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Towards a global interpretation of the Earth ’ s lithospheric magnetic field: Basin development, rheology, heat flux, tectonics, subduction, igneous processes, and impact. Michael Purucker. SGT at Planetary Geodynamics Lab, Goddard Space Flight Center/NASA, Greenbelt, USA.

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michael purucker

Towards a global interpretation of the Earth’s lithospheric magnetic field: Basin development, rheology, heat flux, tectonics, subduction, igneous processes, and impact

Michael Purucker

SGT at Planetary Geodynamics Lab, Goddard Space Flight Center/NASA, Greenbelt, USA

With thanks to a large cast: R. Blakely, S. Maus, V. Lesur, K. Whaler, T. Sabaka,, and MORE!!!

outline
Outline
  • Motivation. Objectives of Swarm, CHAMP. Previous work. What do we mean by interpretation?
  • The maps: MF, CHAOS, POMME, EMAG, WDMAM
  • The interpretation scheme: Basin development, rheology, heat flux, tectonics, subduction, igneous processes, and impact
  • 7 examples
  • How shall we approach the problem globally?
  • Earth’s magnetic field (2.3) at GFZ: Space and airborne missions, observatories, magnetic hazards program, lithospheric magnetic interpretation

Potsdam: 12 Dec 2011

swarm science objectives
Swarm science objectives

Potsdam: 12 Dec 2011

a satellite view
A satellite view

Maus et al., 2010

Potsdam: 12 Dec 2011

integrated satellite and ground view
Integrated satellite and ground view

WDMAM

Potsdam: 12 Dec 2011

basin development
Basin development

Siberia

Purucker and Whaler, 2006

Potsdam: 12 Dec 2011

rheology
Rheology

Purucker and Whaler, in preparation

Potsdam: 12 Dec 2011

heat flux
Heat flux

Purucker and Fox Maule, 2010

Potsdam: 12 Dec 2011

tectonics
Tectonics

MF-7

Potsdam: 12 Dec 2011

subduction 1
Subduction-1

Purucker and Clark, 2011

Potsdam: 12 Dec 2011

subduction 2
Subduction-2

Purucker and Clark, 2011

Potsdam: 12 Dec 2011

igneous processes
Igneous Processes

Western Australia

Purucker and Whaler, 2006

Potsdam: 12 Dec 2011

impact
Impact

Spray et al. 2004

Purucker and Whaler, 2006

Potsdam: 12 Dec 2011

a global approach to the problem
A global approach to the problem
  • From longest to shortest wavelength
  • Interpretation should include all lithospheric processes with magnetic field signatures.
  • A signature GFZ product, which would engage students, and leading geologists and geophysicists, including GFZ experts outside of geomagnetism.
  • Would provide academia, and the exploration geophysics community, with a powerful tool to facilitate testing of hypotheses relating to the earth’s crust and lithosphere.

Potsdam: 12 Dec 2011

earth s magnetic field 2 3 at gfz
Earth’s magnetic field (2.3) at GFZ
  • Space and airborne missions
    • CHAMP, Swarm, HALO, Swarm follow-on, UAVs
  • Observatories
    • Automated, virtual, remote sensing of mesospheric fields
  • Magnetic Hazards program
    • Space weather, Climate science, neutral wind and density and satellite altitude evolution, large earthquake localization, South Atlantic Anomaly evolution
  • Lithospheric magnetic interpretation and modeling
  • Core field modeling and interpretation

Potsdam: 12 Dec 2011

let swarm begin
Let Swarm begin!

Potsdam: 12 Dec 2011