1123_SuppFigS2.pdf (14.2 MB)

Supplemental material: Paleoseismologic evidence for large-magnitude (Mw 7.5–8.0) earthquakes on the Ventura blind thrust fault: Implications for multifault ruptures in the Transverse Ranges of southern California

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journal contribution
posted on 15.09.2015 by Lee J. McAuliffe, James F. Dolan, Edward J. Rhodes, Judith Hubbard, John H. Shaw, Thomas L. Pratt
Geosphere, October 2015, v. 11, p. 1629-1650, doi:10.1130/GES01123.1, Supplemental Figure S2 - High-resolution seismic-reflection profile collected along Day Road. The seismic profile shows weak, south-dipping reflectors on the northern part of the profile and flat strata toward the south. The boundary between these dip domains defines the synclinal axial surface associated with the underlying blind Ventura fault (black dashed line), which reaches the ground surface around distance mark 2600 m. Upper image shows local topography (5× vertical exaggeration) and locations of continuously cored boreholes (green) and CPTs (pink). Bottom image has arrows highlighting the south-dipping reflectors that dominate the north part of the profile, and the flat reflector segments dominating the south part of the profile. Although the strata are relatively poorly imaged, the location of the synclinal axial surface can be constrained to a relatively narrow location. Figure is modified from McAuliffe (2014). File size is ~14 MB.