Magnitude 6.9 - GULF OF CALIFORNIA

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2009 August 03 17:59:56 UTC

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Earthquake Details

  • This event has been reviewed by a seismologist.
Location29.066°N, 112.871°W
Depth10 km (6.2 miles) set by location program
  • 137 km (85 miles) W (280°) from La Doce, Sonora, Mexico
  • 174 km (108 miles) NE (46°) from Guerrero Negro, Baja California Sur, Mexico
  • 185 km (115 miles) W (270°) from Hermosillo, Sonora, Mexico
  • 553 km (343 miles) SE (133°) from Tijuana, Baja California, Mexico
Location Uncertaintyhorizontal +/- 7.1 km (4.4 miles); depth fixed by location program
ParametersNST=140, Nph=140, Dmin=411.8 km, Rmss=1.31 sec, Gp= 97°,
M-type=teleseismic moment magnitude (Mw), Version=7
Event IDus2009jwbh
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Earthquake Summary

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Tectonic Summary

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The Gulf of California earthquakes of August 3, 2009, occurred in the plate boundary region between the North America and Pacific plate. At the latitude of the earthquake, the Pacific plate moves northwest with respect to the North America plate at about 45 mm/y. The plate boundary beneath the Gulf consists of a series of transform faults separated by small spreading centers or pull-apart basins: earthquakes occur as the result of strike-slip faulting and normal faulting. The seismographically recorded radiation pattern of the main shock of August 3, 18:00 UTC, implies that the shock occurred as the result of strike-slip faulting, but the earthquake has not yet been associated with a specific geologically mapped fault. The largest historically recorded shocks from the Gulf of California have had magnitudes of about 7.

Earthquake Information for Mexico