Focused time-lapse inversion of radio and audio magnetotelluric data

@article{Carbajal2012FocusedTI,
  title={Focused time-lapse inversion of radio and audio magnetotelluric data},
  author={Marina Rosas Carbajal and Niklas Linde and Thomas Kalscheuer},
  journal={Journal of Applied Geophysics},
  year={2012},
  volume={84},
  pages={29-38}
}

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References

SHOWING 1-10 OF 38 REFERENCES

Structural joint inversion of time‐lapse crosshole ERT and GPR traveltime data

Time‐lapse geophysical monitoring and inversion are valuable tools in hydrogeology for monitoring changes in the subsurface due to natural and forced (tracer) dynamics. However, the resulting models

Occam's inversion to generate smooth, two-dimensional models from magnetotelluric data

Magnetotelluric (MT) data are inverted for smooth 2-D models using an extension of the existing 1-D algorithm, Occam’s inversion. Since an MT data set consists of a finite number of imprecise data,

Difference Inversion of ERT Data: a Fast Inversion Method for 3-D In Situ Monitoring

A three-dimensional (3-D) Occam’s inversion algorithm for electrical resistivity tomography is modified to allow for inversion on the differences between the background and subsequent data sets. The

Characterization of a fractured granite using radio magnetotelluric (RMT) data

We applied tensor radio magnetotellurics (RMT) in the 10–250 kHz frequency range to study major fracture zones on Avro, a small island (1.6 × 1.2 km2) in southeastern Sweden with bedrock dominated by

Monitoring freshwater‐seawater interface dynamics with audiomagnetotelluric data

Saltwater intrusion is one of the main environmental concerns within coastal aquifers. In this study we test the audiomagnetotelluric (AMT) method as a technique that can detect changes in electrical

Sensitivity study of marine CSEM data for reservoir production monitoring

Using numerical and analytical modeling, we assess the feasibility of marine controlled-source electromagnetic (CSEM) data for monitoring the flooding front during water flooding of an oil reservoir.

An efficient data-subspace inversion method for 2-D magnetotelluric data

Here, a new and much simpler approach to regularized 2-D inversion of magnetotelluric data which uses cheaply computed approximations to the sensitivity matrix to search for a minimum of the penalty functional.

Improved hydrogeophysical characterization using joint inversion of cross‐hole electrical resistance and ground‐penetrating radar traveltime data

Appropriate regularizations of geophysical inverse problems and joint inversion of different data types improve geophysical models and increase their usefulness in hydrogeological studies. We have

Applied geophysical inversion

An inversion algorithm is constructed which, given an arbitrary starting model and the absence of any data, will produce a preconceived earth model and then introduces the observed data into the inversion to determine how the prior earth model is influenced by the supplementary geophysical data.

A feasibility study of land CSEM reservoir monitoring in a complex 3-D model

SUMMARY We carried out a series of numerical simulations in a complex 3-D resistivity model to investigate the feasibility of using controlled-source electromagnetics on land for monitoring