- journal_title：Geology
- Contributor：Nicholas W. Hayman ; Jeffrey R. Knott ; Darrel S. Cowan ; Eliza Nemser ; Andrei M. Sarna-Wojcicki
- Publisher：Geological Society of America
- Date：2003-
- Format：text/html
- Language：en
- Identifier：10.1130/0091-7613(2003)031<0343:QLASOD>2.0.CO;2
- journal_abbrev：Geology
- issn：0091-7613
- volume：31
- issue：4
- firstpage：343
Detachment faults on the west flank of the Black Mountains (Nevada and California) dip 29°–36° and cut subhorizontal layers of the 0.77 Ma Bishop ash. Steeply dipping normal faults confined to the hanging walls of the detachments offset layers of the 0.64 Ma Lava Creek B tephra and the base of 0.12–0.18 Ma Lake Manly gravel. These faults sole into and do not cut the low-angle detachments. Therefore the detachments accrued any measurable slip across the kinematically linked hanging-wall faults. An analysis of the orientations of hundreds of the hanging-wall faults shows that extension occurred at modest slip rates (<1 mm/yr) under a steep to vertically oriented maximum principal stress. The Black Mountain detachments are appropriately described as the basal detachments of near-critical Coulomb wedges. We infer that the formation of late Pleistocene and Holocene range-front fault scarps accompanied seismogenic slip on the detachments.