This fault scarp shows a dip-slip movement of 5.5 to 6.0 m. Since the earth above the fracture moved down in respect to the earth below the fracture, the fault is known as a normal fault. Such faults result from extension or stretching of the rock layers. Maximum vertical displacement was 6.4 m observed near Red Canyon Creek. Considerable cracking and shifting of roadways, and the destruction of much timber, caused damage exceeding $11 million. In Yellowstone National Park new geysers started erupting, and large steaming cracks, resulting from massive slumping, were observed after the quake.

Image Credit: NOAA National Geophysical Data Center