4. Why do so many of the earthquakes happen 33 Km down?
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When the USGS National Earthquake Information Center
locates an earthquake we can always figure out what the
location (latitude and longitude) of the quake are. However,
often we can not determine the depth of the earthquake.
In those cases we assign the depth to be 33 km. In reality
few earthquakes occur at 33 km depth, so some of these events
are actually shallower and some are deeper.
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