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Dr. Mickus joined a team of scientists from the University of Texas at El Paso, Stanford University, University of Leicester, Leeds University, Addis Ababa University, the University of Edinburgh and the Ethiopian Geological Survey, and colleagues from throughout the United States and Europe to study the ongoing rifting processes in the Main Ethiopian Rift. EAGLE is major geophysical study to investigate how east Africa is splitting apart, especially the main Ethiopian Rift. The Ethiopian portion of the east African rift is especially important as it is the only location on Earth that involves the transition from purely continental rifting (e.g., Kenya) to purely oceanic rifting processes (Afar region, Red Sea and the Gulf of Aden). The present experiment will study the rifting processes from the center of the Ethiopian rift to the edge of the oceanic rifting in the Afar region.
The experiment was been divided into 3 phases, with phases 1 (started October, 2001) and 2 (started October, 2002) involving the continuous recording of earthquakes from global and local events using broadband seismometers in order to investigate the mantle and deeper crustal structures within and below the rift. These studies will be helpful in determining the lateral and vertical extent of the hot mantle zone and pockets of molten rocks within the active volcanic regions. Phase 3 which started in late December, 2003 and continued until the end of February, involved three main projects. The most important, expensive and time consuming was the active source seismic experiment. This experiment involved deploying seismic recorders at approximately an one kilometer spacing along two profiles (one along the axis of the rift, another perpendicular to the rift) and a 3-D array of recorders surrounding and amongst the Nazareth volcanic region. As a source for the seismic energy, 19 explosions in 100-200 foot drillholes were distributed within the region encompassing the survey. In addition, detailed gravity data were collected (by Mickus and Dr. Abera of the University of Addis Ababa) between Awash and Nazareth, and magnetotelluric data were collected along the cross profile that will aid in the interpretation of the seismic data.
A rough overview of the entire experiment and some of the sights we saw are shown on the following 6 pages.
(click on image to see larger version)
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Governors, Missouri State University URL: Page created and maintained by Kevin Mickus Last revised: March 31, 2010 . |