Back in 2005, when a massive 35-mile-long rift broke open in the Ethiopia desert some geologists controversially claimed that a new ocean was forming as two parts of the African continent pulled apart.
Currently, scientists from several countries have supposedly confirmed that the volcanic processes at work beneath the Ethiopian rift are nearly identical to those at the bottom of the world's oceans, and the rift may likely be the beginning of a new sea.
Published in the latest issue of Geophysical Research Letters, the new study suggests that the highly active volcanic boundaries along the edges of tectonic ocean plates may suddenly break apart in large sections, instead of little by little as has been predominantly believed. In addition, such sudden large-scale events on land pose a much more serious hazard to populations living near the rift than would several smaller events, says Cindy Ebinger, professor of earth and environmental sciences at the University of Rochester and co-author of the study.
Atalay Ayele, professor at the Addis Ababa University in Ethiopia, led the investigation, painstakingly gathering seismic data surrounding the 2005 event that led to the giant rift opening more than 20 feet in width in just days. Along with the seismic information from Ethiopia, Ayele combined data from neighboring Eritrea and Yemen. The map he drew of when and where earthquakes happened in the region fit tremendously well with the more detailed analyses Ebinger has conducted in more recent years.
Ayele's reconstruction of events showed that the rift did not open in a series of small earthquakes over an extended period of time, but tore open along its entire 35-mile length in just days. A volcano called Dabbahu at the northern end of the rift erupted first, then magma
pushed up through the middle of the rift area and began "unzipping" the rift in both directions, says Ebinger.
"We know that seafloor ridges are created by a similar intrusion of magma into a rift, but we never knew that a huge length of the ridge could break open at once like this," says Ebinger. She explains that since the areas where the seafloor is spreading are almost always situated under miles of ocean, it's nearly impossible to monitor more than a small section of the ridge at once so there's no way for geologists to know how much of the ridge may break open and spread at any one time.
Ebinger and her colleagues are continuing to monitor the area in Ethiopia to learn more about how the magma system beneath the rift evolves as the rift continues to grow.
(2009), September 2005 mega-dike emplacement in the Manda-Harraro nascent oceanic rift (Afar depression), Geophys. Res. Lett., 36, L20306, doi:10.1029/2009GL039605.
- PHYSICAL SCIENCES
- EARTH SCIENCES
- LIFE SCIENCES
- SOCIAL SCIENCES
Subscribe to the newsletter
Stay in touch with the scientific world!
Know Science And Want To Write?
- Part I: Bee Deaths Mystery Solved? Neonicotinoids (Neonics) May Actually Help Bee Health
- The BPA Paradox – Too Many Studies?
- 3X Saturated Fat In The Diet Doesn't Increase It In Blood
- Eosinophilic Esophagitis: Genetic Clues Of Severe Food Allergy
- Is Religion A Consolation Worth Having?
- GMO Labels Are Good For The $105 Billion Organic Industry - But No One Else
- Interstellar Is A Dangerous Fantasy Of US Colonialism
- "Reality? What is reality if you use irrational arguments to justify man's cruelty toward..."
- "Always loved the Heels that showed of the instep (arches) ..."
- "By the way, I am a fan of your blog. It's one of the few places I can follow physics without getting..."
- "Hello Anon,you're entirely right, it's arbitrary and it does not provide protection against cases..."
- "Henry wrote:I would not put it that way. One does not say that a complex number is anything..."
- Gene in kidney may play role in high blood pressure
- Panel-based genetic diagnostic testing for inherited eye disease proves highly accurate
- Research finds tooth enamel fast-track in humans
- Good news for cocaine users: Caffeine counters cocaine's effects on women's estrus cycles
- Clipping proteins that package genes may limit abnormal cell growth in tumors