Dear GrvMag and SEGMin listers I’m addressing both lists because the matter concerns both…
Years ago, the late great Richard Hansen told me he’d proved that, for a conventional airborne magnetic total field survey, cross-line gradient measurements gave you the equivalent of halving the line spacing. The proof was for noise-free data, but hey, it's an indication of a usefulness that’s widely recognised and exploited. I subsequently asked Richard for his proof and he’d lost it, but he re-proved it another way. Regrettably, I’ve now also lost that proof. And Richard is no longer available to ask…… Hence the enquiry and the challenge. 1. Does anyone know of a published proof? If so, please may we have the reference (and even maybe a link to a pdf? 2. If not, does anyone have a proof they’d be prepared to offer for publication. I’d happily welcome it to “Geophysical Prospecting”, and I’m sure “Geophysics” and some other journals would be equally welcoming. 3. If neither of the above, the challenge is to produce a proof. It’d make a decent basis for an MSc, a pretty chapter in a PhD, and/or a worthwhile paper. From a personal perspective, it’d also “complete” the survey design criteria I published in 1980. Regards 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/archive%40mail-archive.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.
