Why are the older volcanoes smaller?

As the amount of magma changes in this underground reservoir, the whole summit of the volcano bulges and shrinks. At the same time, the seismic velocity changes. As the magma chamber fills up, it causes an increase in pressure, which leads to cracks closing in the surrounding rock and producing faster seismic waves.

Eventually, when volcanoes have rafted away from the heat source, they falter and die. As the Earth's crust moved, slowly but surely, over millions of years, the magma that was under old volcanoes in southeast Idaho ended up in Wyoming—under a big super volcano

As the amount of magma changes in this underground reservoir, the whole summit of the volcano bulges and shrinks. At the same time, the seismic velocity changes. As the magma chamber fills up, it causes an increase in pressure, which leads to cracks closing in the surrounding rock and producing faster seismic waves

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