecast

The GFZ Potsdam Earthquake Bulletin reported the events as follows

Event No. 1

Region: Western Gulf of Aden
Time: 2009-11-05 06:23:05.2 UTC
Magnitude: 4.4
Epicenter: 45.70°E 12.21°N
Depth: 10 km
Status: manually revised

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Earthquake Location Map. © Helmholtz-Zentrum Potsdam Deutsches GeoForschungsZentrum – GFZ

Event No. 2

Region: Western Gulf of Aden
Time: 2009-11-05 07:12:35.7 UTC
Magnitude: 5.6
Epicenter: 46.07°E 12.10°N
Depth: 20 km
Status: manually revised

Tectonics of the Arabian Plate

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The African, Arabian and Indian crustal plates have been marching northward to collide with Eurasia — for about 20 million years in the case of Arabia, and for 50 million years in the case of India. The result has been a collage of plate pieces and mountain ranges that extend from the Pyrenees in the west, across southern Europe and the Middle East, through the Himalayas and the ranges of southeast Asia. Incorporated within that broad band are continental fragments that moved across the ocean and separately crashed into Eurasia; structures of some of those fragments have been reactivated during the present collision. Image and Caption: Johnson Space Center/NASA

10-degree Map Centered at 10°N,45°E

EQ location Map USGS
Earthquake Location Map. Source: USGS/EHP. Enhanced by FEWW

Seismic Hazard Map

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Major Tectonic Boundaries: Subduction Zones -purple, Ridges -red and Transform Faults -green

Seismic Hazard Map

Event No. 3

Region: Western Gulf of Aden
Time: 2009-11-05 07:57:30.1 UTC
Magnitude: 4.8
Epicenter: 46.11°E 11.96°N
Depth: 10 km
Status: manually revised

Event No. 4

Region: Western Gulf of Aden
Time: 2009-11-05 08:05:52.6 UTC
Magnitude: 5.1
Epicenter: 45.95°E 12.13°N
Depth: 17 km
Status: manually revised

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Posted in earthquake forecast, feww earthquake forecast, seismic activity, seismic activity report, seismic event report | Tagged: , , , , , , , , , , , , , | 3 Comments »

Volcanic Explosions Could Split More Than Africa

Posted by feww on November 4, 2009

Volcanic Explosions and Large Earthquakes Could Splinter Several Continents, Countries

Large earthquakes and volcanic explosions could split Arabian Plate, North American Plate, Pacific Plate [in multiple places] and shatter Filipino Plate.


Erta Ale, an active shield volcano located in the Afar Region [northeastern] of Ethiopia in the Danakil Desert, is Ethiopia’s only active volcano.License: cc-by-sa-2.0. Credit: posted to Flickr by filippo_jean.

Erta Ale is part of the so-called Afar Triangle, a highly active volcanic region which includes Dabbahu Volcano, located in the remote Afar Region of Ethiopia. Dabbahu eruption in 2005 created a large fissure in the ground, called the Dabbahu fissure. The volcano is the hottest place on Earth’s  surface.

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Dabbahu Fissure. Image JPL/NASA.

Leading to Dabbahu’s only known eruption in recorded history, which formed a 500 meter long fissure and a 30 meter wide pumice cone at the fissure’s southern end, on September 26, 2005 the ground swelled as a cluster of more than 130 tremors shook the area near the volcano.

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Dabbahu Fissure, along the Somalian Plate, Great Rift Valley (Boina/Afar, Danakil desert, Ethiopia). A ground rupture created during the September 2005 rifting event. Photo: Tony Philpotts/ AP. Image may be subject to copyright.

Researchers say volcanic activity could split the African continent in two, a claim supported by a recent ground rupture that appeared in northeastern Ethiopia.

The 60-kilometre (35-mile) split in the desolate Afar region, which was the result of two volcanic eruptions in September 2005 [Dabbahu Episode, Afar,]  has enabled scientists to further examine the earth’s tectonic movements, said a report published in the Geophysical Research Letters.

“The significance of the finding is that a huge magnetic deformation can happen within a few days like in oceans,” Atalay Arefe, an Ethiopia-based university professor who was part of the study, told AFP in an interview.

Faults and fissures that normally occur on the ocean floor largely contribute to the continents breaking off  and moving away [spreading] from each other, in the same way African continent broke away from South American plate 100 million years ago.

“Normally, such phenomena happens beneath the ocean, which is inaccessible, expensive and very difficult to make experiments. But in Afar, it’s quite a natural laboratory for us to carry those out,” Atalay said.

Atalay, who was part of an international group of scientists who have been undertaking studies since the eruptions, said the event indicated what was likely to happen in the mainland.

“The ocean’s formation is happening slowly, likely to take a few million years. It will stretch from the Afar depression (straddling Ethiopia, Eritrea and Djibouti) down to Mozambique,” he said.

At 120 meter below sea level, Ethiopia’s Afar Depression is one of the lowest and hottest places on Earth, famous for its salt mines.

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Posted in Arabian Plate, filipino plate, Gulf of aden rift, large earthquakes, Nubian Plate, red sea drift, Somalian plate, Volcanic Explosions | Tagged: , , , , , , | 5 Comments »