please, see the attached HRTEM image:

1. how to settle for sure that the seemingly curved moire fringes are actually moire ?

2. which is the the procedure of measuring the parameters involved in the image formation of the curved moire fringes;

3. where could I find a text, on web, hopefully freely accessible, to learn about the involved mechanical stress on the ground of the HRTEM images posted herewith. Thank you.