N18 Graviton pulse, concussion, etc. : cumulative ?

Gperis

Juve
Feb 16, 2020
27
9
3
Versailles
Hi everyone !!

I wonder if graviton pulse, concussion, etc. are cumulative.
If an area is hit by a gravity template 2 times, is the movement reduced by 4 in this area ?
In the same idea, if a fighter is hit two times by a concussion weapon, is his Initiative reduced by 4, to the limit of 6+ ?
I checked both rules and FAQs and could kot find an answer...

Thank you for your help !!