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

Analyses of their content and geographic distribution can be a useful supplement ... summarizes, and maps earthquake tweets to provide a rapid overview of what people had experienced.

Volcanoes and earthquake activity often occur in similar places in narrow zones of activity, as shown on the map. These zones include: the Pacific Ring of Fire around the Pacific Ocean the Mid ...