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Table 2 The DR violation statistics for the impedance tensors from the onshore MT/BBMT database of Nord-West Ltd

From: Validity of the dispersion relations in magnetotellurics. Part II: synthetic and field data

Objects The amount of impedance tensors examined
Total number Anomalous Strongly anomalous Non-causal
Geotraverses 1-SB, 2-DV, 2-DVa, 3-DV, 8-DV, PU
(2001–2019, Russia)
7832 (100%) 703 (9.0%) 212 (2.7%) 5 (< 0.1%)
Taymyr Super Object
(2005–2019, Russia)
20,484 (100%) 61 (0.3%) 8 (< 0.1%) 0 (< 0.1%)
Other major objects
(2004–2019, Argentina, Bolivia, Brazil, Bulgaria, Colombia, India, Iran, Kazakhstan, Russia)
31,910 (100%) 273 (0.9%) 35 (0.1%) 1 (< 0.1%)
All together 60,226 (100%) 1037 (1.7%) 255 (0.4%) 6 (< 0.1%)