Global crustal models for magnetic applications

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Presentation transcript:

Global crustal models for magnetic applications Wolfgang Szwillus1, Jörg Ebbing1 Foteini Vervelidou2 1 Institut für Geowissenschaften, CAU Kiel 2 GFZ, Potsdam

The induced crustal magnetic field Measured Total field = Core field + Induced Crustal field 580 °C Magnetite Induced Magnetization! Core field

The induced crustal magnetic field Affected by Crustal thickness Crustal composition (controls susceptibility) Crustal temperature (Mantle composition, Mantle temperature?) Challenges Overwhelmed by the core field in long wavelength Only short wavelengths of crustal/lithospheric magnetic field are known Relatively weak link to other geophysical observables

Magnetic data fit (magnetic crust) Forward calculation using tesseroids (Baykiev et al. 2017) Observed data (MF 7) @ 400 km height Moho depth from Crust1.0 Modelled data (Crust1.0) Susc = 0.035 SI

Magnetic data fit (variable susceptibility) Observed data MF 7 Susceptibility distribution from Hemant and Maus Modelled data (Variable susceptibility)

From thermal modeling to the magnetic field Heatflow Crustal thickness Lithosphere thickness Ocean floor age 1. Construct a global thermal model 2. Estimate Curie depth Assume Curie temperature of 580 °C (Magnetite) Susceptibility 3. Calculate magnetic field at satellite height Inducing field (IGRF 12)

Thickness of magnetic lithosphere Assume exponentially decaying heat production Characteristic depth 10 km Surface heat productivity 3.510 −6 W m 3 Positive values indicate (possibly) magnetic mantle Negative values indicate where the Curie isotherm lies within the crust Forward calculate magnetic field With and without mantle magnetization

Magnetic data fit (with thermal effect) Observed data MF 7 Modelled data with Curie depth from thermal model Constant susceptibility Crust = 0.035 SI

Spectrum All models lack signal power Hemant and Maus model (variable susceptibility) comes closest

Role of the mantle Extensive areas are cold enough to allow magnetization Additional sources in the mantle (i.e. mantle magnetization) helpful? Thickness of magnetic lithosphere Modelled magnetic field response of the cold mantle parts

Spectral view Small susceptibilities have no noticeable effect Extremely high mantle susceptibility 0.035 SI increases power level in SH degree 20-40

USGS database (GSC) Points in GSC database by year of data acquisition

Interpolation Use local universal kriging Interpolate on 1 degree grid Local linear trend estimation Separate oceanic and continental domains Interpolate on 1 degree grid Gives interpolated values estimated errors estimated error covariances

Moho depths from local kriging Estimated uncertainty

Impact of different crustal model on magnetic field By F. Vervelidou

The magnetic field in perspective Crustal composition Seismology Crustal thickness Gravity modelling Crustal induced magnetic field Thermal field Thermal modelling Employ magnetic field in multi-observable approach!