2013 Oklahoma Earthquake Discussion

[venture]

From OGS on the two quakes today...

DATE TIME (UTC) Lat. Long. Depth km Magnitude

21 Mar 2013 15:56 41 L 35.466 -97.393 5.0F 3.3LOGS
21 Mar 2013 16:34 35 L 35.467 -97.396 5.0F 3.2LOGS

[Lauri101]

They may be relatively light in magnitude, but our house is showing the strain. Small cracks opening in plaster and doors won't latch right. Thinking it's time to add earthquake coverage to insurance policy!

[Jim Kyle]

They may be relatively light in magnitude, but our house is showing the strain. Small cracks opening in plaster and doors won't latch right. Thinking it's time to add earthquake coverage to insurance policy!

That's more likely due to the drouth conditions causing settling of the ground beneath the house. Our house is showing the same symptoms although we're in far northwest OKC and have not felt any tremors since the 5.6 one months ago. And the door symptoms vary, day to day, depending on temperature and humidity!

[venture]

Local Time Latitude Longitude Depth (km) Magnitude
2013-04-05 10:15:47.173999 CDT 34.705 +/- 8.1 -98.403 +/- 6.4 8.3 +/- 13.2 2.5 ML OGS
2013-04-05 07:52:24.231000 CDT 35.529 +/- 2.5 -97.120 +/- 2.4 5.0 +/- 0.0 2.5 ML OGS
2013-04-03 19:32:36.746999 CDT 34.924 +/- 9.5 -95.959 +/- 6.7 5.0 +/- 0.0 2.8 ML OGS
2013-04-03 02:37:09.477000 CDT 35.544 +/- 3.9 -96.771 +/- 2.7 5.0 +/- 0.0 1.8 ML OGS
2013-04-03 00:39:03.458000 CDT 35.510 +/- 7.3 -96.749 +/- 6.2 5.0 +/- 0.0 1.3 ML OGS

[silvergrove]

Big one, my hands are a little shaky still.

[venture]

I was wanting to go sleep. Waiting for it to pop up on OGS.

[OKCisOK4me]

Just had an awesome shake over at NW 122nd & MacArthur! Lasted for a good 15 seconds! My heart was beating fast with that shake rattle and roll!!

[Achilleslastand]

Ditto for here in the nw okc area.........the pups went bonkers!

[Ginkasa]

Felt it in Moore. It was quick, though.

[adaniel]

Wow that was huge! Woke me up from a dead sleep.

Felt like someone drove into my apartment building. One good, jarring shake followed by some rattling.

[Praedura]

Yikes. The earth just quaked. How big was that one? Must have been at least a 4.0.

[redrunner]

The jolt woke me up but the rest of the shake was pretty tamed.

[dmoor82]

Wow, pretty decent shaking over here on NW 10th an Meridian, I lived on the 18th floor at the Regency in dt OKC during the 5.6 quake,and that one made the tower sway and could barely stand.Whats the magnitude of this one?

[venture]

Im guessing 4.3-4.5 on that one based on past experience.

Still waiting for it here: http://www.okgeosurvey1.gov/pages/home.php

[KayneMo]

Felt it here in Norman, scared me...

[venture]

Parameter	Value	Uncertainty
Magnitude	3.0 mb_Lg	± 0.08
Location	35.677°N, 96.940°W	± 18.7 km
Depth	4.9 km	± 3.1 km
Number of Stations Used	23
Number of Phases Used	26
Minimum Distance	26.7 km (0.24°)
Travel Time Residual	0.92 sec
Azimuthal Gap	102°
Review Status	REVIEWED
Event ID	usb000g7s0

http://earthquake.usgs.gov/earthquak...00g7s0#summary

[Snowman]

From my house it first just sounded like a strong wind, it took a second to realize there was ground movement

[venture]

Not buying the initial 3.0 estimate. Never have felt a 3.0 unless this thing was shallow.

[silvergrove]

Not buying the initial 3.0 estimate. Never have felt a 3.0 unless this thing was shallow.

Agreed, my house groaned a little too.

[s00nr1]

Considering the wide area this was felt (here in Moore all the way to waking my sister up in Tulsa) I am also very surprised by the 3.0 estimate.

[RadicalModerate]

Here's The REAL Scoop: http://www.okctalk.com/current-event...arthquake.html

[venture]

Updated my previous post with the "felt it" map.

[venture]

Apparently there were two.



Preferred Location Parameters

Parameter	Value	Uncertainty
Magnitude	4.3 mb_Lg	± 0.07
Location	35.685°N, 97.066°W	± 8.0 km
Depth	5.0 km	± 3.0 km
Number of Stations Used	58
Number of Phases Used	68
Minimum Distance	18.9 km (0.17°)
Travel Time Residual	0.71 sec
Azimuthal Gap	33°
Review Status	REVIEWED
Event ID	usb000g7s8

http://earthquake.usgs.gov/earthquak...00g7s8#summary

[RadicalModerate]

From my house it first just sounded like a strong wind, it took a second to realize there was ground movement

Exactly what I thought.
If I'd been down in a tornado shelter it would probably have been extra "scary" . . .

[Snowman]

Considering the wide area this was felt (here in Moore all the way to waking my sister up in Tulsa) I am also very surprised by the 3.0 estimate.

They are now listing a 4.3 and a 3.0 roughly eleven minutes apart