On 2002-02-11 15:18, HopefulCynic68 wrote:
On 2002-02-11 13:24, Barbara wrote:
One other thing about that region that comes to mind, though I never was motivated to learn the details: there is a big fault near New Madrid, Mo. that runs down into this valley. I can remember people talking about long-ago earthqakes having "made the land good". However, I never gave much thought to figuring out why, not into geology. :smile:
I don't know about making the land good, but the NM fault is one of the most potentially powerful in North America. About 200 years ago (not quite that, actually), this baby produced an earthquake which shook the entire eastern half of the continent.
Among other things, this monster quake:
1. Altered the flow of rivers.
2. Produced 'sand boils' all over the region.
3. Created lakes.
4. Seriously damaged structures as far away as Detroit and Washington, D.C.
This was in the days when much of the region was very sparsely settled. If the same quake repeated itself today (and it could), the resulting potential damage would be all but
incalculable. The primary zone of such a quake would be a region containing:
1. Memphis, Tennessee.
2. St. Louis, Missouri
3. Cinncinatti, Ohio.
4. Nashville, Tennessee
Plus numerous other cities only slightly less affected, including Chicago, Detroit, Indianapolis, etc. There would probably be some damage and death in western Virginia, Washington, D.C., etc.
Death tolls could in theory go into the millions, property damage would be beyond anything ever experienced in American history. Hmmm...that might do as as 4T trigger. :wink: