P. Kaikkonen

University of Oulu

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L. L. van'yan

Institute of Oceanology. PP Shirshov Russian Academy of Sciences

Shashi Prakash Sharma

Indian Institute of Technology Kharagpur

N. A. Palshin

Institute of Oceanology. PP Shirshov Russian Academy of Sciences

Kari Moisio

University of Oulu

Sven‐Erik Hjelt

University of Oulu

J. Tiikkainen

University of Oulu

Milan Hvožďara

Slovak Academy of Sciences

T. Korja

Luleå University of Technology

K. Pajunpää

Finnish Meteorological Institute

Annakaisa Korja

University of Helsinki

Cooperative Institutions

University of Oulu

Institute of Oceanology. PP Shirshov Russian Academy of Sciences

Uppsala University

Geological Survey of Finland

Russian Academy of Sciences

Luleå University of Technology

Hungarian Academy of Sciences

HUN-REN Institute of Earth Physics and Space Science

Institute of Terrestrial Magnetism Ionosphere and Radio Wave Propagation

Geological Survey of India

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2-D inversion of MT data with a variable model geometry

Geophysical Journal International (1992)

Álex Marcuello P. Kaikkonen J. Pous

An inversion algorithm which takes into account the varying geometry in magnetotelluric models is considered. The particular problem of estimating the shape of the interface between two different conductivities is studied. This boundary is represented by an implicit function and its parameters are calculated in the inversion process. The assumption of using such a function allows us to simplify the computation of the sensitivity matrix of the model, and gives a stronger numerical stability to the inversion procedure. The finite element method is used to solve the forward problem. The inversion algorithm is based on a Bayesian approach that allows the introduction of a priori information. Several examples with simple geometries show the possibilities offered by the algorithm.

Magnetotellurics

10.1111/j.1365-246x.1992.tb00875.x

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Citations (16)

Thin-sheet modelling for deep electromagnetic studies in the Fennoscandian Shield

Springer eBooks (2005)

P. Kaikkonen

10.1007/bfb0011919

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Citations (3)

The comparison of the experimental MT data with the results of numerical modelling for the Kamchatka Peninsula

Physics of The Earth and Planetary Interiors (1984)

P. Kaikkonen L. L. van'yan B.A. Okulessky A.M. Poray-Koshitz

Peninsula

10.1016/0031-9201(84)90064-5

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Citations (2)

A non-uniform thin sheet model for geomagnetic induction anomalies in central India

Physics of The Earth and Planetary Interiors (1993)

B. R. Arora P. Kaikkonen M. V. Mahashabde S. Y. Waghmare

10.1016/0031-9201(93)90131-r

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Citations (6)

Numerical electromagnetic modeling including studies of characteristic dimensions: A review

Surveys in Geophysics (1986)

P. Kaikkonen

Numerical models

10.1007/bf01904063

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Citations (15)

Contribution of the surficial effects on the low-frequency magnetotelluric anomaly at the Rheingraben area

Physics of The Earth and Planetary Interiors (1985)

P. Kaikkonen L. L. van'yan E.R. Martanus B.A. Okulessky

Magnetotellurics

Anomaly (physics)

10.1016/0031-9201(85)90009-3

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Citations (6)

Numerical modelling of deep dipole-dipole MHD sounding

Physics of The Earth and Planetary Interiors (1988)

P. Kaikkonen L. L. van'yan T. A. Demidova I. V. Yegorov N. A. Palshin

Distortion (music)

10.1016/0031-9201(88)90103-3

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Citations (9)

Local 1-D interpretation of magnetotelluric B-polarization impedances

Geophysical Journal International (1994)

Peter Weidelt P. Kaikkonen

SUMMARY It is shown that magnetotelluric impedances from the B-polarization (magnetic field in the strike direction of a 2-D resistivity structure) share a number of properties with 1-D impedances: all B-polarization impedances satisfy the same phase constraints as 1-D data, i.e. the impedance phase always lies between 0° and 90°. As a consequence the B-polarization impedances are minimum phase and thus allow conversions between apparent resistivity and phase. The constraints hold for an arbitrary 2-D topography of the air–earth interface. By examining the spectral function it is found that the B-polarization impedances for a number of models admit an exact 1-D interpretation. For two quarter-spaces this holds for all points and resistivity contrasts. The resulting 1-D model gives the correct resistivity down to a depth of half the distance to the interface. For the dyke model as the next complicated structure, 1-D interpretability requires that the host resistivity does not exceed the dyke resistivity by more than a factor of 60. B-polarization data of more complex structures investigated in this paper show either no, or only a marginal, violation of 1-D interpretability. A necessary condition constraining the frequency dependence of B-polarization and 1-D data in terms of their Mellin transform is derived in the final section.

Magnetotellurics

Inverse theory

Induced polarization

10.1111/j.1365-246x.1994.tb02466.x

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Citations (61)

Magnetotelluric and audiomagnetotelluric measurements in Finland

Tectonophysics (1982)

A. Ádám P. Kaikkonen Sven‐Erik Hjelt K. Pajunpää L. Szarka

Magnetotellurics

Distortion (music)

10.1016/0040-1951(82)90254-2

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Citations (38)

Audiomagnetotelluric measurements across the Lake Ladoga--Bothnian Bay zone in Central Finland

Geophysical Journal International (1984)

P. Kaikkonen K. Pajunpää

A group of 64 stations among 140 AMT measurement sites in Central Finland forms a profile about 220 km long. The profile starts from the Svecokarelidic orogenic belt (1800–1900 Ma) and traverses the Karelidic schist belt to the Presvecokarelidic basement (2600-2800 Ma).

Basement

10.1111/j.1365-246x.1984.tb01959.x

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Citations (19)