Thursday, March 12, 2015

M7.1 - Northern Mid-Atlantic Ridge

Event Location

Data Source US3
Map showing extent (w,s,e,n) = (-36.883700000000005, 47.6354, -26.8837, 57.6354)
52.635°N 31.884°W depth=16.4 kmView interactive map

Event Time

  1. 2015-02-13 18:59:12 (UTC)
  2. 2015-02-13 14:59:12 (UTC-04:00) in your timezone
  3. Times in other timezones

Nearby Cities

  1. 1170km (727mi) SE of Nanortalik, Greenland
  2. 1396km (867mi) SSW of Hafnarfjordur, Iceland
  3. 1401km (871mi) SSW of Kopavogur, Iceland
  4. 1404km (872mi) SSW of Reykjavik, Iceland
  5. 1502km (933mi) W of Tralee, Ireland

Tectonic Summary

The February 13, 2015 M 7.1 Northern Mid-Atlantic Ridge earthquake occurred as the result of right-lateral strike-slip faulting on or near a transform fault forming part of the North America:Eurasia plate boundary.  At the latitude of this earthquake, the North America plate moves approximately westward at a rate of 21 mm/yr with respect to Eurasia. The preliminary location and mechanism of the earthquake are consistent with its occurrence on the Charlie-Gibbs Transform (the seismically active section of the Charlie-Gibbs Fracture Zone), though more detailed analyses of the event will be required to definitively determine the causative structure.

Moderate-to-large earthquakes in this region of the north Atlantic are not uncommon – over the past century, five other earthquakes of M 6.3-7.0 have occurred within 250 km of the February 13, 2015 event, likely along the same fracture zone. The largest of these was a M 7.0 event on the same day in 1967, 48 years before today’s M 7.1 earthquake. Because of their strike-slip mechanisms and locations in the remote north Atlantic, none of these historic events are known to have caused damage. 


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