Large-scale right-slip displacement on the East San Francisco Bay Region fault system, California: Implications for location of late Miocene to Pliocene Pacific plate boundary

Tectonics ◽  
1996 ◽  
Vol 15 (1) ◽  
pp. 1-18 ◽  
Author(s):  
R. J. McLaughlin ◽  
W. V. Sliter ◽  
D. H. Sorg ◽  
P. C. Russell ◽  
A. M. Sarna-Wojcicki
Keyword(s):  
San Francisco ◽  
Late Miocene ◽  
Large Scale ◽  
San Francisco Bay ◽  
Plate Boundary ◽  
Pacific Plate ◽  
Fault System ◽  
Slip Displacement

scholarly journals Adapting to sea level rise: Emerging governance issues in the San Francisco Bay Region

2018 ◽  
Author(s):  
Pedro J. Pinto ◽  
G. Mathias Kondolf ◽  
Pun Lok Raymond Wong
Keyword(s):  
Sea Level Rise ◽  
Sea Level ◽  
San Francisco ◽  
Urban Areas ◽  
Path Dependence ◽  
Large Scale ◽  
San Francisco Bay ◽  
Metropolitan Region ◽  
Environmental Benefit ◽  
Formidable Challenge

San Francisco Bay, the largest estuary on the Pacific Coast of North America, is heavily encroached by a metropolitan region with over 7 million inhabitants. Urban development and infrastructure, much of which built over landfill and at the cost of former baylands, were placed at very low elevations. Sea-level rise (SLR) poses a formidable challenge to these highly exposed urban areas and already stressed natural systems. “Green”, or ecosystem-based, adaptation is already on the way around the Bay. Large scale wetland restoration projects have already been concluded, and further action now often requires articulation with the reinforcement of flood defense structures, given the level of urban encroachment. While levee setback, or removal, would provide greater environmental benefit, the need to protect urban areas and infrastructure has led to the trial of ingenious solutions for promoting wetland resilience while upgrading the level of protection granted by levees.We analyzed the Bay’s environmental governance and planning structure, through direct observation, interviews with stakeholders, and study of planning documents and projects. We present two cases where actual implementation of SLR adaptation has led, or may lead to, the need to revise standards & practices or to make uneasy choices between conflicting public interests.Among the region’s stakeholders, there is an increasing awareness of the risks related to SLR, but the institutional arrangements are complex, and communication between the different public agencies/departments is not always as streamlined as it could be. Some agencies and departments need to adapt their procedures in order to remove institutional barriers to adaptation, but path dependence is an obstacle. There is evidence that more frank and regular communication between public actors is needed. It also emphasizes the benefits of a coordination of efforts and strategies, something that was eroded in the transition from government-led policies to a new paradigm of local-based adaptive governance.

scholarly journals When floods hit the road: Resilience to flood-related traffic disruption in the San Francisco Bay Area and beyond

2020 ◽  
Vol 6 (32) ◽  
pp. eaba2423
Author(s):  
Indraneel G. Kasmalkar ◽  
Katherine A. Serafin ◽  
Yufei Miao ◽  
I. Avery Bick ◽  
Leonard Ortolano ◽  
...  
Keyword(s):  
Sea Level ◽  
San Francisco ◽  
Large Scale ◽  
San Francisco Bay ◽  
Southern Oscillation ◽  
San Francisco Bay Area ◽  
Storm Surges ◽  
Urban Traffic ◽  
Bay Area ◽  
Flood Exposure

As sea level rises, urban traffic networks in low-lying coastal areas face increasing risks of flood disruptions. Closure of flooded roads causes employee absences and delays, creating cascading impacts to communities. We integrate a traffic model with flood maps that represent potential combinations of storm surges, tides, seasonal cycles, interannual anomalies driven by large-scale climate variability such as the El Niño Southern Oscillation, and sea level rise. When identifying inundated roads, we propose corrections for potential biases arising from model integration. Our results for the San Francisco Bay Area show that employee absences are limited to the homes and workplaces within the areas of inundation, while delays propagate far inland. Communities with limited availability of alternate roads experience long delays irrespective of their proximity to the areas of inundation. We show that metric reach, a measure of road network density, is a better proxy for delays than flood exposure.

Study of Park-and-Ride Facilities and Their Use in the San Francisco Bay Area of California

2005 ◽  
Vol 1927 (1) ◽  
pp. 46-54 ◽  
Author(s):  
Manish Shirgaokar ◽  
Elizabeth Deakin
Keyword(s):  
San Francisco ◽  
Large Scale ◽  
San Francisco Bay ◽  
San Francisco Bay Area ◽  
Park And Ride ◽  
Bay Area ◽  
Transit Services ◽  
Focus Group Data ◽  
Schedule Adherence ◽  
Almost All

Park-and-ride lots are important support facilities for transit and ride-sharing in the San Francisco Bay Area of California. The authors designed and carried out the region's first large-scale, detailed study of park-and-ride facilities and users. Three Bay Area Rapid Transit (rail) station parking lots were also surveyed. The user survey results showed that almost all the parking users were commuters; at the freeway lots, half were transit users and the remainder were organized and casual car-poolers. Most drove alone to the park-and-ride lot and made long trips to work, many more than 30 mi one way. Users had concerns about lot security, the lack of lighting, and the quality of transit services offered. Analysis of focus group data determined that schedule adherence rather than frequency was the cause of most concerns. Participants expressed a willingness to pay for parking that was fenced, security patrolled, and lighted, with shelters for waiting. Together, the surveys and focus groups have provided insights into ways to improve the park-and-ride lots and the services offered there, as well as on how travelers view transit and carpooling options. The results provide a sound basis for planning improvements.

scholarly journals The Evergreen basin and the role of the Silver Creek fault in the San Andreas fault system, San Francisco Bay region, California

Geosphere ◽  
2017 ◽  
Vol 13 (2) ◽  
pp. 269-286
Author(s):  
R.C. Jachens ◽  
C.M. Wentworth ◽  
R.W. Graymer ◽  
R.A. Williams ◽  
D.A. Ponce ◽  
...  
Keyword(s):  
San Francisco ◽  
San Andreas Fault ◽  
San Francisco Bay ◽  
Fault System ◽  
San Andreas ◽  
San Andreas Fault System

Controls on timing and amount of right-lateral offset on the East Bay fault system, San Francisco Bay region, California

2002 ◽  
Vol 114 (12) ◽  
pp. 1471-1479 ◽  
Author(s):  
R.W. Graymer ◽  
A.M. Sarna-Wojcicki ◽  
J.P. Walker ◽  
R.J. McLaughlin ◽  
R.J. Fleck
Keyword(s):  
San Francisco ◽  
San Francisco Bay ◽  
Fault System ◽  
East Bay ◽  
Lateral Offset

scholarly journals Pacific Plate slab pull and intraplate deformation in the early Cenozoic

2014 ◽  
Vol 6 (1) ◽  
pp. 145-190 ◽  
Author(s):  
N. P. Butterworth ◽  
R. D. Müller ◽  
L. Quevedo ◽  
J. M.O'Connor ◽  
K. Hoernle ◽  
...  
Keyword(s):  
Large Scale ◽  
Driving Forces ◽  
Plate Boundary ◽  
Pacific Plate ◽  
Plate Motion ◽  
Age Progression ◽  
Intraplate Volcanism ◽  
Intraplate Deformation ◽  
Lithospheric Extension ◽  
Early Cenozoic

Abstract. Large tectonic plates are known to be susceptible to internal deformation, leading to a range of phenomena including intraplate volcanism. However, the space and time dependence of intraplate deformation and its relationship with changing plate boundary configurations, subducting slab geometries, and absolute plate motion is poorly understood. We utilise a buoyancy driven Stokes flow solver, BEM-Earth, to investigate the contribution of subducting slabs through time on Pacific Plate motion and plate-scale deformation, and how this is linked to intraplate volcanism. We produce a series of geodynamic models from 62 to 42 Ma in which the plates are driven by the attached subducting slabs and mantle drag/suction forces. We compare our modelled intraplate deformation history with those types of intraplate volcanism that lack a clear age progression. Our models suggest that changes in Cenozoic subduction zone topology caused intraplate deformation to trigger volcanism along several linear seafloor structures, mostly by reactivation of existing seamount chains, but occasionally creating new volcanic chains on crust weakened by fracture zones and extinct ridges. Around 55 Ma subduction of the Pacific-Izanagi ridge reconfigured the major tectonic forces acting on the plate by replacing ridge push with slab pull along its north-western perimeter, causing lithospheric extension along pre-existing weaknesses. Large scale deformation observed in the models coincides with the seamount chains of Hawaii, Louisville, Tokelau, and Gilbert during our modelled time period of 62 to 42 Ma. We suggest that extensional stresses between 72 and 52 Ma are the likely cause of large parts of the formation of the Gilbert chain and that localised extension between 62 and 42 Ma could cause late-stage volcanism along the Musicians Volcanic Ridges. Our models demonstrate that early Cenozoic changes in Pacific plate driving forces only cause relatively minor changes in Pacific absolute plate motions, and cannot be responsible for the Hawaii-Emperor Bend (HEB), confirming previous interpretations that the 47 Ma HEB does not reflect an absolute plate motion event.

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