Manuscript of the article: Ádám A., Novák A., Prácser E., Szarka L., Wesztergom V., Indication of meta-anthracite by magnetotellurics in the Kőszeg-Rechnitz Penninic window: a test area. Acta Geodaetica et Geophysica, 2013, 48:(3) pp. 281-292., DOI:10.1007/s40328-013-0028-2 INDICATION OF META-ANTHRACITE BY MAGNETOTELLURICS IN THE KŐSZEG-RECHNITZ PENNINIC WINDOW: A TEST AREA Ádám A., Novák A., Prácser E., Szarka L., Wesztergom V. Geodetic and Geophysical Institute, Research Centre for Astronomy and Earth Sciences, Hungarian Academy of Sciences, Sopron Abstract One of the Penninic Nappes is the Kőszeg-Rechnitz (K-R) tectonic window at the Eastern end of the Eastern Alps. It has a complicated metamorphic history from the Jurassic time. The organic material of the Penninic Ocean was transformed to electrically conductive meta-anthracite. Its amount in the chalcophyllite is estimated by geochemists to 0.2 per cent. Taking this conducting structure as a test area pilot deep magnetotelluric (MT) soundings have been carried out and we determined  the structure of the conductivity anomaly due to 0.2 per cent meta anthracite in the K-R window and its surroundings  the different kinds of MT distortions as lateral (side) effect of the conductor appearing in the crust and mantle  the most probable depth of the conductive asthenosphere at the border of the Pannonian Basin (having extreme shallow asthenosphere). The obtained ~140 km depth is in correlation with value of the asthenospheric map based mainly on seismic data. Keywords: magnetotelluric sounding; meta-anthracite; graphite; conductivity anomaly; Kőszeg-Rechnitz tectonic window; 1D and 2D inversion INTRODUCTION Characteristic features of geophysical methods are usually studied in test areas, which are tectonically i.e. geometrically and mineralogically well known. For the magnetotelluric deep soundings the Kőszeg-Rechnitz window (K-R), a characteristic geological structure, could be a suitable test area. This graphitic (meta-anthracite) conductive body is situated at the Austrian-Hungarian border (Figure 1). Six MT deep soundings as pilot measurements (shortly mentioned among others in Ádám, et al. 2008) were carried out close to the present research area, in order to prepare a more detailed study. The main objectives of this pilot measurements were as follows:  to indicate the conductor and its lateral effect (side effect) compared with geological information,  to analyze the different kinds of MT distortions,  to determine those extreme MT sounding curves, which hold the deepest real information (e.g. indication of the asthenosphere), in correlation with the seismic investigation. GEOLOGY OF THE PENNINIC WINDOW The Penninic Nappes, which are overlain by thick stack Austro-Alpine Units, are exposed at the Eastern end of the Eastern Alps in the tectonic windows of the Kőszeg-Rechnitz and Eisenberg (and in two others windows). This Penninic window contains a reduced