Why is a volcano in Bolivia getting bigger and more powerful so FAST?

The Huffington Post quotes researcher Andrea Mustain as saying that a 43 mile wide volcano called Uturuncu is "inflating with astonishing speed." They quote volcanologist Shan de Silva as saying that Uturuncu is "one of the fastest uplifting volcanic areas on Earth."

At the rate it’s expanding, the magma underneath is increasing by 27 cubic feet every SECOND. Bolivia is not a large country: Once it explodes, will there be much of left? But this may not happen soon–volcanoes in the region hoard their magma for around 300,000 years before they erupt, and Uturuncu last erupted around 300,000 years ago.
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