Additional information collected about the earthquake may also prompt U.S.G.S. scientists to update the shake-severity map.

Volcanoes and earthquake activity often occur in similar places in narrow zones of activity ... of Fire can be clearly seen on the map. Over 450 of the world’s active and dormant volcanoes ...

Additional information collected about the earthquake may also prompt U.S.G.S. scientists to update the shake-severity map. An aftershock is usually a smaller earthquake that follows a larger one ...