Answer :
Earthquakes of magnitude 6.0 or higher triggered mass movements
Gravity acts downward on a flat surface parallel to the Earth's surface.
Earthquakes of magnitude 6.0 or higher triggered mass movements such as lateral earth propagation, boulder fall, debris tumbles, desert boils, sand fluidization, fissures, and settlement. Lateral rock spread, on the other hand, requires a higher seismic magnitude to occur. Gravity is the primary driving force behind mass movement. Gravity is a force that acts on everything on the Earth's surface, pulling everything in the direction of the Earth's center.
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