Fig. 7: Maps of phase tensor ellipses and induction arrows. | Communications Earth & Environment

Fig. 7: Maps of phase tensor ellipses and induction arrows.

From: 3D magnetotelluric imaging of a transcrustal magma system beneath the Campi Flegrei caldera, southern Italy

Fig. 7

Maps showing the Phase Tensor Polarization ellipses (columns a and b) and induction arrows (columns c and d) across various periods, highlighting both observed and predicted values. Columns A and C present the values derived from the field MT data, while columns B and D display those obtained from the synthetic response of the 3D resistivity model inverted using ModEM. Each row corresponds to a distinct period (1 s, 10 s, 100 s, and 1000 s), providing insights into the evolution of polarization and induction patterns with depth. The colors of the ellipses indicate the phase angle β (degrees), with the accompanying color scale shown on the right. Rose diagrams of the β angle are also reported. Induction arrows reflect the direction and strength of subsurface conductivity, with blue arrows representing real components and red arrows representing imaginary components, plotted using the Parkinson convention.

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