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Observations of microbarograph recordings on the island of Montserrat in the Caribbean have shown signals with periods of several minutes and amplitude of approximately 1 mb following explosive eruptions of the Soufrière Hills Volcano. These properties suggest that the explosions are causing the generation of atmospheric internal waves. Here an analysis of wave generation by sudden disturbances in a stratified atmosphere is developed, and the properties of these waves are described and compared with observations. Two types of forcing of the atmosphere by a volcanic explosion are considered: that due to the sudden addition of mass, and separately, of...

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