How does Earth Tremor work? is the aoe 10 feet as well?

Quote from Lyxen >>

I'm not sure what you mean, the whole spell is an AoE effecting all the ground within 10 feet of you, for both the creatures in there that must roll a save or take damage and become prone, and the ground that is made difficult terrain if it is loose earth and stone.

 that's exactly what I was unsure about, thank you! I didn't know if it was centered on you, or if it was like fireball.

I was reading some spells from Xanathar's Guide to Everything when I spotted Earth Tremor, and it has a strange combination of range and description.

RAW:

• Range: 10 feet
• Description: You cause a tremor in the ground within range. Each creature other than you in that area must make a Dexterity saving throw. [...]

It seems that previously the range and description was a little bit different according to this tweet and if you read this edition of the Elemental Evil Player's Companion:

• Range: Self (10-foot radius)
• Description: You cause a tremor in the ground in a 10-foot radius. Each creature other than you in that area must make a Dexterity saving throw [...]

Assuming then it's not a radius, even RAW, I see two interpretations if you're playing on a grid:

• You choose a point of origin and then the tremor is a 10 x 10 ft square (2x2 squares on a grid)
• Your character is the point of origin and then the tremor is a 25 x 25 ft square (5x5 squares on a grid). This could be sustained by the previous linked tweet:

and the next one:

If we draw the second interpretation, we'd have something like this where the caster is the green circle and the brown squares are the area of effect:

I need your opinion guys one more time!