Kenneth M. Cruikshank
Photographs from 1992 Landers Earthquake

View North along a portion of the 'main' rupture. The person in the distance is at the point of maximum displacement. Note the regular pattern in the rupture

Aerial view of the ares shown in the first slide.

Close up of a single rupture surface in the fault zone. The striations are the close to the displacement direction.

The motion here was close to horizontal. It appears as a vertical offset, but this is not the case. What happened was a ridge crest was offset, giving a vertical scarp.

Sequence of fracrures with a right-lateral displacement (that is why you have the uplifted area where the fractures step to the left.

A rock that was thrown up in the air and landed upside down. Some investigators used such rocks to look at the vertical acceleration in the epicentral region.

Another right-lateral zone. Note that the fractures running from lower left to upper right have a left-lateral displacement.

Another view along a rupture zone. Note the regularity.

Another view along a rupture zone. Note the regularity.

A large scarp. Again this was largely horizontal offset of an existing topographic feature, not vertical offset.

Offset fence in the town of Landers. Note that it is not a simple break.

Offset fence in the town of Landers. Note that it is not a simple break.

Details of a crack with right lateral motion (this is how the 'cavity' is formed). (Slide ID: 1992-13-20)

Lost another field assistant in a crack.

Offset road. Notice that one of the metal pylons has been replaced by a temporary wooden poles. The ground rupture when through the base of the pylon.

Offset road in Landers. New regulations required that the new section of the road have appropriate road markings!

The 'Happy Trail' fault zone. Fracture pattern within a smaller right-lateral fault zone

Fracture pattern within a smaller right-lateral fault zone. Notice than may of the fracures within the zone have left-lateral displacements.

Fracture pattern within a smaller right-lateral fault zone. Notice than may of the fracures within the zone have left-lateral displacements.

Left-Lateral displacement on a fracture in the Happy Trail zone

(Slide ID: 1992-15-27)

More of the Happy Trail zone

Aerial view of some of the rupture zone. Looking South to the area shown in the beginning of this slide set.

Aerial view of some of the rupture zone. Notice the width of the zone, and the en-echelon pattern of teh rupture.

Aerial view of some of the rupture zone. Notice the width of the zone, and the en-echelon pattern of the rupture.

Aerial view of some of the rupture zone. Looking NE to the area shown in the beginning of this slide set.

Rupture going along the base of a hill. The hill was tilted during the earthquake.

Offset of the powerline road. Notice that one of the metal pylons has been replaced by a temporary wooden poles. The ground rupture when through the base of the pylon.