The Mount Meager massif is the most unstable volcanic massif in Canada. It has dumped clay and rock several meters deep into the Pemberton Valley at least three times during the past 7,300 years. Recent drilling into the Pemberton Valley bed encountered remnants of a debris flow that had traveled from the volcano shortly before it last erupted 2,350 years ago. About of rock and sand extended over the width of the valley. Two previous debris flows, about 4,450 and 7,300 years ago, sent debris at least from the volcano. Recently, the volcano has created smaller landslides about every ten years, including one in 1975 that killed four geologists near Meager Creek. The possibility of the Mount Meager massif covering stable sections of the Pemberton Valley in a debris flow is estimated at about one in 2,400 years. There is no sign of volcanic activity with these events. However scientists warn the volcano could release another massive debris flow over populated areas any time without warning.