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2:39 pm
February 8, 2009
Offline3:09 pm
June 1, 2010
Offlineokay, the chronically curious here:
A 5.8 magnitude (not small potatoes!) earthquake centered northwest of Richmond, Va., shook much of Washington, D.C., and was felt as far north as Rhode Island and NYC. People have reported feeling the quake in East Tennessee just before 2:00 pm.
The U.S. Geological Survey said the earthquake was 3.7 miles deep. It was centered 80 miles west of D.C., but it was felt in New York City, Detroit, North Carolina and Boston. USGS said the reason the earthquake was felt in such a wide area is because the ground under the East Coast is more attached because of a lack of earthquake faults.
Shaking was felt at the White House and all over the East Coast, as far south as Chapel Hill, N.C. Parts of the Pentagon, White House and Capitol were evacuated. The National Park Service says all National Mall monuments and memorials were closed and evacuated after the quake.
3.7 miles deep? what the heck would initiate an earthquake at that depth inside the crust? Unless there is a fault hidden that deep. On the upside the shaking would be more generalized (widespread) compared to fault shifts which can be downright body-tossing. Or wave-inducing if one considers the Japan event last spring. Yeesh, and there's still Irene bearing down on the east coast … nature is racking up the score this year.
Ruthmarie, this explains the difference between earthquakes experienced on faults, and the earthquake that just happened in central VA.
4:29 pm
March 22, 2010
Offline@Ruthmarie: 3.7 miles isn't very deep for an earthquake. We had one a few days ago here in Long Beach, CA that was 12.2 miles deep. It was a 3.1 and the epicenter was only about 2 miles from here, but it barely shook at all.
That old, hard crust of the earth on the east coast is more effective at propogating waves, so eastern earthquakes are felt over a wider area. In addition, they produce more high frequency waves, so smaller buildings, like houses, shake more. (Did I mention that my DH was a geologist?) So it isn't that east coast people are just wimpier about earthquakes. Although it is true that for a California native, an earthquake that does no damage is no big deal. But my first thought when I heard about this one was about all the brick buildings back there. There's a reason you don't find many brick buildings in California, and that those you do see are heavily reinforced. Brick buildings tend to shake apart and fall down in earthquakes. Brick buildings make me nervous.
@dede: I LOL at "curiousity satisfied"! Yep, now you've been there, done that, don't need to do it again.
But now that y'all have experienced an earthquake, don't you think that tornados are scarier? I do.
6:04 pm
February 22, 2010
Offline7:30 pm
March 22, 2010
Offline@bonita:
LOL.
I’m kind of an earthquake geek; I have a real-time earthquake map on my home page. In the last week there have been earthquakes in Machias, ME; Altamont, NY; Girard, OH; Marston, MO; Risco, MO; Ridgely, TN; Maryville, TN; Alex, OK; Spencer, OK; and a dozen or so around Cokedale, CO. (Plus bunches west of the Rockies in Montana, Utah, Nevada, Washington, Oregon, and of course, California.) But most of them were little onesies and twosies that you don’t even notice.
The thing is, in California we typically get two or three hundred a week. In the last week we’ve had about 340. Of course, that’s spread over a large area, but unless one gets up to about the magnitude of today’s Virginia quake, we don’t get very excited about it. We kinda wait to see if things are going to start falling off shelves, and if they do, then we move under a stout table or into a hallway or other protected spot. But I have a confession: I get seasick in large quakes. Not in boats, not in cars, just in earthquakes.
By the way, a point of information for those of you who don’t live in earthquake country (usually!!). Running outside is generally NOT a wise move. Outside there may be bricks falling, broken windows falling, building facades coming loose, live power lines down, etc.; besides which, you may lose your balance and fall. Better to get under a sturdy table inside. Even in the unlikely event that the building collapses, you stand a good chance of being in a protected pocket where they’ll be able to get you out. AFTER the earthquake stops, you can move outside to an open area if it’s safe to do so. Stay away from buildings outside. I saw pictures of people in DC today staring up at broken windows from right under them. Hello??!! Falling glass?
@Liz: cool, that class in geology an age ago left a bigger print in my head about deeper faults … thank you for the info website.
@whaledancer: the quakes I've felt in northern CA have mostly been on the coast or vibrating inward to the central valley so more likely sliding surface faults vs deep earth. I did live 10 years in MA but barely felt a tickle with those slight tremors. The largest body tosser I've experienced had a 6.something epicenter just off CA shore to the north coast redwoods. Listening to the trees shake, crackle and creak was freakish … not to mention the rippling of the ground or the wild sloshing of the Eel River alongside the camp area. It was my midwest DH first experience with an earthquake … he was inside the back of the truck yelling at me to stop bouncing it when he realized how white I was eyeing those really, really tall trees (no. place. to. run.). Then it was a flip of a coin as to which of us turned whiter. That was an interesting stop on the honeymoon, lol!
I would never suggest east coast denizens are wimpy about earthquakes because no one will ever convince me that tornadoes or hurricanes are less scary than a tremblor. I have no desire to live in the midWest or the South East. Earthquakes are usually short and quickly over with whereas tornadoes are beyond nightmarish in abrupt strength and hurricanes last for hours. Egad, no thanks!
whaledancer said: "AFTER the earthquake stops, you can move outside to an open area if it’s safe to do so. Stay away from buildings outside. I saw pictures of people in DC today staring up at broken windows from right under them. Hello??!! Falling glass? "
Just caught this after posting above … LOL! oh, heck, yes, exactly what I was yelling at the screen about an hour ago!
I think I prefer it best in the mountains. Very little impact from hurricanes (rain mostly), tornadoes are rare and earthquakes pretty much non-existent. Our only "bad" weather is snow. And I can happily deal with that! Even if it means we get stuck for 3 weeks at a time.
7:55 pm
December 28, 2008
OfflineSo far, I can accept my experience with earthquakes, tornadoes and hurricanes. Managed to ride out a small hurricane years ago, and felt the effects of glancing blows from a couple of tornadoes. In my experience, it's pretty difficult to move anywhere that is completely immune from weather catastrophes, but we do try.
It was most odd today to discover that I hadn't noticed the earthquake! Evidently the mottled shade I was in and my play with the chickens kept me from seeing/feeling what was happening right under my feet. And it was intermittently overcast, further confusing things.
Just weird.
7:57 pm
May 7, 2011
OfflineWe all learn to deal with nature in our own little corner of the country. I would no more know how to deal with a hurricane or an earthqauke than someone from CA could/would know how to deal with severe weather in the midwest.
When my daughter was in college there was a tornado warning for there and they asked someone from CA the course of action he would take. He said "Get in a doorway".
I have seen/watched tornadoes destructive force.
I have seen the aftermath of a hurricane.
Have not felt an earthquake (that I am aware of).
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