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19 December 2011

Update: Magnitude ?? - Augrabies Earthquake 18 December 2011 20h07 SAST


Seismic Hazard Map



Images: USGS (Click on image for larger view.

Information of the earthquake which occurred in the Augrabies area have now been released by the European - Mediterranean Seismological Centre, Geoscience SA and the United States Geological Society.  The SAWDIS original post is listed HERE.

The European - Mediterranean Seismological Centre and United States Geological Society list the magnitude as 4.3 while Geoscience SA reflect a 5.0 recording on the Richter-scale.

European Mediterranean Seismological Centre Details:

Magnitude Mw 4.3
Region SOUTH AFRICA
Date time 2011-12-18 18:07:05.0 UTC
Location 28.68 S ; 20.40 E
Depth 2 km
Distances 426 km W Kimberley (pop 142,089 ; local time 20:07:05.8 2011-12-18)
85 km W Upington (pop 71,373 ; local time 20:07:05.8 2011-12-18)

- EMSC

USGS Earthquake Details

This event has been reviewed by a seismologist.
Magnitude:  4.3
Date-Time: Sunday, December 18, 2011 at 18:07:07 UTC
Sunday, December 18, 2011 at 08:07:07 PM at epicenter
Location: 28.558°S, 20.377°E
Depth: 15.3 km (9.5 miles)
Region: SOUTH AFRICA
Distances:
86 km (53 miles) W of Upington, South Africa
272 km (169 miles) ENE of Springbok, South Africa
623 km (387 miles) NNE of Cape Town, South Africa
867 km (538 miles) WSW of PRETORIA, South Africa
Location Uncertainty:
horizontal +/- 25.6 km (15.9 miles); depth +/- 9.5 km (5.9 miles)
Parameters:
NST= 10, Nph= 10, Dmin=426.4 km, Rmss=1.19 sec, Gp=148°,
M-type=centroid moment magnitude (Mw), Version=3
Source
Magnitude: USGS NEIC (WDCS-D)
Location: USGS NEIC (WDCS-D)
Event ID
usc000780x

- USGS

Seismology Unit of the Council for Geoscience Details

Date and Time: Sunday, 18 December 2011 at 20:07:08.50 SAST
Magnitude: 5.0 (Local)
Depth: 5.0 km (Fixed)
Location: -28.671° South, 20.477° East
Region: Augrabies area, Northern Cape Province

 - Seismology Unit of the Council for Geoscience

SAWDIS:  A special word of thanks to Andrew Hockly who first alerted the SAWDIS of the quake.  A word of thanks to all the other observers who send in reports to the SAWDIS.  Your reports are highly appreciated. Keep up the good work!!