This series of two lectures summarizes the sequence of events asssociated with the 1980-86 eruptions of Mount St Helens, Washington State, USA. It is intended as a refresher for students and researchers.

Researchers should cite this work as follows:

• William I Rose (2011), "Mount St Helens 1980-6 Activity summary," https://theghub.org/resources/629.

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1. deformation
2. plinian eruption
3. pyroclastic density currents
4. volcanic cloud transport
5. volcanic domes