Chris Moore

Chris Moore

Profile

I am a PhD student beginning in October 2016, and funded by the NERC Riftvolc project. I work with Sentinel-1 InSAR data to monitor and model volcanic activity in Afar, Ethiopia, where spreading-ridges analagous to mid-ocean ridges can be studied sub-aerially. I completed my undergraduate masters degree in July 2016, with a dissertation on modelling gravity data to study plate flexure, supervised by Greg Houseman.

Research interests

Project Summary:

Late-stage continental rifting in Afar, Ethiopia, provides the opportunity to observe magmatic spreading centres analogous to that of slow-spreading mid-ocean ridges. Simple thermal models developed at mid-ocean ridges, suggest that the depth of magma chambers is controlled primarily by spreading velocity and rates of magma supply. In such models, isolated, deep magma chambers underneath central volcanoes are found at slow-spreading ridges such as the Mid-Atlantic Ridge, and elongated, shallow axial magma chambers are only found at fast-spreading ridges such as the East Pacific Rise. However, recent observations from the subaerial spreading centre in Afar of a long-lived shallow axial magmatic system under the slow-spreading Erta Ale magmatic segment suggest that existing models may need revision. Here we use new Sentinel-1 InSAR observations of surface motions at volcanoes in Afar to test and constrain current models of magmatic systems at spreading centres.

The project aims to:

  • Make use of new and existing observations of deformation using the full 20 year archive of SAR data from ERS, Envisat, and Sentinel-1.
  • Determine the depths and geometries of magmatic systems using elastic models, along with complementary constraints acquired during the Afar Rift Consortium project from GNSS, seismicity, petrology, and magnetotellurics.
  • Examine how the depth of the magmatic systems in Afar varies with spreading velocity and rates of magmatic supply, and compare to other subaerial (Iceland) and submerged (mid-ocean ridges) spreading centres.
  • Test simple thermal models of magmatic systems at spreading centres, and develop them to account for a potential discordance between the model and observations at subaerial spreading centres.

This expands the existing reach of the RiftVolc project to the Afar region, which was the focus of the Afar Rift Consortium project, providing new constraints on magmatic systems that can be compared to those made in the Main Ethiopian Rift.

Current work:

Long-Term Extension and Magma Flux in the Build-Up to the January 2017 Eruption of Erta ’Ale Volcano, Northern Afar, Ethiopia. Moore et al., in prep.

 

Qualifications

  • MGeophys, BSc (First Class Hons), Geophysical Sciences (International), University of Leeds

Research groups and institutes

  • Institute of Geophysics and Tectonics
  • Volcanology