Oklahoma Earthquakes 2011

[SOONER8693]

Just had a STRONG earthquake here in far SW OKC. Strongest I've ever felt. Lasted about 25-30 seconds.

[venture]

Rumble rumble.

[jbkrems]

I felt something up here in OKC/Edmond, too. I've never felt an earthquake, but my 2nd floor apt was shaking.

[venture]

Still trying to get information on the earthquake we just had. OGS is down and nothing on USGS just yet.

[adaniel]

I knew I wasn't the only one to feel that. It was strong enough to wake me up here in Midtown. A bit scary since I'm in the third floor of an old building.

[venture]

Magnitude
4.7
Date-Time
Saturday, November 05, 2011 at 07:12:45 UTC
Saturday, November 05, 2011 at 02:12:45 AM at epicenter
Location
35.570°N, 96.703°W
Depth
4.9 km (3.0 miles)
Region
OKLAHOMA
Distances
9 km (6 miles) N (352°) from Prague, OK
11 km (7 miles) ESE (113°) from Sparks, OK
14 km (9 miles) WNW (300°) from Paden, OK
33 km (20 miles) NE (40°) from Shawnee, OK
76 km (47 miles) E (82°) from Oklahoma City, OK
308 km (192 miles) N (1°) from Dallas, TX
Location Uncertainty
horizontal +/- 12.9 km (8.0 miles); depth +/- 3 km (1.9 miles)
Parameters
NST=240, Nph=246, Dmin=90.2 km, Rmss=1.31 sec, Gp= 18°,
M-type=body wave magnitude (Mb), Version=9
Source
Magnitude: USGS NEIC (WDCS-D)
Location: USGS NEIC (WDCS-D)
Event ID
usb0006k8b

[aintaokie]

Bump.....

[Dustin]

I felt it in N OKC.

It took me a while to realize that was an earthquake. It sounded like someone opened a door in the house and a bunch of air rushed in and made the walls creak and crack. The ground only shook a little bit.

That was a first for me!

[aintaokie]

Bump......4.7

[jbkrems]

Yeppers, according to USGS.

[Dustin]

Facebook just came alive!!! EVERYONE felt this thing. Tulsa, Stillwater, S OKC...

[Dustin]

Arkansas, Kansas, Missouri reports as well.. wow.

[venture]

http://earthquake.usgs.gov/earthquak...k8b/index.html

Some interesting info there.

[MikeOKC]

http://earthquake.usgs.gov/earthquak...k8b/index.html

Some interesting info there.

According to this chart from OK Geo Survey....this 4.7 ties for the second biggest in Oklahoma history - or, at least since seismic recording.

[venture]

Magnitude
3.4
Date-Time
Saturday, November 05, 2011 at 07:27:20 UTC
Saturday, November 05, 2011 at 02:27:20 AM at epicenter
Time of Earthquake in other Time Zones
Location
35.566°N, 96.698°W
Depth
5 km (3.1 miles) (poorly constrained)
Region
OKLAHOMA
Distances
33 km (20 miles) NE of Shawnee, Oklahoma
67 km (41 miles) W of Okmulgee, Oklahoma
68 km (42 miles) SSE of Stillwater, Oklahoma
75 km (46 miles) E of OKLAHOMA CITY, Oklahoma
Location Uncertainty
horizontal +/- 11.7 km (7.3 miles); depth +/- 9.4 km (5.8 miles)
Parameters
Nph= 0, Dmin=0 km, Rmss=1.23 sec, Gp= 0,
M-type="Nuttli" surface wave magnitude (mbLg), Version=4
Source
Magnitude: USGS NEIC (WDCS-D)
Location: USGS NEIC (WDCS-D)
Event ID
usb0006k9x

[MikeOKC]

Magnitude
3.4
Date-Time
Saturday, November 05, 2011 at 07:27:20 UTC
Saturday, November 05, 2011 at 02:27:20 AM at epicenter
Time of Earthquake in other Time Zones
Location
35.566°N, 96.698°W
Depth
5 km (3.1 miles) (poorly constrained)
Region
OKLAHOMA
Distances
33 km (20 miles) NE of Shawnee, Oklahoma
67 km (41 miles) W of Okmulgee, Oklahoma
68 km (42 miles) SSE of Stillwater, Oklahoma
75 km (46 miles) E of OKLAHOMA CITY, Oklahoma
Location Uncertainty
horizontal +/- 11.7 km (7.3 miles); depth +/- 9.4 km (5.8 miles)
Parameters
Nph= 0, Dmin=0 km, Rmss=1.23 sec, Gp= 0,
M-type="Nuttli" surface wave magnitude (mbLg), Version=4
Source
Magnitude: USGS NEIC (WDCS-D)
Location: USGS NEIC (WDCS-D)
Event ID
usb0006k9x

So, there were two quakes over 4.0 fifteen minutes apart?

[venture]

The 2nd is a 3.4, aftershock of the first one.

[MikeOKC]

The 2nd is a 3.4, aftershock of the first one.

Where did I get that 4.0? Probably because it's 3:20 in the morning. Thanks for the clarification!

Probably the biggest shaker in the metro area in the lifetime of anybody under 60.

[dmoor82]

Well damn,I did'nt feel it but oddly enough I've been up since that time,so I think it shook me out of bed?

[venture]

Magnitude
2.7
Date-Time
Saturday, November 05, 2011 at 07:44:34 UTC
Saturday, November 05, 2011 at 02:44:34 AM at epicenter
Location
35.488°N, 96.755°W
Depth
5 km (3.1 miles)
Region
OKLAHOMA
Distances
6 km (4 miles) W (272°) from Prague, OK
11 km (6 miles) NE (42°) from Johnson, OK
13 km (8 miles) E (95°) from Meeker, OK
23 km (14 miles) NE (45°) from Shawnee, OK
71 km (44 miles) E (89°) from Oklahoma City, OK
299 km (186 miles) N (1°) from Dallas, TX
Location Uncertainty
horizontal +/- 14.9 km (9.3 miles); depth +/- 3.1 km (1.9 miles)
Parameters
NST= 12, Nph= 20, Dmin=99.1 km, Rmss=0.99 sec, Gp=115°,
M-type="Nuttli" surface wave magnitude (mbLg), Version=3
Source
Magnitude: USGS NEIC (WDCS-D)
Location: USGS NEIC (WDCS-D)
Event ID
usb0006kat

[MikeOKC]

Quake #3....aftershock....2.7.... at 2:44am
http://earthquake.usgs.gov/earthquak...usb0006kat.php

[MikeOKC]

KOCO Livewire is active. Interesting how far away it was felt.
http://livewire.koco.com/Event/Live_...oma_Earthquake

[silvergrove]

Venture, do you think this recent 4.7 relieved most of the stress that may have accumulated in that region or is it more to come?? From what I read about the Meers fault line (in no relation to the earthquakes around here), there was a potential big one several thousand years ago. It was estimated to be at least 7 or 8 magnitude. Think this may be a similar intracontinental fault area?

[venture]

Venture, do you think this recent 4.7 relieved most of the stress that may have accumulated in that region or is it more to come?? From what I read about the Meers fault line (in no relation to the earthquakes around here), there was a potential big one several thousand years ago. It was estimated to be at least 7 or 8 magnitude. Think this may be a similar intracontinental fault area?

It is pretty late, so my mind isn't quite with it. I want to say this is the same fault line that we had the 4.6 (or whatever it was finalized at) about a year ago. If that is that case, could estimate that we are going to see this remain pretty common to have the hundreds of smaller 3.0 or less quakes every year. Then once a year or so have a large 4.0 or higher that comes around. Of course, I'm not the expert when it comes to this. We could very well see this take care of things for awhile or it could build us stress elsewhere on the fault.

[riverrat077]

From the ok geo survey: http://www.okgeosurvey1.gov/

Preliminary Earthquake Report, November 5, 2011

Contacts: Austin Holland or Amie Gibson, Oklahoma Geological Survey, (Email Us)

On November 5, 2011 at 2:12 AM CDT (07:12:45.4 UTC) an earthquake occurred in Lincoln County, Oklahoma. The earthquake occurred about 6 miles northwest of Prague and 5.2 miles southeast of Sparks. The OGS determined a ML magnitude of 4.8 and the USGS currently has it at a magnitude 4.7 (Mb) these two numbers are essentially the same given the errors in calculating magnitude. Both the USGS and the OGS have determined a magnitude 5.2 mbLg for this event. This earthquake occurred very close to where a magnitude 4.3 earthquake occurred on February 27, 2010. From the location of the earthquake and the focal mechanism it is most likely that this earthquake occurred on the Wilzetta fault also known as the Seminole uplift. As of 3:30 AM CDT on 11/5/11 the OGS has received a few hundred reports.

We will be updating this page as we get more information so please check back.