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Magnitude 6.9 Quake Strikes Gulf of California

Posted by feww on August 3, 2009

Details of April 4, 2010 quake in BAJA posted at

M7.3 Quake Hits Baja

A powerful earthquake measuring 6.9Mw and strong fore- and aftershocks rock Baja, California

A strong earthquake measuring 6.9Mw struck Gulf of California Monday, August 03, 2009 at 17:59:56 UTC, USGS reported.

The M6.9 mainshock was preceded by a 5.8Mw foreshock and followed by two aftershocks measuring 5.0 and 5.9Mw.

More aftershocks are almost certain to follow.

AP reported:

Phoenix Fire Department spokesman Alex Rangel said a high-rise near downtown shook violently enough that workers evacuated, but there were no reports of injuries or damage. The quake was centered about 460 miles (740 kilometers) from Phoenix.

Earthquake Details [Mainshock]

  • Magnitude: 6.9
  • Date-Time:
    • Monday, August 03, 2009 at 17:59:56 UTC
    • Monday, August 03, 2009 at 10:59:56 AM at epicenter
  • Location: 29.066°N, 112.871°W
  • Depth: 10 km (6.2 miles) set by location program
  • Distances
    • 89 km (56 miles) NNE (31°) from Santa Isabel, Baja California, Mexico
    • 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 Uncertainty: horizontal +/- 7.1 km (4.4 miles); depth fixed by location program
  • Parameters:  NST=140, Nph=140, Dmin=411.8 km, Rmss=1.31 sec, Gp= 97°, M-type=teleseismic moment magnitude (Mw), Version=7
  • Source: USGS NEIC (WDCS-D)
  • Event ID:  us2009jwbh

10-degree Map Centered at 30°N,115°W

us2009jwbh Gulf of Calif
Earthquake Location Map. USGS

Seismic Hazard Map

us2009jwbh Gulf of Calif  Seismic Hazard Map
Major Tectonic Boundaries: Subduction Zones -purple, Ridges -red and Transform Faults -green. USGS

Historic Seismicity us2009jwbh
Major Tectonic Boundaries: Subduction Zones -purple, Ridges -red and Transform Faults -green. USGS

Related Links:

Posted in Earthquakes, La Doce Sonora, Seismic Hazard, Seismic report | Tagged: , , , , | 5 Comments »