Yes, an earthquake absolutely means there is movement in the Earth's crust.

Here's why:

* Earthquakes are caused by the release of energy: This energy is stored within the Earth's crust due to the constant movement of tectonic plates.

* Tectonic plates move and interact: These plates can collide, slide past each other, or pull apart. This interaction creates stress in the Earth's crust.

* Stress builds up and is released: When the stress exceeds the strength of the rocks, the crust breaks, and the rocks move abruptly. This sudden movement is what we feel as an earthquake.

So, in short, earthquakes are the result of the Earth's crust moving, and the shaking we experience is a direct consequence of that movement.