Concord Fault

A USGS map of the Concord and Green Valley fault

The Concord Fault is a geologic fault in the San Francisco Bay Area. It is so called because it is located under the city of Concord.^[1] It is connected to, and considered to be part of, the same fault zone as the Green Valley fault, which lies just a few miles to the north across the Suisun Bay.^[2] The fault is situated at the east of West Napa Fault and extends from Mount Diablo to the Carquinez Strait, an approximately 11 mile long distance. Like most other faults in this area, the Concord Fault is a strike-slip fault,^[3] moving approximately 2.7 to 3.6 millimeters a year.^[4]

Seismic activity

Currently, it is considered to be under a high stress level and therefore has a higher chance of a major earthquake happening.^[5] There have been earthquakes on this fault before. On October 23, 1955, a 5.4 magnitude quake caused about 1 million dollars in damage (about 8.7 million today) and one death. The last large earthquake linked to this fault occurred over 400 years ago.^[1]

Dangers

According to USGS seismologists it is "the most urban fault” in the East Bay, with potential for a larger event than the 2014 South Napa earthquake.^[6] As critical infrastructure, including refineries that produce a significant portion of the state's total crude oil, and a railroad bridge, lie under it, a major earthquake from it could leave the entire northern half of the state without fuel and disrupt transmission of electricity and water to some extent across the state. One particular pumping station, if hit by a quake, would particularly damage transmission of fuel. A major earthquake there could also cause flooding, which would impact drinking quality, and a loss of electricity.^[1]

References

1 2 3 "Little Known Concord Fault Poses Big Threat".
↑ "Geological Outings Around the Bay: The Cordelia and Green Valley Faults". KQED. Retrieved 2015-05-08.
↑ William A. Bryant (September 2007). "Digital Database for the Concord and Green Valley faults" (PDF). U.S. Geological Survey. Retrieved 8 May 2015.
↑ Galehouse, Jon S.; Lienkaemper, James J. (2003). "Inferences Drawn from Two Decades of Alinement Array Measurements of Creep on Faults in the San Francisco Bay Region" (PDF). Bulletin of the Seismological Society of America. 93 (6). doi:10.1785/0120020226. Retrieved 17 May 2015.
↑ "Earthquake Swarm Rattles Concord Fault in East Bay".
↑ "Concord Fault That Saw 3.6 Magnitude Quake Has Potential To Do Major Damage To East Bay". CBS SF Bay Area. 3 May 2015. Retrieved 7 May 2015.

Seismically active fault zones and tectonic blocks of California

Statewide Faults	San Andreas Fault

Faults, zones, and blocks of Southern California	Brawley Seismic Zone Chino Fault Elsinore Fault Zone Elysian Park Fault Garlock Fault Hosgri Fault Imperial Fault Zone Laguna Salada Fault Newport–Inglewood Fault Peninsular Ranges Puente Hills Fault Raymond Fault Rose Canyon Fault Salton Trough Salinian Block San Cayetano Fault San Felipe Fault Zone San Gabriel Fault San Jacinto Fault Zone Santa Maria River Fault Santa Ynez Fault Shoreline Fault Ventura Fault White Wolf Fault Whittier Fault Yorba Linda Fault

Faults and zones of Northern California	Bartlett Springs Fault Calaveras Fault Clayton-Marsh Creek-Greenville Fault Concord Fault Hayward Fault Zone Healdsburg Fault Maacama Fault Mendocino Fracture Zone Mendocino Triple Junction Mount Diablo Thrust Fault Monta Vista Fault Pleasanton Fault San Gregorio Fault San Pablo Fault Seal Cove Fault Serra Fault Silver Creek Fault Tesla Fault West Napa Fault

Sierra Nevada faults, zones, and blocks	Death Valley Fault Zone Furnace Creek Fault Zone Honey Lake Fault Zone Kern Canyon Fault Maria fold and thrust belt Owens Valley Fault Rescue Lineament-Bear Mountains fault zone Sierra Nevada Batholith Sierra Nevada Fault Sierra Nevada-Great Valley Block Smartville Block Walker Lane

Category California Geological Survey Seismic Hazards Mapping Act Mexico (list)

Significant seismically active faults of North America

North America
(crosses national borders)

Alaska-Aleutian megathrust (US-RU)
Basin and Range Province (US-MX)
Cascadia subduction zone (US-CA)
Clarendon-Linden fault system (US-CA)
Denali Fault (US-CA)
Northern Cordilleran Volcanic Province (CA-US)
Puget Sound faults (US-CA)
Rio Grande rift (US-MX)
San Andreas Fault (US-MX)
Southern Great Lakes Seismic Zone (US-CA)
Tintina Fault (US-CA)

Canada

United States

Washington and Oregon	Brothers Fault Zone Olympic-Wallowa Lineament Puget Sound (Seattle Fault, Tacoma Fault) Walker Lane

California	Calaveras Fault Garlock Fault Hayward Fault Zone Mendocino Fracture Zone Newport–Inglewood Fault Puente Hills Fault Rose Canyon Fault San Jacinto Fault Zone (Elsinore Fault Zone)

Great Basin	Independence Valley fault system Moab Fault Teton Fault Wasatch Fault

Great Plains	Central Oklahoma Fault Zone Humboldt Fault Long Point–Eureka Heights fault system Nemaha Fault Zone Wilzetta Fault

Midwest	Marianna Fault New Madrid Seismic Zone Sandwich Fault Zone Wabash Valley Seismic Zone

Appalachian Mountains and Atlantic Coast	Aiken-Augusta Fault Eastern Tennessee Seismic Zone Middleton Place-Summerville Seismic Zone (Woodstock Fault) Northern Appalachians Seismic Zone Ramapo Fault Virginia Seismic Zone

Caribbean & Mexico

Cayman Trough
Chixoy-Polochic Fault
Enriquillo–Plantain Garden fault zone (Cuba)
Gulf of California Rift Zone
Lesser Antilles subduction zone
Middle America Trench (Central America)
Motagua Fault (Central America)
Pedro Miguel Fault
Puerto Rico Trench

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