Normal faults are typically found at divergent plate boundaries, such as mid-ocean ridges or continental rift zones. Reverse faults, in contrast, form in regions where the crust is being compressed.

“This is a normal, natural phenomenon for ... Northern Illinois is far from any plate boundary and free of significant active faults — just the opposite of southern Illinois.

The team found that both sedimentary formations above and below the plate boundary fault lie in the stress state of normal faults in which vertical stress is greater than maximum horizontal stress.

Oceanic transform faults have historically been thought of as simple, predictable features. They represent the least well-studied of the three major plate boundaries, which include divergent ...

It's a seismically active normal fault, which means it is a fracture in Earth's crust that has moved many times in the past. "Normal faults are observed along different tectonic systems ...