What happens below Earth’s surface when the most powerful earthquakes occur

At 03:34 local time on 27 February 2010, Chile was struck by one of the most powerful earthquakes in a century. The shock triggered a tsunami, which devastated coastal communities. The combined events killed more than 500 people. So powerful was the shaking that, by one NASA estimate, it shifted Earth’s axis of spin by a full 8 … Read more

The ‘slow earthquakes’ that we cannot feel may help protect against the devastating ones

Unlike regular earthquakes, which can cause visible damage, slow earthquakes cannot be felt at the Earth's surface. Image credit - Pixabay/ marcellomigliosi1956, licensed under pixabay license

Earthquakes are sudden and their shaking can be devastating. But about 20 years ago, a new type of earthquake was discovered. We cannot feel them, and geologists still know very little about them, such as how often they occur. Regular earthquakes occur when rock underground breaks along a fault – a crack in the Earth’s … Read more