43 years ago, the biggest earthquake in Idaho’s history shook the state’s tallest mountain

43 years ago, the biggest earthquake in Idaho’s history shook the state’s tallest mountain

43 years ago this month, the biggest earthquake in Idaho’s history shook the Gem State. Around 8 a.m. on October 28th, 1983, an earthquake that originated beneath Idaho’s tallest mountain rocked the towns of Challis and Mackay in central Idaho. The magnitude 6.9 earthquake became known as the Borah Peak Earthquake. “The quake originated along the