Magnitude 6.9 – Gulf of California – August 3, 2009


The BC-ESP recorded the strong earthquake that struck the Gulf of California, Mexico on August 3, 2009. In addition to the magnitude 6.9 main shock, you can also see a magnitude 5.8 foreshock and a magnitude 6.2 aftershock on this seismogram. Notice that, as we would expect from the magnitude scale, the main shock is about 10 times bigger than the foreshock.

For more info on this earthquake, go to US Geological Survey report.


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