The earthquake, centered off the coast of Portsmouth, was felt hundreds of miles away from the epicenter. Dozens take oath of US citizenship against Trump's promise of mass deportations The ...

Read more: ‘Like a truck hit the building’: We visited the coastal Maine town at earthquake epicenter Although tremors could be felt as far as Worcester and Springfield, an interactive map ...

You have just figured out how far your seismograph is from the epicenter and how strong the earthquake was, but you still don't know exactly where the earthquake occurred. This is where the compass, ...