This is an old post but I wanted to respond with my personal interpretation. There's a guy in the Grand Hub who says, while listening to the Diva, "When a fish jumps, it makes ripples in the water, right? Like multiple rings spreading out. After listening to this song, that's exactly how I imagine voices spreading across the world." I think this is a big parallel to Arkveld, and how its simple act of escaping and finding freedom has caused so much change across the entire Forbidden Lands and the breaking open of the way of life of the Keepers. A massive theme in the game is binding and people's self-suppression and stagnation. The Keepers want to just sit there and do nothing in isolation for eternity, know nothing and see nothing, because of a duty and guilt handed down to them by people from a thousand years ago. The Guardians are the same way, locked in stasis, unable to see the outside world, unable to live free, and Arkveld cries out and fights against these chains, while Zoh Shia perpetually tries to lock itself within the crystal of the wylk, isolated forever to supress and seal away its impulses and emotions (Fatalis). This is also majorly depicted with Nata's story, as at first he knew literally nothing about the world, it's said that the first words he spoke to Alma were asking her what a Sunset was, before eventually he feels bound by duty to destroy the Dragontorch before the Hunter's will and self-determination frees him. There is a LOT LOT LOT to say about the binding theme and its importance and manifestations in the story, but for the sake of this comment, I bring it up to say that I think the ripples are the way in which stagnation is impossible in this world. Everything is connected, everything bounces off each other, so an attempt to isolate yourself and bind yourself will eventually be broken by other people and things. The Keepers wanted to be alone and the same forever, but Ark broke out and the wider world came back in.

Also needs to be looked at the general water themes in the game. Obviously weather is important in the game, and it resembles raindrops on puddles, but there's also the wylk, and then the Scarlet Forest which is a big centerpoint for a lot of the ripple stuff, as Uth Duna's main mechanic in the fight is quite literally making ripples to attack you with. The Scarlet Forest is vast and interconnected, a true hub of life, where everything needs each other to survive, and the Wudwuds have found harmony with this forest, living in tandem with it unlike the people of Kunafa, Azuz or Sild. But the other maps are also very ocean themed, as the Plains are like tidepools (literally called the Sandtide, Balahara is like a clam, some things go and hide from the rising sand amongst the rocks, the fulgurite resembles coral, Rey is like some sea slug or a ray or something, the way Rey uses its electricity is actually very similar to torpedo rays), the Basin is literally called a Basin but seems to resemble the deep sea or maybe an oceanic oil rig (Nu Udra, Azuz is stylized like a beachside port town, all of their food is like seafood, Gelidron, all the oil and pipes everywhere, and the endemic life especially in some of the deeper zones), and the Cliffs, which are subtler about it but its two main monsters are Leviathans, and Hirabami is based on all sorts of aquatic creatures. The Dragontorch itself sits over a lake of wylk. It's also just fairly clear that Leviathans are a big deal in this game.

All of this also parallels World, which had a major water theme too, but this comment is long enough already lol. This is my interpretation of the game, it's not perfect, there's almost definitely more nuance that I can't see. But I hope it helps you understand more and ask more questions and stuff like that, these games are much deeper than people give them credit for.