AlpArray Magnetotelluric

MT Group at the GFZ

12E swath meeting, 18. Juli , 11:00 - 17:00

• Three-dimensional electrical conductivity structure of the entire Alps using MT array data

• High-resolution electrical conductivity images of the Periadriactic Fault system (12E Swath)

Field Setups

Regional Scale

Field Setup:- ~ 160 sites, 40-50 km site spacing- Long period data recording time ~ 1 month.- Instruments National German Instrument Pool (GIPP-MT)

Collaboration:U. Cologne: B. Tezkan FU Berlin: H. BrasseU. Frankfurt: A. Junge U. Münster: M. BeckenU. Oulu: T. Korja U. Barcelona: J. Pous Czech A. Science: J. PekU. Leicester: M. Moorkamp ETH Zurich: A. Kuvshinov CNR – IGG: Adele Manzella

Total Cost: 660k€- Field experiment 150k€- 1 PostDoc (36 PM, TvÖD13) 225k€- 1 PhD (36 PM, TvÖD13, 75%) 169k€- 4 Student helper (36PM) 56k€- Travel 60k€.

Key points:Imaging lower crust uppermost mantle:- Transition from the western to

the eastern Alps.- Active and fossil fault

systems.- Provide boundary values for

further localized MT experiments.

Local Scale

http://www.geophysik.uni-muenchen.de/research/seismics/transalp

Total cost: 313k€- Field experiment 100k€- 1 PhD (36 PM, TvÖD13, 75%) 169k€- 1 Student helper (36PM, 40h/month) 14k€- Travel 30k€.

Personal:Mainly the GFZ MT working group

Key points:Imaging crustal structures including:- Shear zones: possible pathways for

mantle fluids,- active and fossil fault systems,- the boundary between the European and

Adriatic plates.- ~ 2 km km site spacing- Broad Band data recording time 3-4 days.- The duration of the field experiment: 6-8 weeks.

Thank You

CVA: Cascade volcanic arc; NBR: Northern Basin and Range; SRP: Snake River Plain; YS: Yellowstone; GFTZ: Great Falls Tectonic Zone; CB: Cheyenne Belt; CRP: Columbia River Plateau; MHB: Medicine Hat Block; CP: Colorado Plateau; VS: Vulcan Suture; BA1: Back arc upwelling. White dashed line represents the outline of Siletzia embayment as imaged by Humphreys (2008) and Gao et al. (2011)

USArray-MT

USArray-MT: Typical cross-section

Meqbel et al. (2013, in review)

Subduction systemActive zone

Cratonic stabile zone