Concord Fault: Difference between revisions
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[[File:Concord-Green Valley Fault.png|thumb|A [[USGS]] map of the Concord and Green Valley fault]] |
[[File:Concord-Green Valley Fault.png|thumb|A [[USGS]] map of the Concord and Green Valley fault]] |
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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, California|Concord]].<ref name="contracostatimes">{{Cite web|url = http://www.contracostatimes.com/breaking-news/ci_27895052/little-known-concord-fault-poses-big-threat|title = Little Known Concord Fault Poses Big Threat|date = |accessdate = |website = |publisher = |last = |first = }}</ref> 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]].<ref>{{Cite web|title = Geological Outings Around the Bay: The Cordelia and Green Valley Faults|url = http://science.kqed.org/quest/2011/06/16/geological-outings-around-the-bay-the-cordelia-and-green-valley-faults/|accessdate = 2015-05-08|website = KQED}}</ref> 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]],<ref>{{cite web|author1=William A. Bryant|title=Digital Database for the Concord and Green Valley faults|url=http://earthquake.usgs.gov/research/external/reports/05HQGR0029.pdf|website=U.S. Geological Survey|accessdate=8 May 2015|date=September 2007}}</ref> moving approximately 2.7 to 3.6 millimeters a year.<ref>{{Cite |
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, California|Concord]].<ref name="contracostatimes">{{Cite web|url = http://www.contracostatimes.com/breaking-news/ci_27895052/little-known-concord-fault-poses-big-threat|title = Little Known Concord Fault Poses Big Threat|date = |accessdate = |website = |publisher = |last = |first = }}</ref> 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]].<ref>{{Cite web|title = Geological Outings Around the Bay: The Cordelia and Green Valley Faults|url = http://science.kqed.org/quest/2011/06/16/geological-outings-around-the-bay-the-cordelia-and-green-valley-faults/|accessdate = 2015-05-08|website = KQED}}</ref> 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]],<ref>{{cite web|author1=William A. Bryant|title=Digital Database for the Concord and Green Valley faults|url=http://earthquake.usgs.gov/research/external/reports/05HQGR0029.pdf|website=U.S. Geological Survey|accessdate=8 May 2015|date=September 2007}}</ref> moving approximately 2.7 to 3.6 millimeters a year.<ref>{{Cite journal|url = http://earthquake.usgs.gov/learn/topics/creep/Creep_BSSA03.PDF|title = Inferences Drawn from Two Decades of Alinement Array Measurements of Creep on Faults in the San Francisco Bay Region|last = Galehouse|first = Jon S.|date = 2003|journal = Bulletin of the Seismological Society of America|doi = 10.1785/0120020226|pmid = |access-date = 17 May 2015|last2 = Lienkaemper|first2 = James J.|issue = 6|volume = 93}}</ref> |
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== Seismic activity == |
== Seismic activity == |
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Revision as of 00:29, 18 May 2015
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
The fault is associated with a series of frequent tremors registered on May 8, 2015 near Concord, California.[5] Currently, it is considered to be under a high stress level and therefore has a higher chance of a major earthquake happening.[6] 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 "the most urban fault” in the East Bay, with potential for a larger event than the 2014 South Napa earthquake.[7] 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
- ^ a b c "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.
- ^ "M3.0 - 1km NE of Pleasant Hill, California".
- ^ "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.
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