We'd probably have some idea the race is on. Telltale signs like earthquakes, changes in caldera elevation, volcanic gas emissions and temperature changes would

We'd probably have some idea the race is on. Telltale signs like earthquakes, changes in caldera elevation, volcanic gas emissions and temperature changes would offer advance warning. Here's the weekly report for the world's largest active volcano: https://volcanoes.usgs.gov/volcanoes/mauna_loa/elevated.html https://volcanoes.usgs.gov/volcanoes/mauna_loa/elevated.html