How do we "account" for a volcano's magma budget?

How do we "account" for a volcano's magma budget?...

Detailed Description

Shaded relief map of Kīlauea's East Rift Zone in the vicinity of the Pu‘u ‘Ō‘ō eruption site. Colors show changes in elevation that occurred due to emplacement of a lava flow at the base of Pu‘u ‘Ō‘ō during August 3-15, 2011. Parts of this flow were over 20 m (60 ft) thick. The topographic change was measured by a satellite system that orbits Earth and acquires images every 11 days.

Details

Image Dimensions: 2098 x 1591

Date Taken: