What does the presence of grabens and horsts indicate?

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Grabens and horsts are features commonly found in areas undergoing rift activity, where the Earth's crust is being pulled apart and creating a new divergent boundary. As the crust stretches and thins, it may form a series of parallel grabens (down-dropped blocks) separated by horsts (uplifted blocks). This process is often associated with volcanism, as magma may rise to the surface along the new boundary, but the presence of graben and horst structures specifically point to rift activity.

What Does the Presence of Grabens and Horsts Indicate