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SUMMARY:The legacy of MEDUSA: Tracking fluids and earthquakes deep beneath
  western Greece - Stephane Rondenay
DTSTART:20200212T160000Z
DTEND:20200212T170000Z
UID:TALK137410@talks.cam.ac.uk
CONTACT:Jenny Jenkins
DESCRIPTION:What causes instraslab earthquakes in subduction zones?  The H
 ellenic subduction system provides a natural laboratory for exploring this
  question owing to its complex structure straddling two subduction regimes
 . I will discuss key results from data collected across western Greece\, p
 rimarily from the MEDUSA dense teleseismic array (2006-2009). This work ha
 s provided important new insight both into the subduction dynamics of the 
 Western Hellenic Subduction Zone and into fluid processes operating in sub
 duction zones globally. High-resolution seismic images show that subductio
 n in western Greece transitions from rapidly retreating oceanic slab subdu
 ction in the south to slow-converging continental slab subduction in the n
 orth. Intraslab seismicity stops exactly at the transition from oceanic to
  continental subduction\, pointing to fluids as playing a key role in the 
 generation of these earthquakes. Closer inspection of the earthquakes reve
 als the existence of localized seismicity clusters at the plate interface 
 and in the mantle wedge. These patterns of seismicity\, also detected in o
 ther subduction zones worldwide\, suggest that earthquakes in cold subduct
 ion zones track the migration of fluids from their source in the slab to t
 heir sink in the mantle wedge.
LOCATION:Marine/Wolfson Building lecture hall\, Bullard Labs.
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