Some earthquake faults in northern Utah could be younger and more active than those previously studied here, according to recent studies by the Utah Geological Survey.

The Wasatch Fault Zone, which runs along the west base of the Wellsville Mountains in Box Elder County, and the East Cache Fault Zone, at the base of the Bear River Mountains, were last active before Lake Bonneville covered most of the state.But the West Cache Fault Zone, which runs along the west side of the Cache Valley at the base of the Wellsvilles, contains faults that are significantly younger. In fact, they may have occurred after Lake Bonneville disappeared, said Utah Geological Survey geologist Bill Black.

Black said his study was unable to determine if a large quake had occurred in the last 9,000 years, which would have suggested a trend in the earth shifts and meant that another quake could hit soon.