search

Jollyfant / PMAG2

Second iteration of paleomagnetism.org
https://paleomagnetism.org
Other
4 stars 1 forks source link

Magstrat suggestion #36

Open dpastorgalan opened 5 years ago

dpastorgalan commented 5 years ago

Maybe it is a good idea to add an inclination only statistics there (like inclination only "fold test") especially for people working in loong cores (IODP or ICDP) which turn when drilling so the only bedding information they have is the dip but not the strike.

This test maybe useful, as well and as a side effect, to compare sites with suspicions of vertical axis rotations (so a traditional fold-test may not work properly), if inclinations are much better after the correction, then you can suspect on local rotations (or in undetected structural problems, like plunging axes, shearing...)

Cheers!

dpastorgalan commented 4 years ago

Implementing this is going to be easier than thought. I was trying to translate that from pmagpy but I end up reading a paper (Maximum likelihood solution for inclination-only data) and found a much better method and what it is best, it is already in Javascript and opensource! There is a more complete FORTRAN code but the majority of it but the inclination only particularities are in pmag.org

This is the web: http://hergilsey.is/arason/paleomag/

Implementing inclination only foldtest from this stats shouldn't be hard (untilting the data in percentage and bootstrap only inclinations, since there is not a foll vector we should use the precision parameter as a marker).

dpastorgalan commented 3 years ago

I am adding suggestions to magstrat here:

1) VGP in the magstrat portal. Plotting VGP in addition to Inc and Dec is very helpful.

2) Forcing declinations to a common one. This is a common practice in magstrat: moving each collection average to the N or South to minimize the effect of rotations on the interpretation. I think it is should be simple to add to the Magstrat area.

3) And this is mine: I already suggested inclination only statistics. I have a python code that can do most of it right now. I am trying to make it as fancy as possible, but my skills are limited. However, with a little help it can be easily adapted to paleomagnetism.org.