asthenosphere.
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They can start anywhere in the crust, some are just below the surface, some are 60 miles down at the boundary between the crust and mantle, some subduction zone earthquakes can originate as deep as 415 miles down in the subducted crustal plate as it sinks into the mantle.
Earthquakes occur along fault lines and the edges of tectonic plates. These are areas where the earth's plates move against each other. When they slide past each other, earthquakes occur.
several thousand
they are formed along the crustal movements of the earth.
The layer of the earth in liquid form is the mantle. It is made up of magma and lies directly beneath the earth's crust. This liquid is responsible for moving continents and earthquakes. It is the thickest layer of the earth.
The lithosphere is where earthquakes occur.