The shaking started March 31. That’s when the Sawtooth mountain range in central Idaho trembled with a 6.5-magnitude earthquake — the second strongest ever recorded in Idaho. From that very moment, geologists rushed to the epicenter area — 45 miles west of Challis — to start collecting valuable information that could help them understand what happened. Three months later, the rumbling still hasn’t subsided as aftershocks continue to jar the area. But now scientists have a better idea of what may have led to the major earthquake — and it’s helping them uncover some other secrets buried under Idaho’s soil....