Figure 4. Field photographs from the BDT19 box excavation at Bidart fan. (a) Oblique overview field photograph showing the majority of the trenchette locations (see Fig.  3 for all locations). (b–f) Pictures of gravel sheet flow consisting of mainly ∼1  cm size pebbles as exposed in the hand‐dug

Figure 4. Field photographs from the BDT19 box excavation at Bidart fan. (a) Oblique overview field photograph showing the majority of the trenchette locations (see Fig.  3 for all locations). (b–f) Pictures of gravel sheet flow consisting of mainly ∼1  cm size pebbles as exposed in the hand‐dug

Figure 1. (A) Hillshade view of the Bidart Fan (Carrizo Plain, California), generated from 0.5 m–grid size light detection and ranging (LiDAR) digital elevation model (DEM). Three ephemeral stream channels, right-laterally displaced as they cross the NW-SE–trending San Andreas fault (SAF) trace

Figure 3. Probability density functions for earthquake (Eqs) ages at Bidart Fan site calculated by OxCal ( Ramsey, 2005 ). Lines below each distribution show limit of 95.4 percentile confidence ranges for these earthquakes. Numbers below lines indicate median age. Inset shows probability density

Figure 4. Layer, earthquake, and recurrence PDFs for the Bidart Fan ( BF ) site. See Figure  3 for an explanation of the features of this figure.

Figure 12. Diagram illustrating probable correlation of Event 2 at Frazier Mountain with similarly dated events at the Bidart Fan, Pallett Creek, and Wrightwood sites. Gray vertical bars represent 2σ age ranges for earthquakes at Bidart fan reported by Grant and Sieh ( 1994 ) and for Pallett

to divide the south‐central SAF into five major sections: Cholame (Ch), Carrizo (Ca), Big Bend (Bb), Mojave north (Mn), and Mojave south (Ms). The locations of paleoseismic sites along the 1857 rupture trace are indicated by numbered red circles: 1, Las Yeguas; 2, Wallace Creek; 3, Phelan Fan; 4, Bidart Fan

Figure 1. Shaded relief map of Southern California showing trace of A.D. 1857 Fort Tejon earthquake rupture (thick black line) and locations of selection of paleoseismic sites including Bidart Fan (white star). LA—Los Angeles; SB—Santa Barbara.

Figure 2. Portion of trench T11 (BDT11) log that shows evidence for last five earthquakes and the earthquake horizon for the sixth earthquake (not observed in this portion of the log) that ruptured Bidart Fan site in Carrizo Plain. Arrows and letters mark earthquake horizons. Colors represent

Figure 1. Location of paleoseismic sites (white rectangles) along the southern San Andreas fault ( SAF ) zone (solid white line). The study area located at the Bidart fan (BF) is marked with a white star. Important locations are indicated with white boxes. Shaded topography is from Shuttle Radar

(1970) as well as locations of Bidart Fan (BF), Phelan Fan (PF), Wallace Creek (WC), and Van Matre Ranch ( vmr ) paleoseismic sites. Polygon at vmr shows the location of aerial photography in Figure 3 .

Figure 4. Probability density functions for the last four earthquake ages at nearby Bidart Fan ( ∼ 12    km to the NW) from Akciz et al. (2010) . Vertical line represents the median postinfrared infrared‐stimulated luminescence (p‐IR IRSL) age for T2 beheaded gully channel deposit

. The excavation sites, from northwest to southeast, are Las Yegas ( LY ), Bidart Fan ( BF ), Frazier Mountain ( FM ), Pallett Creek ( PC ), Wrightwood ( WW ), Pitman Canyon (Pit), Plunge Creek (Plunge), and Mission Creek ( MC ). Landmarks are Parkfield ( PF ), Cholame ( CH ), Carrizo Plain ( CPl ), Tejón Pass

. The excavation sites, shown in yellow italic symbols, are from northwest to southeast: Las Yeguas, LY ; Bidart Fan, BF ; Frazier Mountain, FM ; Pallett Creek, PC ; Wrightwood, WW ; Pitman Canyon, Pit; Plunge Creek, Plunge; and Mission Creek, MC . Landmarks are Parkfield, PF ; Cholame, CH ; Carrizo Plain