Comments on potential geologic and seismic hazards affecting coastal Ventura County, California

Ross, Stephanie L.; Fisher, Michael A.; Frankel, Arthur; Geist, Eric L.; Hudnut, K. W.; Kayen, Robert E.; Lee, Homa J.; Normark, William R.; Wong, Florence L.

doi:10.3133/ofr20041286

Cited by 5 publications

(7 citation statements)

References 33 publications

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“…In addition, including elastic properties and plausible stress distributions from Global Positioning System models [e.g., Marshall et al , ] may help provide robust, interdisciplinary earthquake and tsunami scenarios. We also note that submarine landslides can generate large tsunamis in and near the Santa Barbara Channel, and some landslides are documented in this region [ Ross et al , ; Fisher et al , ]. In fact, modeling of the “Goleta Slide” indicates that a tsunami with local wave heights between 2 and 20 m could have been generated [ Borrero et al , ].…”

Section: Implications For Tsunami Hazard Offshore Southern Californiamentioning

confidence: 93%

“…Other regional reverse faults certainly have the capability of tsunamigenesis. The Santa Cruz Island and Anacapa‐Dume faults, the largest known offshore fault zone near Ventura, CA, is 30 km to the south of the Pitas Point fault and is thought to be capable of generating large earthquakes with M w greater than 7 [e.g., Pinter et al , ; Ross et al , ]. Incorporating the upper Red Mountain fault, which branches off near the intersection of the lower Red Mountain and Pitas Point faults, could strongly affect local tsunami properties in this area [ Fisher et al , ].…”

Section: Implications For Tsunami Hazard Offshore Southern Californiamentioning

confidence: 99%

“…However, tsunamis generated locally by faulting and landslides offshore California can impact the California coastline in a matter of minutes, making it imperative to understand the likelihood of such events. Ross et al [] examined seismic and secondary hazards (e.g., tsunamis and liquefaction) along the coast of Ventura County, California, suggesting that the area is at risk of damaging tsunamis from both the far field (e.g., offshore Alaska) and the near field (e.g., Santa Barbara Channel). Wilson et al [] conducted a California statewide survey to examine possible evidence from tsunami impacts along the coastline, including 20 coastal marshlands.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic models of an earthquake and tsunami offshore Ventura, California

Ryan

Geist

Barall

et al. 2015

Geophysical Research Letters

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The Ventura basin in Southern California includes coastal dip‐slip faults that can likely produce earthquakes of magnitude 7 or greater and significant local tsunamis. We construct a 3‐D dynamic rupture model of an earthquake on the Pitas Point and Lower Red Mountain faults to model low‐frequency ground motion and the resulting tsunami, with a goal of elucidating the seismic and tsunami hazard in this area. Our model results in an average stress drop of 6 MPa, an average fault slip of 7.4 m, and a moment magnitude of 7.7, consistent with regional paleoseismic data. Our corresponding tsunami model uses final seafloor displacement from the rupture model as initial conditions to compute local propagation and inundation, resulting in large peak tsunami amplitudes northward and eastward due to site and path effects. Modeled inundation in the Ventura area is significantly greater than that indicated by state of California's current reference inundation line.

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Section: Implications For Tsunami Hazard Offshore Southern Californiamentioning

confidence: 93%

Section: Implications For Tsunami Hazard Offshore Southern Californiamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Dynamic models of an earthquake and tsunami offshore Ventura, California

Ryan

Geist

Barall

et al. 2015

Geophysical Research Letters

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“…As the offshore oil and gas industry moves towards deeper ocean environments, submarine structures such as oil and gas pipelines become increasingly exposed to less understood hazards, among them gravity and turbidity currents (Dengler & Wilde (1987); Niedoroda et al (2000); Ross et al (2004); Bruschi et al (2006)). Such gravity currents form when a heavier fluid propagates into a lighter one in a predominantly horizontal direction (Benjamin (1968); Simpson (1997)).…”

Section: Introductionmentioning

confidence: 99%

Gravity current flow past a circular cylinder: forces, wall shear stresses and implications for scour

et al. 2010

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The flow of compositional gravity currents past circular cylinders mounted above a wall is investigated numerically. Two-and three-dimensional Navier-Stokes simulations are employed to quantify the force load on the cylinder, along with the friction velocity at the bottom wall near the cylinder, for Reynolds numbers in the range of 2, 000 − 45, 000. While two-dimensional simulations accurately capture the impact stage, they are seen to overpredict the force and friction velocity fluctuations throughout the transient stage.Comparisons between gravity current and constant density flows past circular cylinders show that the impact and transient stages are unique to gravity current flows. During the quasisteady stage, on the other hand, the wake structures and the values of the drag, the peak-to-peak lift, the vortex shedding frequency, and the friction velocity below the cylinder are comparable.The friction velocity below the cylinder depends chiefly on the Reynolds number formed with the front velocity and the gap width. The maximum friction velocity at impact is about 60% larger than during the quasisteady stage, or in a constant density flow. This raises the possibility of aggressive erosion behavior at impact, which may occur in a spanwise localized fashion due to the larger friction velocity near the lobes.

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“…The use of multibeam sonars as tools for both bathymetric mapping and backscatter imaging is well established (Kenny at al., 2003, Brown et al, 2006. Although shallow-water MBES has been widely used in mapping seabed morphology and composition (Beyer et al, 2005;Knaapen et al, 2005, Chakraborty et al, 2006, Mayer et al, 2006, pipeline routes (Paton et al, 1997, Ross et al, 2004, coral reefs (Conway et al, 2005, Roberts et al, 2005, wrecks (Lawrence et al, 2001, Mayer et al, 2003, mines and their extent of burial (Wolfon et al, 2007, Mayer et al, 2007, there is very scarce literature on its employment to monitor reef units or to investigate their horizontal/vertical movements and subsidence (Shyue et al, 1998(Shyue et al, , 2002. Because of this, the key outline of this paper is to investigate the structural evolution of the Senigallia scientifically-planned AR on time using some subsequent Kongsberg EM3000S/EM3002S/EM3002D multibeam surveys..…”

Section: Introductionmentioning

confidence: 99%

Using a Multibeam Echosounder to Monitor an Artificial Reef

Tassetti

Malaspina

Fabi

2015

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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ABSTRACT:Artificial reefs (ARs) have become popular technological interventions in shallow water environments characterized by soft seabed for a wide number of purposes, from fisheries/environmental protection and enhancement to research and tourism. AR deployment has the potential for causing significant hydrographical and biological changes in the receiving environments and, in turn, ARs are strongly affected by the surrounding area in terms of spatial arrangement and structural integrity as well as colonization by benthic communities and finfish. In this context, ARs require a systematic monitoring program that a multibeam echosounder (MBES) can provide better than other sampling methods such as visual dives and ROV inspections that are not quantitative and often influenced by water visibility and diver experience/skills. In this paper, some subsequent MBES surveys of the Senigallia scientifically-planned AR (Northern Adriatic Sea) are presented and state-of-the art data processing and visualization techniques are used to draw post-reef deployment comparisons and quantify the evolution of the reef in terms of spatial arrangement and bulk volume. These multibeam surveys play a leading part in a general multi-year program, started simultaneously with the AR design and deployment and aimed to map how the reef structure quantitatively changes over time, as well as it affects the sea-bottom morphology and the fishery resource. All the data, surveyed over years making use of different sampling methods such as visual and instrumental echosounding observations and catch rate surveys, gain a mechanistic and predictive understanding of how the Senigallia AR functions ecologically and physically across spatial and temporal scales during its design life.

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Comments on potential geologic and seismic hazards affecting coastal Ventura County, California

Cited by 5 publications

References 33 publications

Dynamic models of an earthquake and tsunami offshore Ventura, California

Dynamic models of an earthquake and tsunami offshore Ventura, California

Gravity current flow past a circular cylinder: forces, wall shear stresses and implications for scour

Using a Multibeam Echosounder to Monitor an Artificial Reef

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