Skip to comments.Another Earthquake in Virginia - house just shook for 5 seconds
Posted on 08/24/2011 10:13:03 PM PDT by WL-law
Here in Shenandoah Valley of Virginia, west of Charlottesville, we just had another earthquake, 2 minutes ago. Not as strong as the 5.9 quake earlier this week.
Also felt it here in Northern Virginia. Just a brief rattle, but it worried the cats.
jolt or roll?
Magnitude 4.5 - VIRGINIA
2011 August 25 05:07:50 UTC
This event has been reviewed by a seismologist.
Thursday, August 25, 2011 at 05:07:50 UTC
Thursday, August 25, 2011 at 01:07:50 AM at epicenter
Location 37.940°N, 77.896°W
Depth 5 km (3.1 miles)
7 km (5 miles) S (171°) from Mineral, VA
13 km (8 miles) SE (135°) from Louisa, VA
31 km (20 miles) NE (48°) from Columbia, VA
38 km (24 miles) E (86°) from Lake Monticello, VA
59 km (36 miles) NW (320°) from Richmond, VA
133 km (82 miles) SW (216°) from Washington, DC
Location Uncertainty horizontal +/- 11.3 km (7.0 miles); depth +/- 3 km (1.9 miles)
Parameters NST= 94, Nph=109, Dmin=52.3 km, Rmss=1.41 sec, Gp= 86°,
M-type=”Nuttli” surface wave magnitude (mbLg), Version=5
Magnitude: USGS NEIC (WDCS-D)
Location: USGS NEIC (WDCS-D)
Event ID usc0005jg1
It started abruptly, and shook the house pretty vigorously - I was up on the 3rd floor, where the shake sensation is amplified.
Felt it in Powhatan, VA. The cats are NOT happy.
Is that at USGS? Do you have a link? I can only see a map, but not that stuff. It woke us up here near Culpeper.
A geologist explained the difference in sedimentary rock and the hard in place rock. The limestone layer would simply roll as that of sand on the beach.
Thank you. I found out you had to click on the “M3” link.
Take care. I have relatives in Louisa.
That’s a pretty nifty stat sheet. Where’d you find it?
Sorry. That was no aftershock. I just had gas.
Yes, a minor aftershock in Arlington, Va. Just enough of one for FRers to post about here.
Guess what? The world didn’t come to an end yesterday despite what Greta Van Sustren said.
Meanwhile, last week there was an almost unheard of snowstorm in New Zealand, and skiers were besides themselves with joy. (I don’t know who “Joy” is but she was very popular that day).
Weird seeing snow covering the earthquake damaged large church in the center of Christ Church, NZ.
Next: Coming to a sky near you, “Falling Frogs”.
Earthquakes are unsettling, aren’t they? If the ground is not firm, then what is? My first earthquake was on Terceira Island, Azores, at the U.S. base there, on Santa Rita Hill. Strange feeling. Lasted long enough to make me think: how much longer? A number of years later a major quake hit the island and almost leveled the chief town on it.
Too close for me. You can almost see my place on that map.
Felt it here in Halifax va. Scared me I was sleeping on the couch I had fallen asleep studying and it was.shaking pretty bad... Scared me
We felt it in Front Royal. It woke us up and my 6 year old daughter was yelling her bed was shaking.
Near the DC line I was sitting at my computer and noticed a slight rattle of things on my computer desk. I looked at my watch. It was between 1:05 and 1:10 am. I guess it was an aftershock, the first one I have actually noticed.
If the ground isn’t firm, esp. if it is loess (loose soil), devastation can be 100% as in Ti Chung, China where an oil city/facilities were leveled with over 250,000 deaths, about 15-20 years ago.
Same for the soils in Missouri.
Here in Virginia/DC, we are on basal rock, i.e. granite, gneiss, etc. very hard and thick. Further west into Virginia you get into Triassic Redbeds (red sandstone shale formations which are very layered, allowing vibrations to travel thru them like shit thru a goose). Once you get to the Appalachian Mountains, Blue Ridge, Granite mountains of W. Va and Tenn., you are getting into older solid formations as well as the dolomite limestone of the Ordovician-Devonian era (200 million-350 M, etc). Penn. has Carbonaceous era coal formations - not very solid, as well as good dolomite limestone.
Ohio has good limestone and great Ordovician/Cambrian trilobites.
I would say that a solid limestone formation cracked in the initial quake which would account for the sharp loud cracking sound I heard in Arlington, Va. with little vibration.
about 22 miles from there - asleep....
Just an aftershock. Those could continue for years. We still get occasional aftershocks out here from the 1994 Northridge Quake.
God’s not happy and I can’t say I blame him.
Yes felt it here in spotsylvania va too 4.5
Yow...that sounds like one of the strongest aftershocks yet. The one at 8 PM the night of the quake was also in the 4’s...4.2 I think?
We had been in Mineral visiting family, but we came back home to Jersey last night. I’ll have to check in with my in-laws, see what they felt. That magnitude 4 aftershock was the only one besides the original quake that made us take cover.
1 AM though...yeesh. That’s nasty when folks are in bed.
We are 100 miles north of the epicenter, Winchester, VA. The first quake shook the house and rattled the windows. The after shock early this morning was unnoticed by me as I was asleep as the time.
Some folks have reported that their well water is still muddy.
For those who live close to Mineral - Consider this!!!!!!
East coasters have probably never even considered earthquake insurance. It’s often a separate rider, maybe 200 bucks or so annually for a home. But standard homeowners doesn’t cover quake damage. So if your home or small business was damaged, You may end up having to pay yourself to fix it.
Oh please! Please educate yourself on the Mayan calender... Even the ancestors of the Myna’s, who are trying to restore their heritage in Mexico, are amazed at all the fuss!
To them it’s the end of calender and the beginning of a new one!
I have an earthquake rider on my homeowners insurance; it’s around $180 per year. The deductible is $10,000 on structural damage.
It’s an aftershock, and they are going to continue for awhile.
That’s just the roots from the Tree of Liberty as they’re being ripped from our soil.
I vaguely remember waking up about that time, then rolling over and falling back to sleep. It was probably the aftershock that woke me (I’m in Alexandria VA).
Still clustering in Colorado.
Oh, please, please recognize that my post was in jest ;-))