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SUMMARY:Tracking variations in volcano construction and lithospheric flexu
 re along the Hawaiian-Emperor Seamount Chain - Prof Robert A. Dunn (Univer
 sity of Hawaii)
DTSTART;VALUE=DATE-TIME:20221021T120000
DTEND;VALUE=DATE-TIME:20221021T130000
UID:https://talks.ox.ac.uk/talks/id/eef93e0a-44ca-44e7-944c-cebbd08a5cce/
DESCRIPTION:The Hawaiian-Emperor seamount chain is one the most prominent 
 examples of a volcanic chain on the surface of the Earth\, and has long be
 en considered a hotspot track generated by the motion of the Pacific plate
  over a deep mantle plume.  As individual volcanoes of the chain grow\, th
 ey apply a downward load on the seafloor and progressively deform the lith
 osphere. The resulting flexure is manifest in the deep bathymetric depress
 ion that flanks the volcanic chain.  A key aspect that impacts plate loadi
 ng and rheological models of the lithosphere is the distribution of materi
 al added to the crust by magmatic activity. Previous studies suggested a r
 ange of possibilities\, from volcanic construction being confined to the r
 egion above the oceanic crust\, to some new material added within the crus
 t\, to some material “underplated” to the bottom of the crust. To inve
 stigate these and other issues\, a set of marine geophysical field studies
  were carried out across the Emperor and Hawaiian Ridges.  Seismic images 
 from three lines that cross the volcanic chain reveal the amount of new ma
 terial added to the plate\, the internal structure of the volcanoes and un
 derlying lithosphere\, the thickness of erosional material in the surround
 ing moats\, and the shape and degree of flexure of the lithosphere. The da
 ta allow us to compare plate loading and flexure for a load emplaced at a 
 time when the plate was relatively young (Emperor Ridge) to a time when th
 e plate was relatively old (the Hawaiian Ridge) and will lead to better ag
 e-dependent loading and response models for oceanic lithosphere. \n\n\nSpe
 akers:\nProf Robert A. Dunn (University of Hawaii)
LOCATION:Department of Earth Sciences (Lecture Theatre)\, South Parks Road
  OX1 3AN
TZID:Europe/London
URL:https://talks.ox.ac.uk/talks/id/eef93e0a-44ca-44e7-944c-cebbd08a5cce/
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DESCRIPTION:Talk:Tracking variations in volcano construction and lithosphe
 ric flexure along the Hawaiian-Emperor Seamount Chain - Prof Robert A. Dun
 n (University of Hawaii)
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