Home » Special Events » Magnitudes 4.7 & 5.6 earthquakes in Oklahoma

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last updated: 11/07/11 08:36.23 (PST)

On Saturday November 5 2011 at 12:12 AM (PDT) and Saturday November 5 2011 at 8:53 PM (PDT) the USArray seismic network recorded two earthquakes (preliminary magnitudes Mw 4.7 foreshock & Mw 5.6 mainshock) located in Oklahoma.

Initial source parameters for these tremors are indicated below. The epicentral distance (i.e. distance separating the epicenter and the closest station in the recording network, V35A) for the Mw 5.6 main shock and USArray is 26 km (0.24 degrees).

If you felt the quake, the USGS would like to know. Please add your comments to the USGS page "Did you feel it?".


Global map view
Foreshock Solution Parameters
Local Date:Saturday November 5, 2011
Local Time: 12:12 AM PDT
Universal Time:11/05/11 (309) 07:12.45 UTC
Magnitude:4.7 Mw
Depth:4 km
Mainshock Solution Parameters
Local Date:Saturday November 5, 2011
Local Time: 8:53 PM PDT
Universal Time:11/06/11 (310) 03:53.10 UTC
Magnitude:5.6 Mw
Depth:5 km

Proximity to Population Centers (Mw 5.6 Event)

  • 34 km (21 miles) NNE of Shawnee, Oklahoma
  • 63 km (39 miles) SSE of Stillwater, Oklahoma
  • 68 km (42 miles) ESE of Guthrie, Oklahoma
  • 71 km (44 miles) ENE of Oklahoma City, Oklahoma


Mercator projection regional view

The red star denotes the earthquake epicenter. Triangle symbols are active stations at the time of the earthquake in the USArray (excluding ANSS backbone stations and GSN stations, which are represented by a diamond symbol) and colored by network. Blue lines are major rivers. Thin black lines are state boundaries and thick black lines are national boundaries.

Regional map view
Network Legend
 Transportable Array (TA)
 UC San Diego (AZ)
 CalTech (CI)
 Uni. Utah (UU)
 ANSS backbone stations (US)
 Global Seismograph Network (IU)

Regional satellite view

The red markers denote the earthquake epicenters.

Detailed terrain view

The red markers denote the earthquake epicenters.


You may view plots showing the Mw 5.6 event as recorded by USArray instruments:

3 components recorded by V35A, the closest USArray station to the main Mw 5.6 event:

Latest monthly deployment map

Every arrival station waveforms

View waveforms from any station* that recorded arrivals for the Mw 5.6 event by entering the station code below (e.g. 109C) and clicking the 'View waveforms' button:

* – If waveforms are filtered, the filter type is listed on the image

Current seismic activity measured by USArray

Click the link below to observe an interactive map of earthquakes recorded by the USArray deployment:

Further information

Learn more about the Array Network Facility (ANF) component of USArray, the USArray experiment, the EarthScope project, and the Incorporated Research Institutions for Seismology (IRIS).

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