One idea would be, that quakes also creates land into the sea following this logic:
quake -> lava eruption under the sea -> cooling off and create some rocks -> rocks growing bigger from lava -> island is created
I think this could be nice to trigger some "over the time" events, so if you quake the sea, there won't happen anything soon, but more likely over time.
So first you only can see that the area of the sea is glowing or that bubbles flow to the surface, then some dark matter is appearing and spreading
and after a while you got there a land with gras biom or even sometimes a mountain with a lava pit.
This would add more value to the quake card, because now it's worthless once you got oil and lava.
Another idea of mine is, that sometimes in the mountain biom, there is created a small hole that you can "discover", so if you
already learned "pickaxe" and "hammer" (or anything else special), you discovered "mine" where you get stone and rarely even metal or iron.
Important here would be, that the villager after using the "Discovery" card won't craft down the stones around the hole so the biom won't
disappear again, or that the mountain biom around this hole stays there even without any rocks around it.