I don't think it was meant as "they caused the sound". It seems more likely that such an advanced people wouldn't think a sound worth anything of significance, and in their hubris ignored it until it got out of hand. These were people who mostly let nature take it's natural course, as evident by one of the side stories; they probably didn't think a "minor" sound worth much thought.
I think they clearly gave it a lot of thought, really. They knew what it was doing and that it seemed to be inevitably destroying the world, and they prepared the entire sacrifice and Zodiark plan to stop it because they couldn't seem to find any other answers.