Full Title: Fractures along a Portion of the Emerson Fault Zone Related to the 1992 Landers, California, Earthquake: Evidence for the Galway Lake Road Rotated Block
Compilers: Robert W. Fleming, James A. Messerich, and Kenneth M. Cruikshank
Buy the digital version (not available in print)
One color sheet, 53" X 25.5". From text: Part of the surface rupturing associated with the 1992 Landers, California, earthquake that occurred along the Emerson fault zone was mapped from stereo pairs of aerial photographs. The principal structure on this part of the fault zone is the Galway Lake Road rotated block, which is a 3- by 1-km oblate structure bounded on all sides by right-lateral, strike-slip fault motion; the circumscribed block rotated counterclockwise. Strike-slip displacement across the throughgoing part of the fault on the southwest side of the block was 5-6 m. Displacement of the northeast side of the block was about 1 m. Throughgoing displacement on the Emerson fault zone is therefore 4-5 m, and is consistent with reported displacement of 3-4 m farther northwest and 3.7-4.5 m farther southeast. The amount of rotation of the circumscribed block was equivalent to the displacement on the northeast side and was about 1 m.
Published: 8/01/1997
Pages: 19 plus 1 sheet
Product Category: Maps and Charts