Dilatometers recorded pressure changes within the Soufrière Hills Volcano's magma chamber during the 13 July 2003 collapse of its� lava dome. Strain data was evaluated to determine the depth of the pressure source. Results suggest an ellipsoidal magma chamber source at a depth of roughly six kilometers and an average radius of about one kilometer. The observed increase in pressure was consistent with the magma containing pressurized bubbles that expanded when the ambient pressure was reduced.
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