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SUMMARY:Chronicling Ethiopia’s explosive volcanic past using lake sedime
 nts - Dr Catherine Martin-Jones ( Department of Geography\, University of 
 Cambridge)
DTSTART:20180219T173000Z
DTEND:20180219T183000Z
UID:TALK100843@talks.cam.ac.uk
CONTACT:Charlie Eardley
DESCRIPTION:The volcanoes of the Ethiopian Rift Valley are some of the lea
 st studied on Earth. Of the sixty-five currently active volcanoes in the r
 egion\, forty-nine have no recorded historical eruptions. Accessing these 
 volcanoes can prove a logistical challenge\, and poor exposure at the volc
 ano may hinder investigation of past eruption frequency and magnitude. To 
 address this shortfall\, we study sediment cores from seven Ethiopian lake
 s and construct the region’s first Holocene record of volcanism. Volcani
 c ash (tephra) preserved in these stratigraphically-resolved lake sequence
 s catalogue explosive eruptions through time. Our first eruption record re
 veals that Ethiopian volcanoes have erupted frequently and explosively thr
 oughout the Holocene\, and therefore present a real\, previously underesti
 mated risk\, to the rapidly developing population. Lake sediment tephra re
 cords show significant potential for reconstructing past volcanism through
 out East Africa\, work essential to clarifying and reducing today’s volc
 anic hazards.
LOCATION: Harker 1\, Department of Earth Sciences\, Downing Street
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