Open Access

Three-dimensional inversion for Network-Magnetotelluric data

Earth, Planets and Space201456:BF03352536

https://doi.org/10.1186/BF03352536

Received: 27 May 2004

Accepted: 26 July 2004

Published: 24 June 2014

Abstract

Three-dimensional inversion of Network-Magnetotelluric (MT) data has been implemented. The program is based on a conventional 3-D MT inversion code (Siripunvaraporn et al., 2004), which is a data space variant of the OCCAM approach. In addition to modifications required for computing Network-MT responses and sensitivities, the program makes use of Massage Passing Interface (MPI) software, with allowing computations for each period to be run on separate CPU nodes. Here, we consider inversion of synthetic data generated from simple models consisting of a 1 Ω-m conductive block buried at varying depths in a 100 Ω-m background. We focus in particular on inversion of long period (320–40,960 seconds) data, because Network-MT data usually have high coherency in these period ranges. Even with only long period data the inversion recovers shallow and deep structures, as long as these are large enough to affect the data significantly. However, resolution of the inversion depends greatly on the geometry of the dipole network, the range of periods used, and the horizontal size of the conductive anomaly.

Key words

Network-Magnetotelluricdata space method3-D inversionOccam’s inversion