Alan thank you for the comments.
My point is that the term "Tilt Derivative" might be rather confusing for non geophysicists, since they might tend to think that it is a derivative, or a change of a parameter Y (e.g. Magnetic Induction B) in relation to parameter X (e.g., Depth Z or Time t), which is not. "Derivative Tilt" is certainly more appropriate. When I explain the useful parameter to the geoscientist who is not knowledgeable in potential techniques, I tell them that it is a sort of "amplitude equalizer" in order to enhance weaker and low frequency signals in order to see better in areas with thick cover, so that they understand. Generally, I personally prefer to use the term "Gradient" instead of "Derivative", for obvious reasons. But I understand that technical jargon is deeply rooted. Thanks On Wed, Oct 7, 2020 at 11:47 AM Alan Reid via SEGMIN < [email protected]> wrote: > Folks, > > There’s a clear enough definition in the paper by Verduzco et al in The > Meter Reader (TLE February 2004). I believe they coined the term, so their > definition should stand. TDR (Tilt Derivative) is effectively the tilt of > the derivatives, They also define the “TDR_THDR” which is the total > horizontal derivative of the TDR. I do not believe Verduzco et al were > trying to suggest that Tilt is a derivative. Its clearly not. > > Given that they defined and published the term, perhaps we should respect > that and not go off with our own names for this entity? Nor go off with > other definitions for the term? > > I confess that “Derivative Tilt” might have been a more descriptive name, > but it somehow doesn’t have much of a ring, does it? Anyway, its useful as > described. And I teach it and use it in that form. > > I do not have any conflict of interest to declare, here. > > Regards > > Alan Reid > > On 6 Oct 2020, at 18:40, S E Geoscience and Exploration via SEGMIN < > [email protected]> wrote: > > Thanks. > > I prefer to call it "Amplitude Equalizer", sort of. > > On Tue, Oct 6, 2020 at 1:35 PM Richard Smith via SEGMIN < > [email protected]> wrote: > >> Perhaps it is called tilt derivative as you have to calculate derivatives >> to calculate it, as in the "tilt of the derivatives". Personally, I >> prefer the term, "local phase" (Thurston and Smith, 1997), but I have a >> conflict of interest! >> >> Regards >> Richard Smith >> >> >> >> -----Original Message----- >> From: S E Geoscience and Exploration via SEGMIN <[email protected] >> > >> To: [email protected] >> Cc: S E Geoscience and Exploration < >> [email protected]> >> Sent: Tue, Oct 6, 2020 11:29 am >> Subject: [SEGMIN] Tilt is not a derivative >> >> Dear all, >> >> I am always so puzzled. Why do people call the Tilt in potential >> techniques a derivative? It is not. >> >> Regards >> >> -- >> *Sergio Espinosa, Ph.D., P.Geo* >> Director, Geophysics >> *S E G*eoscience & *Ex*ploration >> ----------------------- >> SEGMIN community mailing list service ([email protected]). >> Change your personal options here: >> https://lists.geosoft.com/mailman/options/segmin/geofizzics%40aol.com >> Colleagues can join here: >> https://lists.geosoft.com/mailman/listinfo/segmin >> Archives: https://lists.geosoft.com/mailman/private/segmin/ >> NOTE that <Reply> will reply to all members of the list. >> ----------------------- >> SEGMIN community mailing list service ([email protected]). >> Change your personal options here: >> https://lists.geosoft.com/mailman/options/segmin/se.geoscience.and.exploration%40gmail.com >> Colleagues can join here: >> https://lists.geosoft.com/mailman/listinfo/segmin >> Archives: https://lists.geosoft.com/mailman/private/segmin/ >> NOTE that <Reply> will reply to all members of the list. >> > > > -- > *Sergio Espinosa, Ph.D., P.Geo* > Director, Geophysics > *S E G*eoscience & *Ex*ploration > ----------------------- > SEGMIN community mailing list service ([email protected]). > Change your personal options here: > https://lists.geosoft.com/mailman/options/segmin/alan%40reid-geophys.co.uk > Colleagues can join here: > https://lists.geosoft.com/mailman/listinfo/segmin > Archives: https://lists.geosoft.com/mailman/private/segmin/ > NOTE that <Reply> will reply to all members of the list. > > > Alan B Reid PhD > Reid Geophysics Ltd > 7 Keymer House > Michel Grove > Eastbourne BN21 1JZ > UK > > Phone: +44 (0) 1323 735520 > Mobile: +44 (0) 781 692 4728 > Skype Name: alanbarryreid > mailto: [email protected] > web: http://www.reid-geophys.co.uk > > > ----------------------- > SEGMIN community mailing list service ([email protected]). > Change your personal options here: > https://lists.geosoft.com/mailman/options/segmin/se.geoscience.and.exploration%40gmail.com > Colleagues can join here: > https://lists.geosoft.com/mailman/listinfo/segmin > Archives: https://lists.geosoft.com/mailman/private/segmin/ > NOTE that <Reply> will reply to all members of the list. > -- *Sergio Espinosa, Ph.D., P.Geo* Director, Geophysics *S E G*eoscience & *Ex*ploration
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