The study of earthquakes is a big part of
plate tectonics. The movement of Earth's tectonic plates can
set off earthquakes in plate boundaries that contain
faults. In the US there are many earthquakes such as long the
West Coast from California to Alaska. These earthquakes result
from tectonic plates grinding past one another.
Most earthquakes occur in narrow zones that
join to form a continous network bounding regions that are
seismically less active such as rift valleys, oceanic ridges,
mountain belts, volcanic chains and deep oceanic renches. When
stresses accumulate to the point that rocks in the earth's
crust break, an earthquake results.
Types of Faults