Yes – use Anomalous Magnetic Field = TMI – IGRF Assuming that the survey was flown using a fixed terrain clearance, your model will reflect all the geology - regional and local (down to the sampling resolution limitation).
Regards, Chris Chris Vaughan From: [email protected] [mailto:[email protected]] On Behalf Of SOLOMON YUSUF Sent: August-28-14 10:53 AM To: Geosoft Oasis montaj and Target Subject: RE: [Bulk] [geonet] TMI OR RESIDUAL Sir If I understand you well I should use the Total magnetic intensity data after removing the IGRF....to calculate my spectral analysis and gm-sys models... Solomon On 28 Aug 2014 15:46, "Chris Vaughan" <[email protected]> wrote: Then you’ll want to watch the wavelength cutoff of the regional you remove. If sufficiently long, your target’s spectral response should come out about the same. Regards, Chris Chris Vaughan President and Chief Geophysicist, CGI Controlled Geophysics Inc. From: [email protected] [mailto:[email protected]] On Behalf Of SOLOMON YUSUF Sent: August-28-14 10:16 AM To: Geosoft Oasis montaj and Target Subject: RE: [Bulk] [geonet] TMI OR RESIDUAL I mean residual= TMI-regional data And TMI= TMI when IGRF was calculated. Thank you Solomon On 28 Aug 2014 14:58, "Chris Vaughan" <[email protected]> wrote: If by residual magnetics, you mean removal of the IGRF, then yes, that would be better, especially on a regional scale. Regards, Chris Chris Vaughan President and Chief Geophysicist, CGI Controlled Geophysics Inc. From: [email protected] [mailto:[email protected]] On Behalf Of SOLOMON YUSUF Sent: August-28-14 9:25 AM To: Geosoft Oasis montaj and Target Subject: [Bulk] [geonet] TMI OR RESIDUAL Dr all, Please I will like know which is better 1. Use TMI for spectral analysis and modelling when studying a sedimentary basin for basin configuration and sedimentary thickness Or 2. Use residual data for the analysis above. Solomon N. Yusuf PhD student Mautech, Nigeria. --- Forum archives can be accessed here: http://lyris.geosoft.com/read/?fourm=geonet You are currently subscribed to geonet as: [email protected]. To subscribe or unsubscribe from any of our forums, select the User Forum selection on the Geosoft Community page: http://www.geosoft.com/support/community --- Forum archives can be accessed here: http://lyris.geosoft.com/read/?fourm=geonet You are currently subscribed to geonet as: [email protected]. To subscribe or unsubscribe from any of our forums, select the User Forum selection on the Geosoft Community page: http://www.geosoft.com/support/community --- Forum archives can be accessed here: http://lyris.geosoft.com/read/?fourm=geonet You are currently subscribed to geonet as: [email protected]. To subscribe or unsubscribe from any of our forums, select the User Forum selection on the Geosoft Community page: http://www.geosoft.com/support/community --- Forum archives can be accessed here: http://lyris.geosoft.com/read/?fourm=geonet You are currently subscribed to geonet as: [email protected]. To subscribe or unsubscribe from any of our forums, select the User Forum selection on the Geosoft Community page: http://www.geosoft.com/support/community --- Forum archives can be accessed here: http://lyris.geosoft.com/read/?fourm=geonet You are currently subscribed to geonet as: [email protected]. To subscribe or unsubscribe from any of our forums, select the User Forum selection on the Geosoft Community page: http://www.geosoft.com/support/community --- Forum archives can be accessed here: http://lyris.geosoft.com/read/?fourm=geonet You are currently subscribed to geonet as: [email protected]. To subscribe or unsubscribe from any of our forums, select the User Forum selection on the Geosoft Community page: http://www.geosoft.com/support/community
