a smaller earthquake that occurs after a larger earthquake.
a type of stress that squeezes rock, causing it to break or fold.
movement of the ground caused by the release of energy from a sudden shift of rocks in Earth's crust.
the outer layer of the earth.
the point on Earth's surface directly above the focus of an earthquake.
a break in Earth's crust where movement of rock occurs.
the measurement of the total strength or amount of energy released by an earthquake.
a type of stress that pushes two adjacent areas of rock in opposite directions.
a force that causes rock to change shape.
a type of stress that stretches rock and makes it thinner.