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earthquake click to hear : earthquake

Sudden tremor in a region of the Earth’s crust caused by one rock mass sliding against another.
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See earthquake in : french | spanish
focus seismic wave Earth’s crust isoseismal line epicenter depth of focus fault

focus click to hear : focus

Point in the Earth’s crust where an earthquake is triggered. Also called the hypocenter.

seismic wave click to hear : seismic wave

Vibrations generated at the focus that disperse in all directions, causing shaking of the Earth’s surface.

Earth’s crust click to hear : Earth’s crust

Solid layer at the Earth’s surface whose thickness varies from 10 km beneath the oceans to 60 km beneath the mountains.

isoseismal line click to hear : isoseismal line

Curved line connecting the points on the Earth’s surface that have been subject to tremors of the same intensity.

epicenter click to hear : epicenter

Point on the Earth’s surface located directly over the focus, where the most violent tremors are felt.

depth of focus click to hear : depth of focus

Distance between the focus and the epicenter; it can reach 700 km.

fault click to hear : fault

Fracture in the Earth’s crust separating two blocks that slide against one another during an earthquake.