Several things about this quake, and why we west coasters should NOT make fun
1.- The SUBSTRATE is ancient rock... so it rings like the proverbial bell... and it is felt quite further away from the epicenter than it would in places like San Diego... which is far much newer, aka younger rock.
2.- The west coast has this thing called Building Codes... we more or less build for this shit and for the most part can laugh it up when it is a six pointer... now a seven pointer Mexico City laughs we don't.
3.- This is quite the new thing for a lot of folks in the East coast.
Now to the East coasties... let me reach for that disaster manager hat.
Realize that there are a few things that can get affected even with a six pointer, even in San Diego... water mains come to mind. So for the next few days... consider getting bottled water. THis is a little into how you build these things, but your main water main, potable water, runs side by side to your waste water... and at times they get cracked and it mixes.
Also check your house for obvious cracks. If you find any.. chances are it is not structural, still have it checked by an engineer. Be ready for after shocks.
4. I'm wondering if the type of rock we sit on means that we get
less damage from the quake. I was thinking that the ground at the epicenter may just transmit a single slap rather than repeated rocking back and forth. At the same time, the fact that the quake was felt over such a great distance suggests that the energy is diffused over a large area.
Depth of quake... the closer to the surface the worst the damage, rule of thumb
TYPE of quake... it will generate different wave forms. Some wave forms are more damaging than others.
SUBSTRATE type... in fact the old rock has a better potential of damage... because it does magnify how they are felt. Thankfully it is a really ancient slab so the frequency of these things are really low. But when the New Madrid fault goes... oh my. Last time, it changed the course of the Mississippi (It is estimated at 9.0)
And of course once you reach a built up area... the buildings and how they interact with the wave form... at times you have a phenomena called resonance, where it makes it feel worst, (and it is) and leads to more damage. This phenomena was first identified during the mexico city quake where buildings side by side but at a 90% angle reacted different to it.
27. An interesting side light from the New Madrid quake:
a lot of land near the Mississippi liquified during the quake, so buildings, people and animals were seen to sink into the earth. After the quake, the ground was once again solid. I think this is where Americans get the idea that during an earth quake the ground opens up to swallow things.
Problem is that the EAST COAST has a much lower seismic threat (except new madrid area) so it has really not gotten ready. I would not be too shocked if the West Coast states are prepared to send a few.
14. Thank you and God Bless you Nadin. The people making fun of this
and saying it was no big deal were not here. I can tell you it scared the crap out of me. I literally saw the walls moving back and forth like a house of cards. It was also very loud. I am 70 miles from epicenter.
I am grateful my husband and I are okay.
Drawers open in all the dressers upstairs and lots of broken crystal/china in my china cabinet. No other damage that I know of at this moment.
they are a little different. They have tried over the years, but the retrofitting cost goes into the cost \benefit. Yes, when New Madrid goes it will be epic, but try to convince people they are in an earthquake zone.
Also when city managers see the cost of enforcing a quake series of codes they usually balk, and it does raise the construction cost.
Up here where I live in Western Mass, we concern ourselves with different kinds of structural codes which take into account snowfall on roofs and stuff.
Which isn't to say we never get earthquakes here, because we do. Last one I remember was in 2003 or so...a 3.something in a nearby town. I did feel that one...
Anyway, I'm in the hilltowns. On the side of a hill at 1300 ft, and we didn't feel a thing here. But a friend of mine who lives in Canada said she felt it. So it went by us, didn't shake the hill, and went on to give Ontario a bit of a jolt.
30. Consider how much SHIT we californians get on a regular basis... let us have our initial fun...
But make no mistake we take it VERY seriously because we KNOW that you out there don't have any kind of earthquake code to speak of. from what I've seen the buildings are made to withstand hurricanes and heavy snowy winters (I might add a great deal of California gets snowed in every winter, we get tornadoes and the occasional hurricane!)
Quite often it's the duration of the quake rather than the intensity that makes it dangerous. Since you're on bedrock, you're in MORE danger than we in California. we have a lot of sand and shifting earth (all those micro quakes) you don't.
As noted above, the fact that you're on a solid shelf makes it worse because the intensity doesn't disperse as fast as it does in the west.
Again, I hope all is well, but the reports will slowly trickle in. people aren't used to this ad are probably in shock that it happened at all. Hurricane code is fine, but this being a 5.8 would do start to do some real damage to more rigid buildings.
the way the MSM is portraying this as a "disaster." As far as we know, there's been no loss of life, no MAJOR structural damage, phone lines are busy but the infrastructure remains and CNN/MSNBC/FAUX/HLN are all reporting it as if a Cat. 5 hurricane just came rolling through. THAT'S what I'm shaking my head at.
37. Good point about the water mains. In the larger cities, the water mains
are well over a hundred years old. Baltimore has a water main break at least weekly, if not more often. Can't imagine the damage a quake could do to their infrastructure. Same for NY, Philly, Boston, etc.
44. Our county mayor has been tweeting faster than a rabid squirrel this afternoon...
He's been referencing the very things you have said to check. And has sent out several links to earthquake preparedness and to expect after shocks. I am pretty sure that we do not have any quake plans here (at least officially).
No alerts about water, yet. We have been requested to check for leaks.
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