The evolution of fault slip through time may yield insight into the geodynamics of deforming lithosphere. Precise determination of temporal variations in fault slip is often hindered, however, by a dearth of markers of varying age from which to reconstruct fault slip. Here we determine slip rates across the White Mountain Fault Zone over the past ca. 0.8 Ma from displaced alluvial deposits pres...

Cuttings from geothermal wells in Dixie Valley, Nevada document the complex history of the Jurassic reservoir rocks now contained within the hanging wall of the Stillwater normal fault. Six stages of postOligocene alteration can be recognized on the basis of mineral paragenesis, rock associations, fluid-inclusion temperatures and apparent salinities. The paragenetic sequence from oldest to youn...

The Sawtooth Fault in central Idaho, USA, is a range-bounding normal fault with Late Pleistocene–Holocene scarp near the up-valley ends of several range-front lakes. Cores from Redfish Lake, which spans fault, exhibit evidence catastrophic sediment re-mobilization two sequences consisting variably intraclastic mud-clast conglomerate, massive homogenite, and graded silt clay. Event strata younge...

Recent field and geochronological investigations. in conjunction with LITHOPROBE seismic surveys, have led to the recognition of crust&scale, low to moderate-angle, Eocene extensional faults and shear ZOIIL‘S in the southern Omineca Belt. The present study focuses on documentation of the Eagle River fault, an extensional shear zone that delineates the western boundary of the Shuswap metamorphic...

The geothermal potential of West Mesa has historically been assumed to be small because it is thought to be dominated by a left-stepping transpressional regime that is generally tight and not conducive to open fluid pathways. This may not be the complete picture, however. The 85 MWe Heber geothermal project appears to be located in a right stepover from the northwest trending seismogenic extens...

Local earthquake P trave!time data is inverted to obtain a three-dimensional tomographic image of the region centered on the junction of the San Andreas and Calaveras faults. The resulting velocity model is then used to relocate more than 17,000 earthquakes and to produce a model of fault structure in the region. These faults erve as the basis for modeling the topography using elastic dislocati...

Data from 10,126 earthquakes that occurred in the southern California region between 1934 and 1963 have been synthesized in the attempt to understand better their relationship to regional geologic structure, which is here dominated by a system of faults related mainly to the San Andreas system. Most of these faults have been considered "active" from physiographic evidence, but both geologic and...