California State University, Northridge parking structure that partially collapsed during the 1994 earthquake. Scientists believe it was the lack of shear walls, being precast, and lack of extra steel reinforcements in vertical columns that led to the damage seen here. This is 5km northeast of the epicenter. P.W. Weigand.
At the head of Lituya Bay in August 1958 a large rockslide plunged into Gilbert Inlet at lower right corner, shearing off part of the front of Lituya Glacier and causing water to surge over the spur opposite. The trimlines slope down to right, across scars of slides that occurred before the 1958 earthquake.
Map indicating movements of earthquake fault zones in Southern California's eastern Mojave Desert. Faults include the Blackwater Little Lake and Garlock Faults of the Eastern California shear zone. Stain accumulation and stress transfer between these faults produces earthquakes.
Crenulated cleavage in a rock, penny for scale. Crenulations refer to small-scale folding that is superimposed on larger-scale folding. Crenulations may occur along the cleaveage planes of deformed rocks.