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SUMMARY:Magmatism and Faulting in Continental Rifts - Juliet Biggs (Univer
 sity of Bristol) 
DTSTART:20260318T140000Z
DTEND:20260318T150000Z
UID:TALK243163@talks.cam.ac.uk
CONTACT:Adriano Gualandi
DESCRIPTION:The East African Rift System offers a unique opportunity to st
 udy the development of continental rifts\, from amagmatic basins in the so
 uth to nascent seafloor spreading in the north. The canonical model is tha
 t continental extension initially forms a network of short fault segments\
 , which gradually grow and link to form long border faults along pre-exist
 ing weak zones. As stretching continues\, the lithosphere–asthenosphere 
 boundary rises\, and the volume of decompression melting increases. Magmat
 ism and faulting become localised along magmatic segments within the basin
 . Ultimately\, extension is dominated by dyke intrusions into very thin cr
 ust\, resembling the processes of seafloor spreading. However\, in reality
 \, the continental lithosphere is highly heterogeneous\, producing a diver
 sity of tectonic and magmatic processes that do not always fit this simple
  story. In this talk\, I will demonstrate how satellite observations are p
 roviding a fresh perspective on tectonic and magmatic processes at a conti
 nental scale\, allowing us to target fieldwork to understand the active pr
 ocesses by which continental rifts form and the hazards they pose.  I wil
 l show how using high resolution Digital Elevation Models has allowed us t
 o map active fault scarps across the amagmatic Malawi Rift and what InSAR 
 observations have revealed about magmatic activity within the mature conti
 nental rifts of Kenya and Ethiopia. Finally\, I will discuss the crisis re
 sponse and ongoing scientific investigation into the 2024-2025 Fentale-Dof
 en seismic-tectonic crisis\, which was caused by the intrusion of a 50 km 
 long dyke and triggered the evacuation of 75\,000 people. 
LOCATION:Wolfson Lecture Theatre
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