California State Waters Map Series: Offshore of Coal Oil Point, California

Johnson, Samuel Y.; Dartnell, Peter; Cochrane, Guy R.; Golden, Nadine E.; Phillips, Eleyne L.; Ritchie, Andrew C.; Kvitek, Rikk G.; Dieter, Bryan E.; Conrad, James E.; Lorenson, Thomas D.; Krigsman, Lisa M.; Greene, H. Gary; Endris, Charles A.; Seitz, Gordon G.; Finlayson, David P.; Sliter, Ray W.; Wong, Florence L.; Erdey, Mercedes D.; Gutiérrez, Carlos Ignacio; Leifer, Ira; Yoklavich, Mary M.; Draut, Amy E.; Hart, Patrick E.; Hostettler, Frances D.; Peters, Kenneth E.; Kvenvolden, Keith A.; Rosenbauer, Robert J.; Fong, Grace S.

doi:10.3133/sim3302

Cited by 2 publications

(6 citation statements)

References 68 publications

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“…Many of these profiles are included in Fisher et al (2009b), Johnson et al ( , 2013aJohnson et al ( , 2013bJohnson et al ( , 2013cJohnson et al ( , 2014Johnson et al ( , 2015aJohnson et al ( , 2017bJohnson et al ( , 2017c, Sorlien and Nicholson (2015), and elsewhere. These industry profiles generally have their northern endpoints several kilometers from the shoreline and do not provide comprehensive coverage of the shelf.…”

Section: Data Acquisitionmentioning

confidence: 99%

“…In Johnson et al ( , 2013aJohnson et al ( , 2013bJohnson et al ( , 2013cJohnson et al ( , 2014Johnson et al ( , 2015aJohnson et al ( , 2017bJohnson et al ( , 2017c, high-resolution seismic reflection data were used to map the transgressive surface of erosion and post-LGM sediment thickness at the 1:50,000 scale between Hueneme Canyon and Point Conception ( Johnson et al | Shelf evolution, Santa Barbara Channel GEOSPHERE | Volume 13 | Number 6 using gridding methods described in Wong et al (2012). Sediment thickness maps developed for parts of this area have previously been presented at scales ranging from ~1:235,000 to 1:1,000,000 (e.g., Dahlen et al, 1990;Dahlen, 1992;Slater et al, 2002;Draut et al, 2009;Sommerfield et al, 2009).…”

Section: Sediment Distribution and Thicknessmentioning

confidence: 99%

“…Tables 1 and 2 present sediment thickness and volume data for several discrete areas on the Santa Barbara shelf, discussed herein. -140 --135 -135 --130 -130 --125 -125 --120 -120 --115 -115 --110 -110 --105 -105 --100 -75 --70 -70 --65 -65 --60 -60 --55 -55 --50 -50 --45 -45 --40 -40 --35 -35 --30 -30 --25 -25 --20 -20 --15 -15 --10 Depth Active Structures Mapped on the Santa Barbara Shelf and Upper Slope Figure 2, simplified from the onshore-offshore geologic maps in Johnson et al ( , 2013aJohnson et al ( , 2013bJohnson et al ( , 2013cJohnson et al ( , 2014Johnson et al ( , 2015aJohnson et al ( , 2017bJohnson et al ( , 2017c, shows active faults and folds on the shelf and upper slope. On the shallow seismic reflection data active faults are identified based on the abrupt truncation or warping of post-LGM reflections, and/or juxtaposition of reflection panels with different seismic parameters such as reflection presence, amplitude, frequency, geometry, continuity, and vertical sequence.…”

Section: Sediment Distribution and Thicknessmentioning

confidence: 99%

“…2) is located ~3.6-4.5 km north of the small fold at the tip of the Pitas Point fault, in the fault hanging wall. The axis of the anticline can be traced continuously across the shelf for 45 km from its eastern landfall 800 m south of Punta Gorda to a few kilometers west of Coal Oil Point, where it abruptly stops (Johnson et al, 2013b(Johnson et al, , 2013cConrad et al, 2014), a location coincident with the 25° change in the strike of the underlying Pitas Point fault (Sorlien and Nicholson, 2015). On land to the east, the structure is known as the Ventura Avenue anticline (e.g., Rockwell et al, 1988); in the offshore, the fold is also referred to as the Dos Cuadras anticline east of Santa Barbara, and the South Ellwood anticline west of Santa Barbara.…”

Section: Rincon Anticlinementioning

confidence: 99%

“…There is a significant discontinuity in shelf geologic structure ~4-5 km west of Coal Oil Point (Conrad et al, 2014(Conrad et al, , 2015. Just east of this discontinuity between Santa Barbara and Goleta, 2 shallow seismic reflection profiles spaced 1200 m apart cross 7 shallow fold axes and 3 fault zones over a crossstrike distance of 3.2 km (Fig.…”

Section: West Of Coal Oil Point Structural Discontinuitymentioning

confidence: 99%

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Shelf evolution along a transpressive transform margin, Santa Barbara Channel, California

et al. 2017

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High-resolution bathymetric and seismic reflection data provide new insights for understanding the post-Last Glacial Maximum (LGM, ca. 21 ka) evolution of the ~120-km-long Santa Barbara shelf, located within a transpressive segment of the transform continental margin of western North America. The goal is to determine how rising sea level, sediment supply, and tectonics combine to control shelf geomorphology and history. Morphologic, stratigraphic, and structural data highlight regional variability and support division of the shelf into three domains. Ages and rates of deformation are derived from a local sea-level-rise model that incorporates an inferred LGM shoreline angle and the LGM wavecut platform. Post-LGM slip rates on the offshore Oak Ridge fault are a minimum of 0.7 ± 0.1 mm/yr. Slip rates on the Pitas Point fault system are a minimum of 2.3 ± 0.3 mm/yr near Pitas Point, and decrease to the west across the Santa Barbara Channel. Documentation of fault lengths, slip rates, and rupture modes, as well as potential zones of submarine landsliding, provide essential information for enhanced regional earthquake and tsunami hazard assessment.

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Section: Data Acquisitionmentioning

confidence: 99%

Section: Sediment Distribution and Thicknessmentioning

confidence: 99%

Section: Sediment Distribution and Thicknessmentioning

confidence: 99%

Section: Rincon Anticlinementioning

confidence: 99%

Section: West Of Coal Oil Point Structural Discontinuitymentioning

confidence: 99%

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Shelf evolution along a transpressive transform margin, Santa Barbara Channel, California

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Quaternary chronology and rock uplift recorded by marine terraces, Gaviota coast, Santa Barbara County, California, USA

et al. 2021

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The Transverse Ranges of southern California are a region of active transpression on the western margin of North America that hosts some of the world’s highest uplift rates at the Ventura anticline. Yet, the manner in which rock uplift rates change along strike from Ventura to the westernmost Transverse Ranges and the structures that may be responsible for this uplift remain unclear. Here, we quantified rock uplift rates within the westernmost 60 km of the Transverse Ranges by obtaining new age constraints from raised beach and shoreface deposits from marine terraces along the Gaviota coast. Twelve radiocarbon (seven sites) and eight luminescence (six sites) ages, ranging from ca. 50 to 40 k.y. B.P. and ca. 56 to 43 ka, respectively, consistently suggest that the first emergent terrace dates to marine isotope stage (MIS) 3, rather than MIS 5a as previously reported for the western Gaviota coast. These younger ages yield rock uplift rates between 0.8 ± 0.3 and 1.8 ± 0.4 m/k.y., i.e., over five times higher than previous estimates for this region. The spatial distribution of rock uplift rates and the abrupt along-strike changes in marine terrace elevations favor a regional tectonic model with a step-wise change in rock uplift across the south branch of the Santa Ynez fault. The south branch of the Santa Ynez fault appears to separate two regional tectonic blocks, characterized by rock uplift rates of ∼1.3−1.6 m/k.y. to the east and slightly lower rates to the west (∼0.8−1.4 m/k.y.). Our observations suggest that coastal rock uplift is primarily accommodated by deeply rooted far-field structures such as the offshore Pitas Point−North Channel fault system and the Santa Ynez fault, and that smaller through-going structures impart second-order controls and locally accommodate short-wavelength (<10-km-long strike length) deformation. These results imply that although the rates of rock uplift decline westward along strike, the westernmost portion of the western Transverse Ranges nonetheless accommodates relatively high (>1 m/k.y.) rock uplift rates at a significant distance (>50 km) from the rapidly uplifting (6−7 m/k.y.) Ventura anticline, and >100 km from the prominent restraining bend (“Big Bend”) in the San Andreas fault. The new constraints on the geometry of Quaternary-active structures and regional rates of fault-related deformation have implications for regional earthquake source models and seismic hazard assessment in the highly populated southern California coast region.

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California State Waters Map Series: Offshore of Coal Oil Point, California

Cited by 2 publications

References 68 publications

Shelf evolution along a transpressive transform margin, Santa Barbara Channel, California

Shelf evolution along a transpressive transform margin, Santa Barbara Channel, California

Quaternary chronology and rock uplift recorded by marine terraces, Gaviota coast, Santa Barbara County, California, USA

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