Magnitude 7.3 – 9km WNW of San Agustin, Colombia – September 30, 2012

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Because this was a deep earthquake (168 km deep), its seismogram was different from what we usually record for shallow earthquakes.

Below is a comparison between the seismogram of this deep earthquake vs. that of a shallow (35 km) earthquake that occurred in Costa Rica earlier in September >>

The biggest difference is that the surface waves from the deep earthquake are much lower amplitude than those of the shallow earthquake.

Note: The deepest known earthquakes occur at about 700 km below the surface of the Earth. These earthquakes do not produce strong tsunamis, and even if they are very large, the ground shaking felt at the surface is not very strong.

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

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