Magnetotellurics

Magnetotelluric (MT) is a geophysical exploration method to probe the Earth´s deep interior for its electrical conductivity distribution. The MT set-up consists of long-period fluxgate magnetometers and non-polarizing electrodes to measure the electromagnetic field at the surface of the earth. Earth´s response to electromagnetic induction is given by the ratio of time varying horizontal magnetic and electric fields.

 

Within the framework of the Integrated Plate Boundary Observatory Chile MT is used to monitor and analyze electromagnetic data at seven observation sites to decipher possible changes in the subsurface resistivity structure, e.g. as a consequence of large scale fluid relocation associated with subduction zone related, dynamic processes. Already small amounts of brines (in interconnected veins) can suffice to significantly increase the bulk conductivity of a rock or an entire region of the subsurface. MT measurements are made at seven of the multi-parameter sites:

Code	Net	lat	lon	elev
PB01	CX	-21.04323	-69.48740	900
PB02	CX	-21.31973	-69.89603	1015
PB03	CX	-22.04764	-69.75327	1460
PB04	CX	-22.33350	-70.14939	1520
PB05	CX	-22.85274	-70.20232	1150
PB06	CX	-22.70583	-69.57173	1440
PB07	CX	-21.72660	-69.88612	1570

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