Open AccessInterpretation of Long‐Period Magnetotelluric Soundings In Friuli (North‐East Italy) and the Electrical Characteristic of the Lithosphere
Author(s) -
Braitenberg C.,
Capuano P.,
Gasparini P.,
Zadro M.
Publication year - 1994
Publication title -
geophysical journal international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.302
H-Index - 168
eISSN - 1365-246X
pISSN - 0956-540X
DOI - 10.1111/j.1365-246x.1994.tb03312.x
Subject(s) - magnetotellurics , geology , lithosphere , crust , depth sounding , inversion (geology) , seismology , geophysics , mantle (geology) , electrical resistivity and conductivity , tectonics , electrical engineering , engineering , oceanography
SUMMARY One‐year‐long records of two magnetotelluric (MT) stations, located in the seismic Friuli region (north‐east Italy), were analysed in the 60‐28 800s period range. the aim was the investigation of the deep lithospheric electric structure. the computation of the impedances was made by an iterative signal‐to‐noise enhancing method. Impedances were analysed with complex singular value decomposition (SVD). Some tests were made trying to consider the distortion due to the shallow in‐homogeneities. 1‐D inversion of the apparent resistivity curves was carried out. the models obtained indicate that the lithosphere thickens from 90 to 120 km westward, in agreement with surface‐wave inversion. the westernmost sounding, located in an area of thickened crust, indicates the presence of a ∼10 km thick intracrustal conductor, which may be associated with incipient melting of lower crustal rocks.