if the magma chamber become empty, what will happen?

Answer 1

What would cause the magma chamber to become empty?

If its a shallow-seated magma chamber and the magma erupts on the surface through a volcano as lava (or other volcanic debris and ejecta), then the volcano would collapse into the now-empty magma chamber, and it would be called a caldera.

Examples are Crater Lake, Oregon and Indian Peak Caldera, near Cedar City, Utah.

If its a deep-seated magma chamber, the only way the magma would leave the chamber is if it was squeezed out by deformation of surrounding rocks, meaning it would never become empty but just displaced.

Answer 2

Yellowstone is being featured in many documentaries these days, because it is a Super Volcano. Beneath it is an enormous magma chamber. Some scientists are concerned that it may erupt in the not too distant future. It has been fascinating to watch the various scenarios that are being presented in these documentaries. One of the common denominators they share is that the eruption would be catastrophic. The magma would be shooting straight up, for many thousand feet. The poisonous ash cloud would make an astray out of around five states, then continue around the Earth. The consequences would be catastrophic.

Answer 3

Wel, it is highly unlikely that the magma chamber becomes empty. In the extreme possibility that it becomes empty, there won't be any more volcanoes.

The absence of magma indicates that the temperatures inside the Earth's core has dropped drastically. I don't know the physical significance of that.