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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
  • Region: GULF OF CALIFORNIA
  • 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:

5 Responses to “Magnitude 6.9 Quake Strikes Gulf of California”

  1. City News Local…

    […]Magnitude 6.9 Quake Strikes Gulf of California « Fire Earth[…]…

  2. […] Magnitude 6.9 Quake Strikes Gulf of California […]

  3. feww said

    USGS upgrades largest aftershock to magnitude 6.2 [from 5.9]

    Magnitude: 6.2
    Date-Time:
    – Monday, August 03, 2009 at 18:40:50 UTC
    – Monday, August 03, 2009 at 11:40:50 AM at epicenter
    Location: 29.371°N, 113.703°W
    Depth: 10 km (6.2 miles) set by location program
    Region: GULF OF CALIFORNIA
    Distances:
    + 115 km (72 miles) NNW (343°) from Santa Isabel, Baja California, Mexico
    + 160 km (100 miles) NNE (16°) from Guerrero Negro, Baja California Sur, Mexico
    + 211 km (131 miles) SW (225°) from Caborca, Sonora, Mexico
    + 267 km (166 miles) W (278°) from Hermosillo, Sonora, Mexico
    + 473 km (294 miles) SE (137°) from Tijuana, Baja California, Mexico

    Location Uncertainty: horizontal +/- 7.2 km (4.5 miles); depth fixed by location program
    Parameters: NST=145, Nph=145, Dmin=429.4 km, Rmss=1.42 sec, Gp=162°,
    M-type=centroid moment magnitude (Mw), Version=8
    Source: USGS NEIC (WDCS-D)
    Event ID: us2009jwbr

  4. feww said

    6.9 magnitude earthquake in Baja felt in Tucson

    “Well, sometimes we can feel the trains go by, and a couple of people looked out to see if there was a train, and there weren’t any trains going by,” said Karen Campasano, a University of Arizona employee. “Probably a little after 11, I felt a chair move, and I thought it was probably an earthquake of some kind. Then about 15 minutes later we felt it again, and this time I could see the screen on the computer move.”
    http://www.kvoa.com/Global/story.asp?S=10841910&nav=menu216_2

  5. feww said

    The above detailed seismic event may have been more powerful than reported, possibly as large as 7.2Mw.

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