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SUMMARY:Active Rifting in the East African Rift System and Challenges in D
 isaster Risk Management - Prof Atalay Ayele (University of Addis Ababa)
DTSTART;VALUE=DATE-TIME:20230616T120000
DTEND;VALUE=DATE-TIME:20230616T130000
UID:https://talks.ox.ac.uk/talks/id/56ae88bd-1b30-4f5a-b352-226cefcfa46d/
DESCRIPTION:The roughly 3000 km long East Africa Rift system (EARS) is one
  of the striking features of the African continent that captures all stage
 s of rift development from the most juvenile to nascent seafloor spreading
  in Okavango delta and Afar depression\, respectively. It provides a natur
 al laboratory for studying a fundamental\, and yet enigmatic\, component o
 f plate tectonics. A mechanism for rupturing thick\, cold\, continental li
 thosphere is not readily apparent in conventional models of mechanical str
 etching. Magma production weakens the plate and serve to localize strain\,
  thus better facilitating rifting. Studies of seismicity and volcanism pro
 vide insights into this problem and a variety of geophysical\, geochemical
  and geological studies can be used to better understand the role of the c
 rust and mantle in continental breakup. However\, observational data have 
 limitations in the global south both in quality and density which poses co
 nstraints for detailed investigation and understanding of the rift process
 .\n\nPermanent seismic station distribution is sparse in the continent but
  some focused and episodic  studies have been conducted using temporary br
 oad seismic networks in collaboration with overseas researchers. Earthquak
 es of magnitude 7.0 and above are observed in EARS from instrumentally rec
 orded seismicity (the 1910 Rukwa earthquake in Tanzania\, the 1990 earthqu
 ake in South Sudan and the 2006 Machase earthquake in Mozambique) which is
  a wakeup call for the fast growing construction industry in the region. I
 t is inferred that the EARS is more active than we think\, from recently r
 ecorded seismicity\, which requires collaborative efforts to enhance studi
 es in the region both to enhance basic science research and disaster risk 
 management in the continent.\nSpeakers:\nProf Atalay Ayele (University of 
 Addis Ababa)
LOCATION:Department of Earth Sciences (Lecture Theatre)\, South Parks Road
  OX1 3AN
TZID:Europe/London
URL:https://talks.ox.ac.uk/talks/id/56ae88bd-1b30-4f5a-b352-226cefcfa46d/
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DESCRIPTION:Talk:Active Rifting in the East African Rift System and Challe
 nges in Disaster Risk Management - Prof Atalay Ayele (University of Addis 
 Ababa)
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