- journal_title：Geology
- Contributor：Gary J. Axen ; John M. Fletcher ; Eric Cowgill ; Michael Murphy ; Paul Kapp ; Ian MacMillan ; Ernesto Ramos-Velázquez ; Jorge Aranda-Gómez
- Publisher：Geological Society of America
- Date：1999-
- Format：text/html
- Language：en
- Identifier：10.1130/0091-7613(1999)027<0247:RFFSOT>2.3.CO;2
- journal_abbrev：Geology
- issn：0091-7613
- volume：27
- issue：3
- firstpage：247
The Cañada David detachment, a west-dipping low-angle normal fault, juxtaposes Pliocene and Pleistocene(?) sedimentary units over sheared bedrock in the Sierra El Mayor, Baja California. Along the west-central range front, the detachment is overlapped by Quaternary alluvial fans that are, in turn, cut by fault scarps up to 7 m high. Map relationships suggest that scarp-forming faults may sole into the detachment at very shallow depth (<200–300 m). Palinspastic restoration of a topographic profile across 15 north-striking scarps suggests that the ratio of net heave to net throw along scarp-forming faults is ∼2, consistent with them soling into a low-angle (∼30°) fault. These 15 scarps may have all formed in one earthquake, with rupture propagation from depth to the near-surface aided by clay gouge along the detachment. The detachment is abandoned in the footwall east of the scarps.