M7.0 - Falkland Islands region (BETA) 2013-11-25 06:27:33 UTC

Summary

Location and Magnitude contributed by: USGS National Earthquake Information Center

General


Additional Commentary

The November 25, 2013 M7.0 earthquake (06:27:33 UTC) southwest of the Falkland Islands in the South Atlantic Ocean occurred as the result of strike slip faulting, on either a left-lateral fault striking ENE-WSW, or a right-lateral structure striking NNW-SSE.  The location of the earthquake, near the ENE-WSW trending plate boundary between the South America and Scotia tectonic plates, suggests it is likely associated with left-lateral faulting along this margin. At the location of this earthquake, the Scotia plate moves ENE with respect to South America at a rate of approximately 9.5 mm/yr.

The November 25, 06:27:33 earthquake was the largest of 5 M5+ events that occurred in a similar area over an approximate 2-hour period, including a M5.6 earthquake 24 seconds prior to the M7.0 mainshock. Though this region experiences moderate-sized earthquakes relatively frequently – 15 M5+ events have occurred within 250 km of the November 25 earthquake over the past 40 years – large events are fairly uncommon. The largest nearby earthquake over the same time period was a M6.6 event in September 1993, 210 km to the east of the November 25 earthquake. 

ShakeMap

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Scientific

Location and Magnitude contributed by: USGS National Earthquake Information Center

Summary

Preferred Location Parameters

Parameter Value Uncertainty
Magnitude 7.0 mww Not Specified
Location 53.945°S, 55.003°W Not Specified
Depth 11.8 km ± 2.4 km
Number of Stations Used Not Specified
Number of Phases Used 253
Minimum Distance 326.7 km (2.94°)
Travel Time Residual 1.08 sec
Azimuthal Gap 31°
Review Status MANUAL
Event ID usb000l5zn
See the “Contributed Solutions” for a list of all contributed location parameters.

Moment Tensor

Moment Tensor EQXML

Contributed Solutions

Moment Tensor

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