PetRos EiKon Incorporated - Geophysics Software and Consulting
Sophisticated geophysics software for the practicing geoscientist
Since 1994


July 2022 - EMIGMA V10 and QCTool V5.0.0

Both software have been modified to address changes in the Windows 11 OS.

Details of QCTool upgrades may be found on the QCTool website

More than 2 years of development have gone into the upgrades in EMIGMA V10. These notes will cover some of the changes.

Our 3D gridded magnetic inversion has been augmented in several aspects. The application already was a multi-core, array processing application but has been upgraded to allow a larger set of data as well as a much larger number of cells in the inversion grids. The inversion now allows the import of the topography over and in the vicinity of the survey. This is critical not only for accurate depth determination but also to address features within the topography. We have also upgraded the ability to introduce known magnetic information either for surface sampling or borehole cores. We have also upgraded to allow the use of CAD models as starting models for the inversions. Joint inversions are now allowed. These can be multiple data components such as the TMI and one or more of its derivatives. Also, joint inversion of airborne and ground data is now provided.

In some instances, magnetic anomalies may conform to Poisson's relation and in which case, it may be interesting to joint invert your magnetic and gravity data. To address this situation, we have added another option to import as a starting model, your gravity model or inversion and vice versa in a gravity interpretation project. In this case, when using a gravity anomaly or grid as a starting model, the software will use Poisson's relation to accurately determine the relation between the density values and produce susceptibility values for the starting model. The reverse is done in the case of gravity interpretation.

EMIGMA has long offered the simulation of models for magnetic vector data. We have now released our 3D gridded inversion to provide 3D inversion of vector data. Vector data must normally be processed prior to inversion and these processing capabilities are now released in our latest version of QCTool(V5.0). First, the vector components must be organized so that they are in a consistent orientation. Now that most instruments have IMU capability, we can now rotate the vector data to a consistent grid orientation. Two choices for grid definition may be made by the user, either geographic north or a user defined grid azimuth. Additionally, QCTool now allows the calculation of the derivatives both of the TMI and of vector data if multiple sensors are present. These gradients must also be de-rotated prior to inversion.

Additionally, in our magnetic tools we have upgraded the magnetic compensation to allow several new capabilities. First, compensation may be done on either TMI or vector data and the compensation coefficients may be calculated using either standard vector data or IMU orientation data. Finally, we have made what we believe is a significant break-through in the sense that high altitude box data is no longer required. Relatively low altitude data such as at 200m can now be used for the compensation coefficients. These new features make the compensation processing of magnetic data for either drones or UAV very accurate and efficient.

Major upgrades have been made to handle multiple data sets primarily to deal with the issue of strong non-uniqueness of inloop inversion models and the dangers thus presented. To address the non-uniqueness and inaccuracies in depth determination from inloop data, we have provided multiple component inversion for some time. This includes horizontal as well as vertical data and the use of data at any position from the center of the loop such as out of loop data and data in the loop but not at the center. The new capabilities allow such configurations as ground and airborne data as well as data sets with different loop sizes and base frequencies. We have demonstrated that with the use of two loop sizes, two base frequencies and inloop and out-of-loop data that one can determine a unique 1D model with accurate depth and resistivity information if in the appropriate environment.

EMIGMA has had 3D visualization tools for many years in order to build forward models, examine CAD models and provide some forms of data examination. In recent years, we have provided in our visualization application, the means to examine, in detail, the user's inversion models. These tools allow the user to slice the inversion at various depths and across sections as well as examine inversion results in terms of inversion cell parameters. However, users have long found the application unstable when working with complex models and large inversion grids. Major advances have been accomplished to address these problems and provide significantly faster and more stable viewing.

EMIGMA's 3D resistivity forward modeling algorithms are arguably the most comprehensive, rapid and accurate available and these capabilities give us strong advantages when developing inversion algorithms. Resistivity forward and inverse algorithms are now available for both moving systems (dipole-dipole, pole-dipole, pole-pole, Xhole) and fixed source surveys. For fixed source, EMIGMA offers algorithms for ground as well as surface TX to borehole RX and borehole TX and surface RX.

Both the forward and inverse algorithms are integral equation approaches. This provides significant advantages for both accuracy and speed. With an IE technique, there is no need to extend the grids to "infinity" to meet boundary conditions. The boundary conditions are automatically met by the inclusion of the background layered model that hosts the forward and inverse grids. But this approach offers other helpful techniques when performing inversion. For example, once an anomalous area is identified, the inversion grid may be focused onto that area to delineate the structure.

EMIGMA's inversion algorithms in V10 have had a number of upgrades. One of the most important upgrades is the addition of a non-linear forward solver (LN). Electric, such as observed in resistivity surveys, is one of the strongest scattering phenomena observed in nature. Resistivity contrasts across boundaries can be orders of magnitude and this is reflected in electric field current scattering contrasts across the boundary but current bending and gathering is also an important and strong feature in resistivity data. It has long been shown that standard solvers for electric field scattering are not able to both represent the amplitude of the electric field contrasts nor force the current bending caused by current being divergent free and subsequently the interactions between cells. One initial objective of the EMIGMA project was to address these issues and we have solved many of these issues in our forward algorithms but we have now introduced some aspects of these solutions to the inversions. Additionally, the resistivity inversion has been upgraded accordingly: upgraded to handle larger problems in terms of the size of the inversion grids and the amount of data, upgraded to multi-processing and our new techniques to handle memory issues more efficiently, upgraded in the case of fixed transmitter surveys to handle multiple transmitters as well as multiple orientations of voltage measurements, upgraded to allow the inclusion of geological constraints and to allow both polyhedral and prism starting models.

3D CSEM/CSAMT inversion: upgrades include allowing more multiple transmitters, more data components (electric and magnetic data) and a larger frequency suite. Also, included is a non-linear forward component allowing resolution of more high contrast structures. Improvements have also been made to improve speed and stability as well as new starting model capabilities. In QCTool, we have upgraded to allow processing of raw data from full waveform time series to generate the impulse responses for the field data.

Important upgrades to gravity processing have been made in QCTool for the isostatic effect. This is a critical correction if topography corrections are required. Topographic corrections must be adjusted for the isostatic effect as over high elevation areas, topographic corrections remove too much of the field and over low areas or on the sea, topographic corrections add too much into the field. The isostatic correction offsets these excessive corrections. This is one reason why performing Bouguer corrections may not be the correct approach for you.

One way to deal with the uncertainty concerning whether to perform Bouguer(terrain) corrections is to introduce the terrain into the inversion problem. In this way, variations in density in the terrain may be considered and shallow anomalies in the terrain may be resolved. In EMIGMA's gravity inversion, the user may import a digital elevation model into the inversion process. In this way, targets in the topography may be studied but also depth to targets will be more accurate than if everything is leveled to the geoid.

Additionally, the gravity inversion has been upgraded to allow polyhedral starting models as well as prisms. This can be used to introduce contact surfaces if available from either drilling or seismic work. Geological information may be introduced into the inversion.

Fourier Processing
Deriving a frequency spectrum for full wave data via FFT techniques is limiting due to the requirement for the time series to be of length 2N. This is particularly true when trying to recover the phase of a spectral (frequency) element. We have discovered with some manufacturers that the phase estimations can be terribly inaccurate for some frequencies. We have developed processing tools in QCTool to allow the user to process full waveform data whether EM, CSEM or IP via DFT (Discrete Fourier Transform) techniques. Historically, although this approach is known to be more accurate, geophysicists have relied on FFT due to computation times. To address the computation time, we have made the DFT spectral analyses and filtering algorithms multi-core, multi-processing which now makes this approach practical on modern computers running Windows.

FFT techniques are also used for processing potential field data for such targets as derivatives, wavelength filtering, upward continuation, and reduction to the pole. We have implemented our DFT algorithms for such processing. This improves the feature resolution as the cell size for calculating the Fourier processes is now not limited. In particular, this removes crossline artifacts and their effects on the vertical derivatives and thus all types of Fourier processing.

Posted on 2022-07-25 12:51:28


Title Date Summary
July 2022 - EMIGMA V10 and QCTool V5.0.0 25 Jul 2022

Details of QCTool upgrades may be found on the QCTool website More than 2 years of development have gone into the upgrades in EMIGMA V10

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July 2020 News 8 Jul 2020

Many EM simulation, processing and filtering algorithms have been augmented in our EMIGMA geophysics software.

(full article)
March 2020 - EMIGMA V9.5.5 now available 11 Mar 2020

We are pleased to announce that a new version of our EMIGMA geophysics software has been released. It includes many additions to the inversion, simulation and visualization tools.

Oct 2019 - 3D Resistivity Inversion 15 Oct 2019

We have completed an extensive upgrade to the 3D resistivity inversion in our geophysics software to allow both surface to borehole and borehole to borehole data.

(full article)
June 2019 - QCTool new features 12 Jun 2019

Many new features have been recently added to our QCTool software that will aid in processing geophysics data.

(full article)
Jan 2019 - Magnetic Compensation 22 Apr 2019

We have released a new version of our aeromagnetic processing and magnetic compensation geophysics software. The new version is suitable for airborne, ground and marine surveys.

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Oct 2017– CSEM and V9.5 release 6 Oct 2017

We are pleased to announce the release of V9.5 of our geophysics software effective October 5, 2017. This past year, we have enabled the use of Land Based CSEM survey interpretation.

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Oct 2016 - Release of Version 9.1 25 Oct 2016

While there are many minor improvements and additions to this version of our geophysics software, we wish to touch on only IP modeling, TDEM inversion and the inversion viewer.

(full article)
July 2016 - Land Based CSEM 27 Jul 2016

Our geophysics software now supports land based CSEM including data processing, editing , plotting, gridding, modeling (synthetic data) and 1D and 3D inversion.

(full article)
June 2016 – Extensions to 1D TDEM inversion capabilities 21 Jun 2016

We have added a large number of new functionalities to our 1D TEM inversion tools including simultaneous inversion of data from different base frequencies

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May 2016 - New Simulation Capabilities 11 May 2016

Inductive Plate Algorithm - FAST!

We have implemented a new compiler and other engineering aspects. The result is up to 50 times increased speed of computation!

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CGG Airborne Systems 9 Jan 2016

Support for CGG 100% normalized step response data has been implemented and is released in today's updates.

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Holiday prices 15 Dec 2015

Holiday pricing is now available for some licenses until Jan 1,2016. See the prices page for details.

Oct 2015 – EMIGMA V9.0 release 27 Oct 2015

We are pleased to announce a dramatically new version of the EMIGMA geophysics software. Changes include upgrades to computation speeds and accuracy and network dongle capability.

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May 2015 - EMIGMA developments 14 May 2015

Some exciting features added to EMIGMA include new imports, better geophysical data and error handling, as well as powerful modeling, inversion and mapping.

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July 2014 - New EMIGMA Developments 25 Jul 2014

With the introduction of new ground FEM systems, we have upgraded our tools for the newer systems particularly PROMIS, DualEM and GEM2.

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July 2014 - Expansion of MT Tools 24 Jul 2014

Last year, we completed major upgrades to our MT licenses but the growing popularity for these products is encouraging further additions.

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April 2014 - New IP/Resistivity Developments 22 Jul 2014

This year, we have released major upgrades to our Resistivity and IP licenses. We believe that EMIGMA is now the most comprehensive software package for such data.

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Sept 2013 News 17 Sep 2013

We have worked on our geophysics software to make the user interfaces more user-friendly. There has also been a strong focus on data import capabilities.

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June 2012 News 22 Jun 2012

Our geophysics software tools have undergone quite a few developments in the area of processing and visualization of magnetotelluric and CSAMT data.

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March 2012 News 9 Mar 2012

We are excited to present to you some of the many new features have been added to our geophysics products including enhancements to EMIGMA's 3D inversion

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3D CAD Import/Exports 31 Oct 2011

We have augmented our geophysics software tools for interacting with 3D CAD applications.

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QCTool Version 2.3 released 27 Sep 2011

This new version of our software has been recompiled and optimized for Windows Vista and Windows 7 among other new features.

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Sept 2011 News 1 Sep 2011

Our EMIGMA geophysics software has had many improvements over the last several months including enhancements to tem and mag inversion as well as 3d resistivity modeling.

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July 2011 - New MMR tools and license 6 Jul 2011

New simulation algorithms have been developed in our geophysics software for ground and borehole MMR surveys. The MMR license also includes borehole DC magnetic geophysical modeling.

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EMIGMA 8.6 is now available 24 Jun 2011

Licensed users with an up to date maintenance may download the latest release of our geophysics software here.

March 2011 News 4 Mar 2011

There have been some notable additions to EMIGMA during the fall of 2010 and early winter 2011.

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EMIGMA V8.5 has been released 29 Jul 2010

We are pleased to announce the immediate release of version 8.5 of EMIGMA. EMIGMA users with a license currently under maintenance are eligible for a free upgrade to this latest version.

(full article)
What's new in EMIGMA 28 Jan 2010

Many new features were included in EMIGMA during the fall of 2009

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New features in EMIGMA and QCTool 8 Jul 2009

Many new capabilities have been added to our products including the support of additional import formats as well as enhanced simulation algorithms.

(full article)
Time Domain Inversion 6 Jul 2009

While EMIGMA has contained one-dimensional inversion for TEM for a few years now, we have recently released two significantly enhanced versions.

(full article)
Updated Demo Databases 17 Apr 2009

The demo databases available in the downloads area of this website have received some substantial modifications.

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New TDEM Demo Database 25 Mar 2009

A new demo database exclusively containing time domain data for ground and borehole surveys is available.

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QCTool Price Increase 5 Mar 2009

As of April 1, 2009, the price for QCTool will be $200 CAD.

Download GeoTutor IV 20 Feb 2009

GeoTutor IV is now available for download from our website.

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Magnetic Compensation Plug-In 16 Jan 2009

We now offer a plug-in for Geosoft Oasis to perform magnetic compensation on aeromagnetic data contained within your .gdb files.

(full article)
EMIGMA video now available 2 Dec 2008

A training video demonstrating the power of EMIGMA can now be downloaded for free from the Downloads section of our website.

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New Modeling Capabilities 10 Nov 2008

We now offer forward modeling capabilities for MTEM and CSEM as well as for airborne MT applications such as ZTEM.

(full article)
New terraTEM import and functionality added 26 Jun 2008

EMIGMA now has the ability to import data generated by the terraTEM instrument.

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GeoTutor IV is now available 11 Jun 2008

We are proud to announce the immediate release of GeoTutor IV. This new version introduces the ability to register online using a customized serial number in the same way as Petros Eikon's QCTool.

(full article)
EMIGMA V8.1 is now available 28 Apr 2008

We are happy to announce the immediate release of EMIGMA V8.1, which brings with it complete compatibility with Windows Vista as well as a number of new capabilities and improvements.

(full article)
Buy Our Software Online 11 Feb 2008

Recently added to our Price page is the ability to securely purchase various PetRos EiKon products online using PayPal.

(full article)
EMIGMA V8.1 Coming Soon 4 Feb 2008

We are very pleased to announce the upcoming release of EMIGMA 8.1 on March 31. This will be the first EMIGMA product to be compatible with Windows Vista.

(full article)
Improved TEM Inversion 3 Jan 2008

While EMIGMA has contained one-dimensional inversion for TEM for a few years now, we have recently released a dramatically enhanced version.

(full article)
TEM-FAST added to EMIGMA 7 Dec 2007

Petros Eikon has enhanced one of its flagship products with TEM-FAST electromagnetic geophysical data capabilities.

(full article)
PetRos EiKon Services 21 Nov 2007

We have many geophysical services that can conform to your needs. Our experience extends to data in the areas of electromagnetics, magnetics and gravity.

(full article)
QCTool V2.2 Now Available 9 Nov 2007

Visit our downloads area to obtain QCTool so you can experience this latest version first hand.

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EMIGMA V7.8 - New Features 20 Aug 2007

Now in its third major release, EMIGMA V7.8 has an unequaled array of functions and now provides virtually all of your processing, modeling and inversion requirements for EM, Magnetics, Gravity, IP and Resistivity

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New release of QCTool (August, 2007) 20 Aug 2007

New release of QCTool 2.1(August, 2007).

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EMIGMA Update 1 Aug 2007

Users with an active maintenance contract can now download a new EMIGMA update for July 27.

Purchase QCTool via PayPal 23 Jun 2006

You can now purchase a QCTool license online via PayPal. You can use either a credit card or, if you live in USA or Canada, your bank account.

PetrosSuite Teaching & Research Software 31 May 2006

PetrosSuite - a new Teaching & Research software bundle for Academics.

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New Data Processing and Interpretation Services 31 May 2006

New Interpretaton and Processing Services now available.

(full article)
Aeromagnetic Compensaton now available in QCTool 31 May 2006

Aeromagnetic Compensation now available in QCTool (May, 2006)

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Two New Technical Papers 30 May 2006

Dr. Cheng studies the 3D airborne TEM modeling capabilities of EMIGMA and other available programs. In the second by Prof. Duckworth, he discusses among other things comparisons between EMIGMA's modeling results and his own scale model results.

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Live Chat and Support 8 May 2006

You can now talk to us live during our work hours (9:30am-7:30pm EST/EDT). Feel free to ask us any questions you may have, but please be patient. It may take a while for...

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New release of EMIGMA V7.8 now available 30 May 2005

New release of EMIGMA V7.8 (December, 2005) now available

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(No title) 30 May 2005

Conductivity Depth Imaging now available in EMIGMA V7.8.

(No title) 30 May 2005

New Impulse to Step Processing now available in EMIGMA V7.8.

(No title) 30 May 2005

QCTool now available for Scintrex CG5.

(No title) 30 May 2005

Imports, Modelling, Inversion, CDI's available for VTEM and AeroTeM systems.

May 2002 News 1 May 2002

Introducing EMIGMA V7.5

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February 2001 News 1 Feb 2001

EMIGMA Version 7 Release

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July 2000 News 1 Jul 2000

EMIGMA V7.0 Ready for Beta Testing

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December 1998 News 1 Dec 1998

EMIGMA V6.2 at a Glance

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February 1998 News 1 Feb 1998

New EMIGMA V6.1 Release Now Available

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April 1997 News 1 Apr 1997

3D Data Representation and Multiple Plates Now Available

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September 1996 News 1 Sep 1996

Focus: Improved Induction

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February 1996 News 1 Feb 1996

Sneak Preview into EMIGMA Version 5

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August 1995 News 1 Aug 1995

3D Resistivity/IP Surveys With EMIGMA Version 4

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July 1995 News 1 Jul 1995

EMIGMA Version 3

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October 1994 News 1 Oct 1994

New EMIGMA Development

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August 1994 News 1 Aug 1994

VH Plate Development

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July 1994 News 1 Jul 1994

MITEC Project

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