Speakers: Cynthia Gardner, Research Geologist, U.S. Geological Survey
Carolyn Dreidger, Hydrologist/Outreach Coordinator ; The 18 May 1980 eruption of Mount St. Helens awoke the Pacific Northwest to the reality that
Cascade volcanoes erupt with significant consequences to communities downstream and
downwind. What will you need to know when your community‟s backyard volcano showed
signs of unrest? Do you know how you will be alerted? What kind of information you will
receive? What hazards may confront you and for how long? At what point will you be required
to make decisions? What are the sources of uncertainty during volcanic unrest and eruption?
This session is intended as a dialogue between volcano scientists and emergency managers,
infrastructure managers, and the business community. Scientists will present basic information
about Cascade volcanoes, the hazards they pose, timescales of eruptive unrest and activity, the
USGS alert-level system, and uncertainties in forecasting eruptive events.