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Earthquakes are a sudden and violent shaking of the ground as a result of movements within the earth's crust or volcanic action. Earthquakes can cause great destruction.

When an earthquake occurs, it transmits seismic waves in all directions through the earth. These seismic waves can be detected using a special machine called a seismograph.

DBG Seismology - A Brief Introduction

Strongest Earthquakes Cought on Camera

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