Some scientists think that Earth’s crust may give hints before it ruptures, in the form of electromagnetic anomalies in the ground and atmosphere that occur minutes to days before an earthquake.
Kosuke Heki, a geophysicist at Hokkaido University, first got interested in the subject when he spotted an increase in the total electron content of the ionosphere above Tohoku about 40 minutes before the magnitude 9.0 earthquake struck in 2011.
In 2011 ... Read even more
