Earthquakes

An earthquake is the sudden release of energy in the Earth's crust, caused by the movement of tectonic plates.

The epicenter is the point on the Earth's surface directly above the earthquake's focus, where the seismic waves are strongest.

The hypocenter is the point within the Earth's crust where an earthquake starts, where the rupture of rocks occurs.

Magnitude is the measure of the strength of an earthquake at its source, based on the amplitude of seismic waves.

Intensity is the measure of the shaking caused by an earthquake at a particular location, based on observed effects.

P-waves are the fastest and cause the most damage because they are longitudinal waves that can travel through solids, liquids, and gases.

S-waves are slower but cause less damage because they are transverse waves that can only travel through solids.

Surface waves travel along the Earth's surface and cause the most shaking because they have the longest wavelengths.

Love waves travel along the Earth's surface and cause side-to-side shaking because they are transverse waves that can only travel through solids.

The Richter scale is used to measure the magnitude of an earthquake, which is a measure of the strength of an earthquake at its source.

The Mercalli scale is used to measure the intensity of an earthquake, which is a measure of the shaking caused by an earthquake at a particular location.

The most common cause of earthquakes is the movement of tectonic plates, which can cause sudden releases of energy.

The three main types of tectonic plate boundaries are convergent, divergent, and transform.

Convergence is the process by which two tectonic plates move towards each other.

Divergence is the process by which two tectonic plates move away from each other.