Constraints on the size, overpressure, and volatile content of the Mount St. Helens magma system from geodetic and dome-growth measurements during the 2004-2006+ eruption

During the ongoing eruption at Mount St. Helens, Washington, lava has extruded continuously at a rate that decreased
from ~7-9 m³
/s in October 2004 to 1-2 m³
/s by December
2005. The volume loss in the magma reservoir estimated from
the geodetic data, 1.6-2.7×10
⁷
m3
, is only a few tens of percent
of the 7.5×10
7
m³
volume that had erupted by the end of 2005.