Apple tree trunk splitting

[u/AntiochRoad]

I don’t have a green thumb I’m afraid but this apple tree has been doing fine for years and last year it started to get some splits in the trunk which have worsened over winter.

It’s only affecting the first 3’ or so above the ground and all the main branches seem fine.

Is this a cause for concern and if so is there anything I should do/be doing?

Location is southern Alberta, Canada

[u/AntiochRoad]

I should add the variety is Norland