About 47% of big earthquakes occur within 100 miles of a convergent plate boundary, which are more powerful and occur along major fault lines. Earthquakes with a magnitude of 7.0 or greater are associated with transform fault boundaries and run along plate boundaries. 71% of big earthquakes occur within 200 miles of a convergent plate boundary. Seismologists are using satellites to detect small electrical charges from rock strain to better predict earthquakes.