Virginia Earthquake of 2011, Aug 23

[rhody]

Felt it outside of Philly - my first. Didn't realize what it was at first.

Http://www.usgs.gov

Felt like 15 sec of 1 inch, side to side oscillations at around 80hz

Ok, Russ, I can buy 15 seconds of one inch movement, I will give you that, but how in the world did you come up with 80Hz ?
Technical reports of the earthquake, or seat of the pants feel, and if seat of the pants feel, how do you know it was 80hz ? lol.

Rhody...

 

[TheStatutoryApe]

I have a lady friend in the DC area that is apparently really freaked out by the quake. I never pay all that much attention but from what I remember of my own experiences 5.9 isn't very bad. Just very.. noticeable.

 

[daveb]

Freaking AWESOME! I've always wanted to feel one and I finally have. Ok Hurricanes: Check. Earthquake: check. Up next is a tornado.

I've never had any of those. How come everyone else gets to suffer through catastrophes and I don't? My life sucks!

Well, living only 2 miles from the epicenter of the Northridge quake back in the early 90's, I can say you'd probably change your mind if you went through one of those.

 

[wuliheron]

There was an earthquake in Oakland tonight. How come we don't get a thread for it?? Oh yea, we get em all the time >_>

I had a housemate once in silicon valley who had never been in an earthquake and was terrified of them. Within a couple of months moving there he got caught twice on the toilet.

I'm in Virginia Beach now and when my monitor started swaying I just looked out the window, saw that none of the building or trees were falling down, and went right back to work.

 

[wuliheron]

Well, living only 2 miles from the epicenter of the Northridge quake back in the early 90's, I can say you'd probably change your mind if you went through one of those.

I've got friends who live about 2 miles from the epicenter of this quake in Va. So far the worst I've heard happened was a few book cases falling over and one oversized fish tank being destroyed. These people don't even know how to drive on icy roads much less deal with an earthquake, but when it comes to hurricanes and tornadoes they're prepared.

 

[Jack21222]

I live in a suburb of Baltimore, just about 150 miles from the epicenter, and I felt nothing. Neither did the other two people in my house. Apparently, it was strong enough to cause some damage to older buildings about 20 miles away, but for some reason, we got nothing here.

My girlfriend texted me to ask if I was alright, and I said "yeah, why?" She said "earthquake" and I said "huh?" She was shocked I didn't feel anything. My grandmother called my mother about it, and when my mother said she didn't feel anything, my grandmother asked my mother "are you on pills or something?"

I'm a little bit disappointed. It would have been neat to feel an earthquake.

 

[ljdramone]

I was on the 4th floor of an 8 floor office building in downtown DC. There were a couple of jolts that felt like a heavy truck going by, then a pause just long enough for people to start wondering what was happening before the peak motion started. It lasted about 30 seconds, I think. I don't remember any noise at all. We were debating whether it it was an earthquake or a terrorist bomb or what when the building alarm went off and everybody evacuated.

Walked past an old stone church near Mt Vernon Square later, and saw some minor damage from the quake, with chunks of masonry lying around that had fallen from the steeple.

 

[CosmicEye]

These people don't even know how to drive on icy roads much less deal with an earthquake, but when it comes to hurricanes and tornadoes they're prepared.

Yeah right. There was no milk and some of the shelves were stripped in the Grocerystore after the EQ How lame is that. People can't even drive when it drizzles here. I can understand a heavy downpour but Christ, the speedlimit goes from 45 to 20 with a sprinkle.

 

[DoggerDan]

It's not a real earthquake until it ships water out of the toilet.

 

[Astronuc]

          UTC DATE-TIME       LAT      LON     DEPTH    Location
Mag       y/m/d     h:m:s     deg      deg       km  
5.8   2011/08/23 17:51:04    37.936  -77.933    6.0    8 km ( 5 mi) SSW of Mineral, VA   
2.8   2011/08/23 18:46:50    37.931  -77.935    0.1    9 km ( 5 mi) SSW of Mineral, VA   
2.2   2011/08/23 19:20:26    37.911  -78.004    0.1   13 km ( 8 mi) S of Louisa, VA   

4.2   2011/08/24 00:04:36    37.912  -77.951    7.9   11 km ( 7 mi) SSW of Mineral, VA 
3.4   2011/08/24 04:45:26    37.925  -77.994    4.9   11 km ( 7 mi) S of Louisa, VA 

2.5   2011/08/25 04:06:47    37.923  -77.988    0.1   11 km ( 7 mi) S of Louisa, VA 
4.5   2011/08/25 05:07:50    37.940  -77.896    5.0    7 km ( 5 mi) S of Mineral, VA 
2.3   2011/08/25 06:37:31    37.912  -77.969    0.1   12 km ( 7 mi) SSW of Mineral, VA 
2.4   2011/08/25 15:27:47    37.951  -77.924    0.1    6 km ( 4 mi) S of Mineral, VA 
2.6   2011/08/25 23:40:56    37.903  -77.814    4.9   14 km ( 9 mi) SE of Mineral, VA

17:51:04 UTC = 01:51 PM EDT

This is interesting, not only since it was about 8-9 miles from a nuclear plant, or that the magnitude of the initial event was within about 0.2 to 0.3 mag of the DBE of the NPP, but they have having a little swarm - and this is an area that doesn't normally get 4s and 5s.

In the NE, there's been a few more tremors.

It bears watching, because something has changed.

 

[Evo]

          UTC DATE-TIME       LAT      LON     DEPTH    Location
Mag       y/m/d     h:m:s     deg      deg       km  
5.8   2011/08/23 17:51:04    37.936  -77.933    6.0    8 km ( 5 mi) SSW of Mineral, VA   
2.8   2011/08/23 18:46:50    37.931  -77.935    0.1    9 km ( 5 mi) SSW of Mineral, VA   
2.2   2011/08/23 19:20:26    37.911  -78.004    0.1   13 km ( 8 mi) S of Louisa, VA   

4.2   2011/08/24 00:04:36    37.912  -77.951    7.9   11 km ( 7 mi) SSW of Mineral, VA 
3.4   2011/08/24 04:45:26    37.925  -77.994    4.9   11 km ( 7 mi) S of Louisa, VA 

2.5   2011/08/25 04:06:47    37.923  -77.988    0.1   11 km ( 7 mi) S of Louisa, VA 
4.5   2011/08/25 05:07:50    37.940  -77.896    5.0    7 km ( 5 mi) S of Mineral, VA 
2.3   2011/08/25 06:37:31    37.912  -77.969    0.1   12 km ( 7 mi) SSW of Mineral, VA 
2.4   2011/08/25 15:27:47    37.951  -77.924    0.1    6 km ( 4 mi) S of Mineral, VA

17:51:04 UTC = 01:51 PM EDT

This is interesting, not only since it was about 8-9 miles from a nuclear plant, or that the magnitude of the initial event was within about 0.2 to 0.3 mag of the DBE of the NPP, but they have having a little swarm - and this is an area that doesn't normally get 4s and 5s.

In the NE, there's been a few more tremors.

It bears watching, because something has changed.

I thought it was normal for any earthquake to have aftershocks for months.

Scientists are actually surprised at the low number of aftershocks.

"Low" number of Va. earthquake aftershocks felt

For the size earthquake that occurred, I think the number of aftershocks so far has been remarkably low," said Amy Vaughan, a geophysicist with the USGS Earthquake Information Center in Colorado. "I don't know if that's an indication of things to come or not. ... There's likely there will be some more, but I don't know for how long and how large."

http://www.cbsnews.com/stories/2011/08/24/national/main20096620.shtml

It would be bad it this turns out to be a foreshock and a larger earthquake is yet to come.

 

[Astronuc]

Given a 5.8 mag, the aftershocks are not surprising. There are usually some aftershocks.

Of interest is - what has changed that initiated the 5.8 mag in an area that rarely gets those kind of quakes.

We see small quakes - on the order of 2s or 3s - and these are usally isolated. We could have a 4, but that would be unusual.
Recent earthquakes in NE US - http://www.ldeo.columbia.edu/cgi-bin/quake.cgi