reply to post by korathin
Eastern PA would be affected only minimally, if at all. It's a fair way from the New Madrid fault zone. The big quakes of 1811/1812 hit in the region
of northeast Arkansas and southeast Missouri, but pretty recent research indicates that if we also include the Wabash Valley fault zone in Illinois,
there are eight states that could be affected to a varying degree, namely (in alphabetical order) Alabama, Arkansas, Illinois, Indiana, Kentucky,
MIssissippi, Missouri and Tennessee.
If you have a bit of time to read up on it, a good place to start would be the report that FEMA has used as a major basis for a lot of its planning.
Okay, many have their grouches about FEMA, but the report seems pretty sound from the point of view of what might might happen and where, so it's
worth a look through. It also includes some excellent maps. Note that this is a .pdf file so if you're on dial-up it'll take a while to load:
Earthquakes on the Central USA
I've only linked to the main report, without all the appendices which would otherwise make the thing hundreds of pages long. This is just the basic
report but it should keep you busy for now.
Bear in mind that report is looking at scenarios only. It doesn't say what will
happen, only what might
happen, based on what they know
from studies. Things could be less bad, or to be honest they could also be worse, but the key thing for you is that eastern PA is a fair ways from
this and you shouldn't have major problems there due to the New Madrid fault.
About coal mines collapsing due to quakes. It depends on the type of mine and the quake. How deep the mine is, how extensive the workings are below
ground and so forth, how big and violent the quake is in terms of energy release, duration and aftershock activity, how close it occurs to the mine/s,
and also how deep the quake's hypocenter is. In other words, without knowing all those details no-one could give you much of an answer. I'm no expert
so I couldn't give you a defintive answer even if I had all that data, but even an expert would say that their answer is only suppostion and not a
edit on 8/3/11 by JustMike because: typos.