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Topic: Hayward Fault

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	Hayward Fault Zone - Wikipedia, the free encyclopedia
		These four fault structures are the major known active slip-strike faults associated with the relative motion of the Pacific Plate to the North American Plate in California at the latitude of San Francisco.
		The Hayward fault is considered to be particularly dangerous due to the poor soil conditions in the alluvial plain that drops from the East Bay Hills to the eastern shoreline of San Francisco Bay.
		In its northern extent the Hayward Fault lies directly beneath the portion of Highway 13 (the Warren Freeway) that is south of its intersection Highway 24 and north of its teminal connection with Interstate 580 (the MacArthur Freeway).
	en.wikipedia.org /wiki/Hayward_Fault_Zone (3771 words)

	Hayward Fault Danger Downgraded
		Scientists are using the SAR interferometry along with other data collected on the ground to monitor this fault motion in an attempt to estimate the probability of earthquake on the Hayward fault, which last had a major earthquake of magnitude 7 in 1868.
		The Hayward fault, considered one of the most dangerous faults in California, stretches more than 95 kilometers (60 miles) and is a branch of the more famous San Andreas fault that extends much of the length of California.
		The segment of the Hayward fault from San Pablo Bay south to the border between Berkeley and Oakland is referred to as the northern Hayward fault.
	www.spacedaily.com /news/tectonics-00a.html (1268 words)

	Geometry and Evolution of the Hayward Fault
		The Hayward Fault is a NW trending, predominantly right-lateral strike-slip fault zone that forms the western boundary of the East Bay Hills.
		The Hayward Fault itself is enigmatic in that it both creeps to a depth of about 5 km along its entire length and is capable of producing large earthquakes, evidenced by the October 21, 1868 M6.8 earthquake that was known as the "Great San Francisco Earthquake" prior to the 1906 earthqauke.
		Modeling indicates that the gabbro extends from the westernmost exposures west of the Hayward Fault to the Chabot Fault on the east.
	wrgis.wr.usgs.gov /docs/gump/ponce/hayward_fault/hf.html (1309 words)

	Fault structure and mechanics of the Hayward Fault, California, from double-difference earthquake locations
		The fine structure of the seismicity suggests that the fault surface on the northern Hayward Fault is curved or that the events occur on several substructures.
		The seismicity is highly organized in space, especially on the northern Hayward Fault, where it forms horizontal, slip-parallel streaks of hypocenters of only a few tens of meters width, bounded by areas almost absent of seismic activity.
		The absence of microearthquakes over large, contiguous areas of the northern Hayward Fault plane in the depth interval from ∼5 to 10 km and the concentrations of seismicity at these depths suggest that the aseismic regions are either locked or retarded and are storing strain energy for release in future large-magnitude earthquakes.
	www.agu.org /pubs/crossref/2002/2000JB000084.shtml (522 words)

	Northern Hayward Fault Judged Less Likely To Trigger A Big One
		On the northern Hayward Fault, the researchers identified three major clusters of identical repeating small quakes along the northern fault zone, representing centers of slippage up to 7 millimeters per year at from 4 to 10 kilometers depth.
		Shallow creep falls off markedly where the fault dives under San Francisco Bay at Point Pinole; creep is at a maximum at El Cerrito, with indications of rapid slippage continuing to great depths; surface creep diminishes south of Berkeley, over the locked portion of the fault that broke in 1868.
		Prospects for the southern Hayward Fault, however, and for the Rodgers Creek fault, north of the Bay, are less sanguine.
	www.lbl.gov /Science-Articles/Archive/hayward-unlocked.html (704 words)

	InSAR Analysis of Creep on the Hayward Fault (Site not responding. Last check: 2007-10-16)
		The Hayward Fault is considered hazardous because of its proximity to the densely populated San Francisco and East Bay areas in California and because of its seismic potential.
		The Northern Hayward Fault is considered hazardous because of its proximity to the densely populated San Francisco and East Bay areas and its large seismic potential.
		Seismic records indicate that the Hayward Fault is close to vertical and that earthquakes occur between three and 10 kilometers beneath the surface of this fault (Oppenheimer, et al., 1992).
	www-mcnair.berkeley.edu /2000journal/Baroody/Baroody.html (3928 words)

	Digging For Earthquake Clues In The Hayward Fault
		The northern section of the Hayward fault, which stretches approximately 45 km (30 miles) from San Leandro, northward to San Pablo Bay, was estimated by the 1990 Working Group on California Earthquake Probabilities to have the highest probability (28% in 30 years) of producing the next magnitude (M)-7 earthquake in the San Francisco Bay area.
		A destructive M7 earthquake occurred on the southern segment of the Hayward fault in 1868.
		A new study of historical documents by the California Division of Mines and Geology (CDMG), however, concludes that the 1836 earthquake was not on the Hayward fault.
	www.eurekalert.org /pub_releases/1997-07/USGS-DFEC-100797.php (655 words)

	Hayward creep processes (Site not responding. Last check: 2007-10-16)
		The fault between 5 and 12 km depth is believed to slip entirely in earthquakes, but the surface fault and deepest part of the fault also slips by a process of aseismic creep.
		This foundation was constructed after the last Hayward earthquake, but several other features offset in the 1896 earthquake have also continued to be offset by creep, indicating that creep incompletely releases strain energy applied to the fault.
		The displacement far from a fault can be measured with GPS methods to an accuracy of approximately 1 mm, but the displacement on the fault can be measured 100 times more precisel;y with a creepmeter.
	cires.colorado.edu /~bilham/HaywardCreep.html (413 words)

	08.17.00 - State-of-the-art measuring techniques show northern Hayward fault slips freely, meaning less chance of a ... (Site not responding. Last check: 2007-10-16)
		The Hayward fault, considered one of the most dangerous faults in California, stretches more than 60 miles from San Pablo Bay in the north to below Fremont in the south, and is a branch of the more famous San Andreas fault that extends much of the length of California.
		The segment of the Hayward fault from San Pablo Bay south to the border between Berkeley and Oakland is referred to as the northern Hayward fault, which may connect under the bay with the Rogers Creek fault that runs through Napa County.
		Until recently, the northern Hayward fault also was ranked high in terms of the chance of a major quake.
	www.berkeley.edu /news/media/releases/2000/08/17_fault.html (1294 words)

	PLANNING SCENARIO for a M=7.5 EARTHQUAKE ON THE HAYWARD FAULT
		The Hayward fault is the southern segment of an extensive fracture zone consisting of the Hayward, Rodgers Creek, Healdsburg, and Maacama fault segments.
		The threat to San Francisco from the Hayward fault was recognized by A. Lawson in 1908 in Report of the State Earthquake Commission, The California earthquake of April 18, 1906, p.
		The Hayward fault traverses the University of California campus where about 20 percent of the floor space is in buildings classified as seismically poor or very poor, some of which can be expected to partially or totally collapse.
	www.johnmartin.com /earthquakes/eqpapers/00000066.htm (3179 words)

	Hayward Fault
		on the Hayward fault at an estimated 9 mm/yr.
		Tour of the Hayward Fault This photographic tour of the Hayward Fault presents images of some of the most easily recognized surface features, from the City of Fremont in central California toward the southern end of the.
		The red cross is along the trace of the Hayward fault, east side of the bay.
	hayward-fault.copeck.org (739 words)

	Hayward fault tour (Site not responding. Last check: 2007-10-16)
		The Hayward fault extends from San Jose 120 km or about 74 miles northward along the base of the East Bay Hills to San Pablo Bay.
		This slow movement, called fault creep (or tectonic creep) can easily be observed where cultural features such as streets, curbs, and buildings straddle the Hayward fault and are deformed by the slow movement.
		Fault creep is most easily recognized where curbs and other structures are bent in a specific direction called right-lateral offset.
	www.mcs.csuhayward.edu /~shirschf/tour-1.html (318 words)

	ABAG Bay Area Fault Rupture Hazard Info
		Because faults are weaknesses in the rock, earthquakes tend to occur over and over on these same faults.
		The California Geological Survey publishes maps of the active faults in the Bay Area that reach the surface as part of its work to implement the requirements of the Alquist-Priolo Earthquake Fault Zone Act.
		Fault information in these digital files is not sufficient to serve as a substitute for the geological site studies required under Chapter 7.5 of Division 2 of the California Public Resources Code.
	www.abag.ca.gov /bayarea/eqmaps/faults (299 words)

	Paleoseismology, Hawyard Fault, CA
		When dates of the past earthquakes can be estimated through the use of radiocarbon and other dating techniques, they provide a basis for estimating the probability of the next earthquake.
		We are currently exhuming several faults in the San Francisco Bay region in search of their ancient earthquake (paleoseismic) histories.
		Hayward fault, perhaps the best and most accessible trench site is at
	quake.wr.usgs.gov /research/geology/paleoseis (627 words)

	Double Difference earthquake location and tomography
		To demonstrate the effectiveness of the method, we have applied it to the Hayward fault dataset of Waldhauser and Ellsworth (2002) to resolve and to study the detailed local 3D seismic velocity structure.
		The event relocations define a nearly planar, vertical fault zone striking in the direction of the surface trace of the Hayward fault in the double-difference locations (Figure 4c).
		We see that the Hayward fault is marked by a strong velocity contrast (Figure 7, 8), and this contrast persists vertically beneath the surface trace of the fault to the maximum depths constrained by the model, similar to the results shown in Hole et al.
	www.geology.wisc.edu /~hjzhang/Hayward.html (3560 words)

	Hayward Fault: UC Berkeley
		Below is a 1923 contour map of the Berkeley area, from Claremont Creek to UC Berkeley, illustrating the landforms and main trace of the Hayward fault.
		Some of these are taken from the Tour of Hayward Fault put together by Sue Hirschfeld at CSU Hayward, while others were shot by Lea Suzuki for the San Francisco Chronicle as part of a story on a new study on the Hayward fault.
		The sense of motion on the Hayward fault is such that the west half of the stadium (left side of the photograph) is moving north relative to the east side.
	www.seismo.berkeley.edu /hayward/ucb_campus.html (518 words)

	The Hayward Fault: Will it trigger the next quake:
		Studies of the Hayward Fault have provided the following clues: its average slip rate is about 9 mm/yr (0.35 in/yr); the latest rupture of its southern segment (Fremont to San Leandro) occurred in 1868; and rupture of the northern section (San Leandro to Pinole) probably occurred in 1936.
		Other concepts, particularly the idea that strain of the earth's crust in the Bay Area has slowly "recharged" after being greatly relaxed by the 1906 San Francisco earthquake, suggest that new Hayward Fault earthquakes are likely during the period of the next few years to decades.
		The accompanying figure shows that ground rupture on the Hayward Fault is likely to close both Centennial Drive and Cyclotron Road for some period of time.
	www.lbl.gov /Science-Articles/Archive/hayward-fault.html (816 words)

	The Hayward Fault: Exposed! (Site not responding. Last check: 2007-10-16)
		The fault is 8 miles deep and 40 miles long (stretching from Milpitas to San Pablo bay).
		Strain accumulating on the fault is estimated to be about 9mm/year (so don't feel too complacent even about that creeping part -- it isn't enough to relieve all the strain).
		The last earthquake on the Hayward was in 1868, roughly magnitude 6.9.
	shallowsky.com /geology/haywardtrench (291 words)

	Virtual Hayward fault tour promises to shake things up Oakland Tribune - Find Articles
		The Hayward fault creeps, on average, one-fifth of an inch northeach year.
		Following the jagged red line of the fault superimposed on the photographs provided by Google Earth, one may be quickly impressed with how many houses sitting directly atop a fault USGS forecasters say will have a one-in-four chance of snapping in the next 30 years.
		Downtown San Francisco, for instance, is as far from the San Andreas fault as it is from the Hayward fault, Perkins noted.
	www.findarticles.com /p/articles/mi_qn4176/is_20060310/ai_n16141057 (771 words)

	LiveScience.com - The Likely Home of California's Next Big Quake
		Several faults lurk beneath this region, including the San Andreas Fault on the west side of the Bay area, but geologists say the parallel Hayward on the Bay's east side is the most likely to snap next.
		The Hayward Fault runs through one of the country's most densely populated areas; experts say 2 million people live close enough to be strongly shaken by a big quake.
		A "virtual tour'' developed by the USGS shows the Hayward Fault slashing through identifiable structures, like DeMuynck's house, but she is resolved not to worry.
	www.livescience.com /forcesofnature/060325_hayward_fault.html (837 words)

	Fault creep and microseismicity on the Hayward fault, California: Implications for asperity size
		Fault creep and microseismicity on the Hayward fault, California: Implications for asperity size
		The Hayward fault is documented to undergo significant creep, with some patches accommodating 50% or more of the long-term fault displacement.
		By comparing the patterns of microseismicity observed on the fault with models of fault zone creep, we can investigate the long-term displacement/deformation history of the fault in terms of the relative roles of aseismic creep, fault slip accommodated through microseismicity, and strain accumulation (slip deficit).
	www.agu.org /pubs/crossref/2003/2003GL017904.shtml (284 words)

	Shallow Thoughts
		Well, okay, the fault itself has been there a while, but it was opening day for the Hayward Fault: Exposed!
		We got lots of visitors who were there specifically to see the fault, not just spillover from the other events: apparently it had gotten press on the TV news and several newspapers.
		The Hayward fault last let go in 1868, a magnitude-6.9 event called "The Great San Francisco Quake" until the 1906 earthquake on the San Andreas took over that title.
	shallowsky.com /blog/science/geology/hayward-exposed.html (609 words)

	Face to face with the Hayward fault (Site not responding. Last check: 2007-10-16)
		The USGS estimates there is a 27 percent chance of an earthquake of magnitude 6.7 or greater in the next 30 years on either the Hayward fault, which runs from Fremont to San Pablo Bay, or the Rogers Creek fault, which runs north from San Pablo Bay to Santa Rosa.
		The last big Hayward fault quake was in 1868 and was probably a magnitude 6.9.
		That jolt, which was known as the Great San Francisco Earthquake until 1906, moved the fault three feet at the Central Park trench, and as much as six feet on the northern stretch of the fault.
	www.topix.net /content/kri/4244281616289637122632223706052687858714 (951 words)

	1906 Earthquake Centennial Alliance: Member Events: The Hayward Fault Exposed! An Interpretive Viewing and Educational ...
		For this exhibit, the Hayward fault was chosen to emphasize that the 1906 quake was not the only damaging earthquake in the history of the Bay Area.
		In 1868, a large earthquake occurred along the Hayward fault, causing significant damage in San Francisco as well as the East Bay.
		Future large earthquakes along the Hayward fault will have devastating effects because of the great concentration of homes, schools, hospitals, roads and other critical structures along and across the fault.
	1906centennial.org /activities/?id=254 (485 words)

	GISuser.com GIS, GPS, LBS, CAD, mapping news, jobs, software, data, community (Site not responding. Last check: 2007-10-16)
		At the time, this Hayward fault earthquake was known as the great San Francisco earthquake, but it lost that title on April 18th, 1906, when the San Francisco earthquake struck along the San Andreas Fault.
		In a 2003 USGS report on earthquake hazards in the Bay Area, the Hayward fault and it’s northern continuation through Santa Rosa, the Rodgers Creek Fault, were assigned a 27 percent probability of producing a magnitude 6.7 or larger earthquake within the next 30 years, the highest probability in the entire Bay Area.
		The new Hayward fault map and virtual tour are intended to serve as an educational tool.
	www.gisuser.com /content/view/8378 (1159 words)

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