Service Areas
Representative Experience - Seismic Hazard Assessment
Transtensional Model for the Sierra Nevada Frontal Fault System, Eastern California, USA
Oblique Mercator projection of the western Cordillera about the preferred Sierra Nevada—North American Euler pole of Argus and Gordon (2001). The direction of instantaneous Sierra Nevada—North American motion is vertical everywhere in the projection. Strike-slip faults of the Walker Lane belt are subparallel to Sierra Nevada—North American motion; normal faults strike ~45° clockwise of that motion; and major graben and zones of extension are located in areas where the locus of deformation along the eastern Sierra steps eastward in a releasing geometry (Quaternary faults modified from Jennings, 1994). MTJ Mendocino triple junction; SEGP subducted southern edge of the Gorda plate; CB Cape Blanco; ICF Inks Creek fold belt; HC Hat Creek graben; A Lake Almanor structural basin; MV Mohawk Valley; HL Honey Lake fault; T Lake Tahoe basin; C Carson Valley; LV Long Valley; SNFFS Sierra Nevada frontal fault system; I Independence fault; OV Owens Valley; IWV Indian Wells Valley; ECSZ Eastern California Shear Zone (Figure 1of Unruh, Humphrey and Barron, 2003).