IIRC it is something like 1300m lateral sep to allow "independent" operation.
Regarding when wake turb seperation comes into play.
Norwegian RFL-1 (our MATS pt.1)
Chapter 5, section 8.3.1, subsection b, part IV
"paralell runways, when the distance between the runway centerlines are less then 760 meter".
It does not come into force with VFR arrivals, it's "caution wake turbulence" only. Only IFR arrivals, and all departures are seperated wake wise.
It's not marked as deviating from ICAO standards.
It still sounds scary to routinely allow light AC traffic to a paralell so close operationg heavy traffic.
It does not really matter that much that the THR is so offset on RWY31.
Looks like it's max 250 meters between the 2 rwys on google maps.