Earthquakes are common at volcanoes and help scientists track unrest, but most never lead to an eruption. Learn how they relate and how to read volcano alert levels and aviation color codes.

Why Ring of Fire earthquakes are so common and so large: the subduction zones around the Pacific, where they are, and how risk varies along the belt.

How to check Hawaii earthquakes today using verified USGS and Hawaiian Volcano Observatory data, and why the islands have volcanic and flank quakes.

How to check Alaska earthquakes today with verified USGS and Alaska Earthquake Center data, plus tsunami warnings, volcanoes and past great quakes.

A clear guide to the types of earthquakes: strike-slip, normal and thrust faulting, plus interplate, intraplate, deep, volcanic and induced quakes.

What are tectonic plates? Learn how Earth's rigid outer shell is divided into moving plates, how fast they move and what happens where they meet.