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

Earth, Planets and Space

Hisayoshi Shimizu¹  Denis Yakovlev²  Dmitrii Epishkin²  Nikita Zorin³  Sergey Zaytsev⁴  Dmitry Alekseev⁵ 

[1] Earthquake Research Institute, The University of Tokyo, 1-1-1, Yayoi, Bunkyo-ku, 113-0032, Tokyo, Japan;Nord-West Ltd, Business Centre Rumyantsevo, 1A, Office 412A, 108811, Moscow, Russia;Nord-West Ltd, Business Centre Rumyantsevo, 1A, Office 412A, 108811, Moscow, Russia;Earthquake Research Institute, The University of Tokyo, 1-1-1, Yayoi, Bunkyo-ku, 113-0032, Tokyo, Japan;Lomonosov Moscow State University, Faculty of Geology, Leninskiye Gory 1, 119991, Moscow, Russia;Nord-West Ltd, Business Centre Rumyantsevo, 1A, Office 412A, 108811, Moscow, Russia;Lomonosov Moscow State University, Faculty of Geology, Leninskiye Gory 1, 119991, Moscow, Russia;Engineering Center of Moscow Institute of Physics and Technology, Nauchnyy per., 4, 141700, Dolgoprudny, Moscow region, Russia;Shirshov Institute of Oceanology, Russian Academy of Sciences, Nakhimovskiy Prospekt, 36, 117997, Moscow, Russia;Moscow Institute of Physics and Technology, Institutskiy per, 9, 141701, Dolgoprudny, Moscow region, Russia;Schmidt Institute of Physics of the Earth, Russian Academy of Sciences, Bolshaya Gruzinskaya str., 10-1, 123242, Moscow, Russia;

关键词: Magnetotellurics;    Dispersion relations;    Causality;    Minimum phase;    Phase out of quadrant;   

DOI  :  10.1186/s40623-020-01273-4

来源: Springer

【 摘 要 】

The impedance tensor and tipper are shown to be non-causal in some classes of 2-D and 3-D magnetotelluric (MT) models, including those widely encountered off shore. At the same time, examination of a large database of onshore MT records yields only a handful of non-causal tensors, being non-causal due to the influence of nearby artificial conductors rather than some exotic geological conditions. This result implies that the actual chance to encounter a non-causal impedance tensor or tipper in terrestrial MT exploration is vanishingly small, thus securing the universal applicability of the dispersion relation technique for quality assessment of the mentioned transfer functions.

【 授权许可】

CC BY