91̽»¨

Electrical resistivity in the crust and mantle are a function of porosity and water content in the upper crust and temperature, melt fraction and chemical composition (i.e. hydration) in the mantle.

We use seafloor Magnetotellurics, a natural source electromagnetic method with a depth of penetration down to several hundred kilometers into the Earth, in order to image large scale tectonic features such as hot-spots, volcanic rifting or subduction zones. 

  Archimedes

  SPP 1375 Sample

  Alboran Sea

  SFB574

SO267

MSM17-1

MSM17-2

MSM24

Baba, K., Chen, J., Sommer, M., Utada, H., Geissler, W. H., Jokat, W. and Jegen, M (2017) Marine magnetotellurics imaged no distinct plume beneath the Tristan da Cunha hotspot in the southern Atlantic Ocean. Open Access Tectonophysics, 716 . pp. 52-63.

Bonadio, R., Geissler, W. H., Lebedev, S., Fullea, J., Ravenna, M., Celli, N. L., Jokat, W., Jegen, M. , Sens-Schönfelder, C. and Baba, K. (2018) Hot Upper Mantle Beneath the Tristan da Cunha Hotspot From Probabilistic Rayleigh-Wave Inversion and Petrological Modeling. Open Access Geochemistry, Geophysics, Geosystems, 19 . pp. 1412-1428.

Garcia, X., Seillé, H., Elsenbeck, J., Evans, R. L., Jegen, M. , Hölz, S., Ledo, J., Lovatini, A., Marti, A., Marcuello, A., Queralt, P., Ranero, C. R. and Ungarelli, C. (2015) Structure of the mantle beneath the Alboran basin from magnetotelluric soundings. Open Access Geochemistry, Geophysics, Geosystems, 16 . pp. 4261-4274.

Avdeeva, A., Avdeev, D. and Jegen, M. (2012) Detecting a salt dome overhang with magnetotellurics: 3D inversion methodology and synthetic model studies. Open Access Geophysics, 77 (4). E251-E263.

Brasse, H., Kapinos, G., Mütschard, L., Alvarado, G. E., Worzewski, T. and Jegen-Kulcsar, M. (2009) Deep electrical resistivity structure of northwestern Costa Rica . Open Access Geophysical Research Letters, 36 . L02310.

Avdeeva, A., Moorkamp, M., Avdeev, D., Jegen, M. and Miensopust, M. (2015) Three-dimensional inversion of magnetotelluric impedance tensor data and full distortion matrix. Open Access Geophysical Journal International, 202 (1). pp. 464-481.

Geissler, W. H., Jokat, W., Jegen, M. and Baba, K. (2017) Thickness of the oceanic crust, the lithosphere, and the mantle transition zone in the vicinity of the Tristan da Cunha hot spot estimated from ocean-bottom and ocean-island seismometer receiver functions. Open Access Tectonophysics, 716 . pp. 33-51.

Geissler, W. H., Wintersteller, P., Maia, M., Strack, A., Kammann, J., Eagles, G., Jegen, M., Schloemer, A. and Jokat, W. (2020) Seafloor evidence for pre-shield volcanism above the Tristan da Cunha mantle plume. Open Access Nature Communications, 11 (Art.Nr. 4543).

Jegen, M., Avdeeva, A., Berndt, C. , Franz, G., Heincke, B., Hölz, S., Neska, A., Marti, A., Planert, L., Chen, J., Kopp, H., Baba, K., Ritter, O., Weckmann, U., Meqbel, N. and Behrmann, J. (2016) 3-D Magnetotelluric Image of Offshore Magmatism at the Walvis Ridge and Rift Basin. Open Access Tectonophysics, 683 . pp. 98-108.

Jegen, M. , and Edwards, R. N. (1998) The Electrical Properties of a 2D Conductive Zone underneath the Juan de Fuca Ridge. Open Access Geophysical Research Letters, 25 (19). pp. 3647-3650.

Kapinos, G., Weckmann, U., Jegen-Kulcsar, M., Meqbel, N., Neska, A., Katjiuongua, T. T., Hölz, S. and Ritter, O. (2016) Electrical resistivity image of the South Atlantic continental margin derived from onshore and offshore magnetotelluric data. Open Access Geophysical Research Letters, 43 (1). pp. 154-160.

Neska, A., Nowozynski, K., Reda, J. and Jegen-Kulcsar, M. D.  (2013) Reducing motion noise in marine magnetotelluric measurements by means of tilt records. Open Access Geophysical Journal International, 194 (1). pp. 304-315.

Schlömer, A., Geissler, W. H., Jokat, W. and Jegen, M. (2017) Seismicity in the vicinity of the Tristan da Cunha hotspot: Particular plate tectonics and mantle plume presence. Open Access Journal of Geophysical Research: Solid Earth, 122 (12). pp. 10427-10439.

Schlömer, A., Geissler, W. H., Jokat, W. and Jegen, M. (2017) Hunting for the Tristan Mantle Plume - An upper mantle tomography around the volcanic island of Tristan da Cunha. Earth and Planetary Science Letters, 462 . pp. 122-131.

Worzewski, T., Jegen, M., Kopp, H., Brasse, H. and Taylor, W. T. (2011) Magnetotelluric image of the fluid cycle in the Costa Rican subduction zone. Nature Geoscience, 4 . pp. 108-111.

Worzewski, T., Jegen, M. and Swidinsky, A. (2012) Approximations for the 2-D coast effect on marine magnetotelluric data. Open Access Geophysical Journal International, 189 . pp. 357-368.