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CSIRO Modules


The Australian CSIRO has been developing advanced EM modelling algorithms for approximately 25 years with the support of the mining industry through AMIRA International. EMIT provides the CSIRO interface as a single download, providing a friendly interface from which the suite of algorithms can be executed within Maxwell for forward and inverse modelling.

The Maxwell CSIRO interface is not part of the standard Maxwell functionality. Users are required to purchase a licence that enables them to interface the modules with Maxwell. All users who purchase the CSIRO interface are given access via their existing website login for convenience. Furthermore, EMIT actively maintains the suite of CSIRO applications, correcting errors and adding additional functionality in response to user feedback and requests. These improvements are made available for download to all CSIRO interface customers. CSIRO interface licences are only supported for dongle enabled Maxwell installations and are linked to a user's existing Maxwell dongle number. Please contact EMIT for more information and pricing.

Maxwell allows the user to define, display and edit model parameters through drag and drop mouse operation. Layered earth, thin-sheet, prism and mesh models can be built in Maxwell's 3-D visualisation environment.

 
  • Requires Maxwell version 5 or later
  • Ground system configurations tested include drill-hole, fixed, coincident and in-loop systems and MT
  • Airborne modules can model any frequency or time domain system. The transmitter is represented as a magnetic dipole for computational efficiency. Configurations tested include Geotem (dB/dt, B), VTEM, GTK/BGS wingtip, Tempest, Dighem, Spectrem, Aerotem and shipborne VCP broadside systems
  • All inversion routines are based on the damped SVD decomposition method (as per Grendl)
  • CSIRO module.txt files are provided which provide full details on the model parameters
CSIRO function matrix

 

Grendl

  • Layered earth forward and inverse modelling of DC apparent resistivity or ground TEM data, with square wave
  • Calculation of apparent resistivity
  • dB/dt or B field data
  • Limited to in-loop and coincident loop geometries

Beowulf

  • Layered earth for ground and borehole data
  • Inverse modelling
  • Frequency and time domain

Airbeo

  • Layered earth for airborne EM data
  • Forward and inverse modelling
  • Frequency and time domain

Leroi

  • Multiple thin plates in basement below multiple layers
  • Ground, underground and borehole data
  • Forward and inverse modelling of frequency and time-domain data
  • Loop, grounded dipole, magnetic dipole or plane wave source

LeroiAir

  • Multiple thin plates in basement below multiple layers for airborne systems
  • Frequency or time domain
  • Forward and inverse modelling
  • Plates confined to basement

Marco

  • 3D rectangular prisms within multiple layers
  • Forward model only
  • Ground or borehole systems
  • Ground or borehole systems
  • Much faster than Loki, more general than Leroi

MarcoAir

  • 3D rectangular prisms within multiple layers for airborne systems
  • Forward model only
  • Conductivity contrasts < 1:300
  • Much faster than Loki, more general than Leroi

Loki

  • 3D mesh/voxels based on compact finite edge elements with topography
  • Forward model only
  • Ground or borehole systems
  • Resistivity contrasts < 1:100,000

LokiAir

  • 3D mesh/voxels based on compact finite edge elements with topography for airborne systems
  • Forward model and inversion
  • Resistivity contrasts < 1:100,000

Samaya

  • General 3D local mesh within a uniform host
  • Forward model only
  • Full ground and downhole modelling
  • Loop source, grounded dipoles, MT

SamAir

  • 3D prism containing 3D mesh within a uniform host
  • Forward model and inversion
  • Faster runtime than Loki for multiple sources

Arjuna

  • General 2D mesh with 3D sources
  • Forward modelling only of inductive sources and receivers
  • Finite loops lie on the surface
  • Accurate even for very high contrasts
  • Includes topography
  • Use where targets are effectively 2D

ArjunAir

  • General 2D mesh with 3D sources for airborne systems (using a dipole source)
  • Forward and inverse modelling
  • Accurate even for very high contrasts
  • Includes topography
  • Use where targets are effectively 2D
  • Any AEM system in time or frequency domain
  • Faster runtime than LokiAir