Sea level change with the return of Atlantis.

[SittingBull]

Why is it, to me at least, that only easter north america, eastern canada, and north eastern south america lost massive shore line with the return of Atlantis. I always thought that if Atlantis were to return wouldnt sea level 'across the entire planet' go up, not just the oceans around Atlantis. Input?

Thank you.

[Icefalcon]

The sea floor could have dropped in other areas.

[SittingBull]

They did go up across the world. Portions of australia are underwater and so are Japan if memory serves.

True...

[SittingBull]

The sea floor could have dropped in other areas.

Now THIS I had not thought of also.

[Hotrod]

It's not just the sea level rise. Atlantis didn't come up slowly. There was a gigantic tidal wave, or tsunami. That much water would have caused massive destruction to the landscape, and erosion would have sucked away a lot of land mass, both initially and for several years afterwards (I'm presuming that it took the local fauna a long time to move back in and take root enough to stop erosion).

These effects would be more pronounced in places without any barriers between them Atlantis, the source of the massive tsunami.

That's my theory, anyway.

[eliakon]

It also didnt have to DISPLACE anything....if the water that took up the same space was simply displaced dimensionally, there would be no change at all.....

[Ectoplasmic Bidet]

So many things could have happened with the return of Atlantis, geologically as well as mystically, it's futile to second guess what's described in the books.

[SittingBull]

All good points.

[keir451]

The effects of Atlantis' return would have been felt most acutely along the American Eastern seaboard as well as the Western Coast of Europe and Africa with the effects dissapating the further out from the point of origin they got. Nonetheless, you are right there would have been an oincrease in the sea levels around the world, we see some of the effects in South America as well. On the Western coast of the US some areas (like norther California) are protected by steep cliff faces that the change in sea levels would appreciably affect and during the ensuing yearsof chaos nobody really notice the changes that DID occur so that by the time of the Coalition you'd wind up with people saying "It's always been that way since my greatgrand pappy's time."

[SittingBull]

Just messed with my head at first but now I see the major changes were done by the explosive return of Atlantis.

[Tor]

It also didnt have to DISPLACE anything....if the water that took up the same space was simply displaced dimensionally, there would be no change at all.....

True, but we know that it did, and there's no mention of the water going to another dimension...

Unless we count a certain Aussie.

Give it a couple decades and nobody will be complaining about high sea levels.

[Mech-Viper Prime]

Depends if the water is dimensionally displaced or physically displace then add in the rifts underwater , how much of this factor in?

[Subjugator]

It also didnt have to DISPLACE anything....if the water that took up the same space was simply displaced dimensionally, there would be no change at all.....

True, but we know that it did, and there's no mention of the water going to another dimension...

Unless we count a certain Aussie.

Give it a couple decades and nobody will be complaining about high sea levels.

I don't think he's referring to it going to another dimension. I think he's referring to the water occupying the space freed up by the land rising. Unless the entire continent rifted in (which is possible), it didn't pop out of thin air. The mass would've come from somewhere. I presume his hypothesis is that it was from the bottom of the ocean, and therefore offsets the localized rising land mass by land mass lowering elsewhere.

/Sub

[SittingBull]

It also didnt have to DISPLACE anything....if the water that took up the same space was simply displaced dimensionally, there would be no change at all.....

True, but we know that it did, and there's no mention of the water going to another dimension...

Unless we count a certain Aussie.

Give it a couple decades and nobody will be complaining about high sea levels.

I don't think he's referring to it going to another dimension. I think he's referring to the water occupying the space freed up by the land rising. Unless the entire continent rifted in (which is possible), it didn't pop out of thin air. The mass would've come from somewhere. I presume his hypothesis is that it was from the bottom of the ocean, and therefore offsets the localized rising land mass by land mass lowering elsewhere.

/Sub

That would be a hoot of a house rule. "Atlantis didnt emerge from another dimension, it rose from the ocean floor." I know impractical but what would the coast lines look like instead?

[eliakon]

What I am saying is this.
Atlantis left and went someplace check.
It then later came back from that someplace again check
What happened to the water that was in the space that Atlantis wanted to occupy when it came back? not check. We dont know if it was displaced physically causing oceans to rise, or dimensionally or a combination of both. The books dont exactly go into great detail, and its not that important, we can say "The oceans rose thus far and no further." and not have to worry if the cubic footage of water is equivilant to that of Atlantis or not, it doesnt matter. Just like it doesnt matter if the oceans fell when atlantis vanished or not.

[Subjugator]

I may have missed something, but Atlantis was rifted away, then rifted back after the Cataclysm. Since it vanished and reappeared, it would have displaced ocean water, equal to it's area.

I'm just describing what I think was meant.

/Sub

[Qev]

Oh god here I come with physics again.

Anyway if a continent the size of Atlantis popped into the ocean, displacing its total volume of water outward, there might not actually be much left of North America (edit: or Europe, or Africa, or the Mediterranean) other than bedrock. Such an event would generate 'megatsunami', which put earthquake-generated waves to shame; imagine a tsunami that starts out with a height measured in thousands of meters and travels at supersonic speeds, one which - as the shallower water near land causes it to bunch up - gets even taller and faster.

There's no known megatsunami event of this scale in the geologic record, so I can't really guess what it would actually do to the Atlantic continents. The Chicxulub asteroid impact that contributed to the extinction of the dinosaurs is thought to have generated a 3km tall initial wave, but even with its enormous kinetic energy, it would've been small potatoes compared to the amount of water a suddenly-appearing Atlantis would have to shove aside.

As an aside, things might be kind of grim for anyone in/bordering the Pacific, someday. Landslides on the Hawaiian islands have generated megatsunami in the past, and probably will again. There's some worry about the Canary Islands in the Atlantic, as well.

Sweet dreams.

[Mech-Viper Prime]

It's palladium science, so yeah it makes no sense, much like the actions of various forces on rifts earth.

[SittingBull]

The Dimensional Phasing?

[Icefalcon]

D-Shifting is what they call it.

[SittingBull]

Thank you. ^^

[Icefalcon]

That's because in the case of D-shifting, it's an anomaly that doesn't actually teleport an object to earth, but kind of temporarily teleports people to another dimension, even though they're still on rifts earth.

Enter: Paradox

It's not supposed to make sense.

[SAMASzero]

It's not just the sea level rise. Atlantis didn't come up slowly. There was a gigantic tidal wave, or tsunami. That much water would have caused massive destruction to the landscape, and erosion would have sucked away a lot of land mass, both initially and for several years afterwards (I'm presuming that it took the local fauna a long time to move back in and take root enough to stop erosion).

These effects would be more pronounced in places without any barriers between them Atlantis, the source of the massive tsunami.

That's my theory, anyway.

Dinosaur Swamp says that's exactly what happened to the Eastern Seaboard.

[SittingBull]

Dinosaur swamp have anything good in it besides dinosaurs?

[SittingBull]

Very true. I had read that but never really let it sink in, very good.

Thank you

[SittingBull]

South East Virginia here so I know what you mean kinda.

[Subjugator]

It's got barbarians, mutants, optional types of wilderness scouts, dinosaurs (duh!) both domestic and alien...

No, he's talking about in Rifts earth...not real life.

/Sub

[Todd Yoho]

...a TON of regional data (more than most world books).

Glad you like the DS books. I'm from Raleigh, so I wanted the books to be as much about the region as they are about the dinos.

[SittingBull]

There are posts of mine missing. >.> Odd.

[Ectoplasmic Bidet]

There are a surprising number of us North Carolinians around here.

[SittingBull]

South east Virgina here.

[Icefalcon]

I used to live in Southern Maryland before I moved to Minnesota.

[Tor]

I don't think he's referring to it going to another dimension. I think he's referring to the water occupying the space freed up by the land rising. Unless the entire continent rifted in (which is possible), it didn't pop out of thin air. The mass would've come from somewhere. I presume his hypothesis is that it was from the bottom of the ocean, and therefore offsets the localized rising land mass by land mass lowering elsewhere.

Yes, well we know full well Atlantis did not sink in Rifts, it was rifted in from the dimensional limbo it ended up being rifted off to during the low-magic era.

if a continent the size of Atlantis popped into the ocean, displacing its total volume of water outward, there might not actually be much left of North America (edit: or Europe, or Africa, or the Mediterranean) other than bedrock. Such an event would generate 'megatsunami', which put earthquake-generated waves to shame

Wouldn't the amount of kick generated by Atlantis landing in the ocean depend on how much it weighs? We don't know how deep it would sink or the volume of water it would displace.

All we can do is estimate that volume based upon how much land got covered by the rising tides.

Although: did Atlantis pop in right at the start of the Cataclysm, or near the end? Perhaps guys like Tiklik created receding water levels prior to Atlantis' return, potentially saving us from a lot of damage?

Well when dimensions switch places in the eastern half of the US, they don't displace the dirt etc etc. (I forget what they call that)

D-Shifting is what they call it.

Are you guys discussing Fade Towns or some other phenomena? The cities rifted into South America from other dimensions?

I think that's how it worked with Atlantis, for the most part it swapped places.

Well clearly not utterly since we wouldn't have an explanation for the risen water.

That's because in the case of D-shifting, it's an anomaly that doesn't actually teleport an object to earth, but kind of temporarily teleports people to another dimension, even though they're still on rifts earth. Enter: Paradox

I dunno if it's a paradox, but it's a confusing dimensional straddle type thing. Kinda like what's going on with Psyscape, which is slightly different than a normal Astral Kingdom since you can apparently enter into the plane from ANY direction as opposed to set portals. Then again, maybe it's just like... 5 portals (like the sides of a cube) surrounding it, since I don't think Between the Shadows ever put a size limit on portals.

"And then came the Collapse. With a rumbling heave that sounded like (the) end of the world, the earth thrust the island of Manhattan a thousand feet (305 m) into the air and then crashing back down 500 feet (152 m)." WB 29: Madhaven pg. 9

I'm a bit confused here, if you go up a thousand feet, come down five hundred, wouldn't that leave you floating 500ft in the air?

[Tor]

Ah okay, I was thinking of Manhatten coming out of the land entirely kind of like TMNT3: The Manhatten Project for NES.