Hazards and Disasters


How many really big earthquakes occur each year?

On average, there are about 100 earthquakes of magnitude 6.0–6.9, about 20 of magnitude 7.0–7.9, and two huge 8.0–8.9 earthquakes each year. Many of these really big earthquakes occur in the ocean, so we don’t hear much about them.


This is a web preview of the "The Handy Geography Answer Book" app. Many features only work on your mobile device. If you like what you see, we hope you will consider buying. Get the App