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Topic: Parkfield, California

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	Parkfield, California - Wikipedia, the free encyclopedia
		Parkfield is a village in Monterey County, California.
		Parkfield lies along the San Andreas Fault, one of the longest and most geologically active faults, which appears in the town as a seasonally dry creek bed.
		Parkfield is the most closely observed earthquake zone in the world.
	en.wikipedia.org /wiki/Parkfield,_California (505 words)

	Lessons learned at Parkfield (Site not responding. Last check: 2007-11-03)
		While the timing of the major earthquakes at Parkfield has not been entirely regular, it is certainly not random, and there is enough consistency to support the concept that this part of the fault fails at relatively consistent intervals with earthquakes of a predictable size.
		GPS measurements have shown that the extent of inter-seismic slip is generally comparable to the extent of seismic slip, and is concentrated in parts of the fault that slipped the least during seismic events.
		The diagram to the right shows estimated slip amounts on the Parkfield segment of the SAF, including seismic slip from the 1966 earthquake, aseismic slip between 1966 and 2004 (which was largely on parts that did not slip in 1966) and seismic slip in 2004.
	www.mala.bc.ca /~earles/parkfield-oct05.htm (984 words)

	Parkfield: Introduction
		The goal is to observe the fault and surrounding crust at close range at the time before, during and after an earthquake, to better understand the earthquake process and provide a scientific basis for earthquake prediction.
		Led by the USGS and the State of California, the experiment's purpose is to better understand the physics of earthquakes - what actually happens on the fault and in the surrounding region before, during and after an earthquake.
		Available data suggest that all six moderate-sized Parkfield earthquakes may have been "characteristic" in the sense that they all ruptured the same area on the fault.
	quake.wr.usgs.gov /research/parkfield/index.html (425 words)

	Parkfield earthquake - Wikipedia, the free encyclopedia
		Parkfield earthquake is a name given to various large earthquakes that occurred in the vicinity of the town of Parkfield, California.
		In December 2004, seismologists at the University of California, Berkeley announced the discovery of subtle tremors near Cholame, a hamlet near the San Andreas Fault directly south of Coalinga.
		The epicenter of this earthquake is (by various sources) believed to be somewhere in the region from Cholame to Parkfield, a location at the extreme northern end of the locked portion of the fault and at the southern end of the rapidly periodic segment.
	en.wikipedia.org /wiki/Parkfield_earthquake (668 words)

	Parkfield Home Page
		Parkfield experienced a magnitude 6.0 Earthquake on September 28, 2004.
		They came to hunt and gather acorns, and named the valley in which Parkfield rests "Cholame," which means "the beautiful one." The first white settlers arrived in the area in 1854 and were followed by a steady stream of homesteaders.
		However, Parkfield's prosperity was short lived as the mines played out and water flooded the coal mine.
	www.parkfield.com (343 words)

	HISTORIC SEISMICITY OF THE PARKFIELD AREA (Site not responding. Last check: 2007-11-03)
		Crustal deformation measurements along the San Andreas fault southeast of Parkfield indicate that relative motion of the Pacific and North American plates is straining the regions at a rate corresponding to 3 cm per year of right-lateral slip on the San Andreas fault.
		Sieh's intensity map for the March 3, 1901, Parkfield earthquake suggests that the area of strong shaking (modified Mercalli intensity VI or greater) was about twice that of the 1966 Parkfield earthquake, suggesting a somewhat larger magnitude for 1901 than for 1966.
		All of the well-located aftershocks were on the fault southeast of the main shock epicenter, suggesting that fault rupture during the main shock progressed from the northwest toward the southeast.
	www.johnmartin.com /earthquakes/eqpapers/00000075.htm (1765 words)

	Seismological Studies at Parkfield, California
		At Parkfield the achievable location accuracy to which a hypocenter can be specified as well as the predictability of its occurrence time appear to be uniquely favorable for in-situ fault zone measurements.
		The systematics in space, time, size and waveform manifest in the HRSN data at Parkfield are in stark contrast to the seemingly disorganized nature of earthquake rupture and fault deformation observed with routine lower resolution datasets.
		The spatial distribution of hypocenters in the Parkfield area is shown to be consistent with this model, and with a hierarchical clustering of asperities having a discrete rescaling factor of about 20.
	www.seismo.berkeley.edu /seismo/annual_report/ar97_98/node15.html (4086 words)

	Parkfield California- Explore Monterey County California (Site not responding. Last check: 2007-11-03)
		The tiny community of Parkfield is located in the south east corner of Monterey County, about 112 miles from Salinas.
		Parkfield was named because of the settlements surrounding natural oak tree park.
		Parkfield hosts the "Parkfield Rodeo" once a year, every first weekend in May. This rodeo is the real thing where cowboys and cowgirls from all over Monterey County come to compete in this event.
	www.mtycounty.com /pgs/parkfield.html (117 words)

	Parkfield - HighBeam Encyclopedia (Site not responding. Last check: 2007-11-03)
		A mining center for mercury and coal in the early 1900s, when the town had 900 inhabitants, Parkfield is today best known as the "earthquake capital of the world." From 1857 to 1966 six magnitude 6 earthquakes occurred along the San Andreas fault near Parkfield.
		Because the earthquakes occurred at average intervals of 22 years, in the mid-1980s seismologists began setting up a number of different types of monitoring equipment in the local area in hopes of learning more about earthquakes and how to predict them.
		Interview: Andrew Michael discusses the importance of yesterday's earthquake in Parkfield, California
	www.encyclopedia.com /doc/1E1-parkfield.html (285 words)

	Parkfield
		Parkfield is the self-proclaimed earthquake capital of California.
		If you tacked a dollar to the wall in the past know that it went to a good cause; if you are coming to Parkfield consider helping to repopulate the wall knowing that it eventually will go to a good cause.
		Parkfield is known as the earthquake capital because for recent history it has had a 6 point or better earthquake about every 23 years (it's overdue for the next one; and scientists have recently indicated the past sequences could well be just chance).
	tomsdomain.com /travel/short/parkfield.htm (483 words)

	CISN: 2004 Parkfield Earthquake
		Nov 15: The Parkfield ShakeMap has been updated with recently recovered values of peak ground velocity from the CGS stations.
		Because of the timing and distance of this event with the 2004 Parkfield earthquake, there may be a correlation between the events.
		Sept 28: This earthquake is the anticipated Mw 6.0 on the San Andreas fault.
	www.cisn.org /special/evt.04.09.28 (789 words)

	Statistical aspects of Parkfield earthquake sequence and Parkfield prediction experiment
		Historical sequence of moderate earthquakes near Parkfield, California (Bakun and Lindh, 1985; Parkfield, 1988) is often taken to support two models of earthquake occurrence: the characteristic magnitude model and quasi-periodic recurrence model.
		We formalize the Parkfield hypothesis as presented by Bakun and Lindh (1985) and the null hypothesis.
		We examine another aspect of the Parkfield prediction: that the earthquake size distribution in the Parkfield region exhibits a characteristic earthquake pattern (Schwartz and Coppersmith, 1984).
	scec.ess.ucla.edu /~ykagan/parkf.htm (6695 words)

	THE PARKFIELD OPPORTUNITY (Site not responding. Last check: 2007-11-03)
		It is generally influenced by the rates of relative plate motions across that section of the plate boundary, as well as by the documented intervals between past earthquakes.
		However, a physically reasonable model that incorporates the somewhat "off-schedule" Parkfield earthquake of 1934 leads to a much higher probability for Parkfield within the next few years, and it is this calculation on which the current Parkfield prediction experiment is based.
		A significant scientific effort is currently underway, supported by both federal and California state funding, to monitor the Parkfield area with instruments, in the hope that it will be possible to predict the earthquake on a still shorter time scale perhaps hours or days before the event.
	www.johnmartin.com /earthquakes/eqpapers/00000074.htm (1076 words)

	Colorado Plateau Field Institute - Current Events
		Parkfield, California Shaken by Magnitude 6.0 Earthquake and Numerous Aftershocks
		Two aftershocks measuring magnitude 5.0 and 4.5 hit Parkfield on Wednesday morning, September 29, 2004, among the strongest of the more than 500 aftershocks roiling the area where a 6.0 earthquake occurred the day before.
		Parkfield, population 37, is subject to small, unfelt shocks all the time.
	www.cpfieldinstitute.org /k12_event_show.php?event_id=69 (575 words)

	Shakin' on the fault line - Parkfield, California, gets sizable earthquakes an average of once every 22 years - ...
		Parkfield, California -- a quaint town with a one-room schoolhouse, a county library, and a single main street.
		That's because Parkfield sits right atop the San Andreas Fault, the 1,290-km (800-mi) crack in Earth's rocky crust (outer layer) that is the source of many of the Golden State's quakes.
		Parkfield residents are so used to earthquakes that the USGS's prediction didn't even bother them.
	www.findarticles.com /p/articles/mi_m1590/is_n8_v54/ai_20184550 (910 words)

	Granville Redmond Exhibit (Site not responding. Last check: 2007-11-03)
		One of California's most notable Impressionist painters and considered the first resident Impressionist of that state, Granville Redmond is known for his landscapes, many of them florals with poppies and lupines.
		Redmond distinguished himself, winning the W.E. Brown medal of excellence, and in 1893 was awarded funds from the California School of the Deaf which made it possible for him to study in Paris at the Academie Julian under Jean Paul Laurens and Benjamin Constant.
		Some of his finest paintings are of Catalina Island in Southern California, and of the oaks of Monterey County in Northern California.
	www.californiapaintings.com /granred182.html (783 words)

	USGS: Seismic Wave Monitoring At Parkfield, California
		Since discovery of the widespread occurrence of microearthquake clusters at Parkfield the irregularity has been found to be comparable to that seen in large repeating earthquakes, and a prototype prediction exercise for Parkfield microearthquakes is underway based on their regularity.
		Recurrence intervals for characteristic sequences in the control group were found to be proportional to the size of the events (Figure 3) for the range of magnitudes and the monitoring interval available.
		One element of the Parkfield Prediction Experiment has been the regular excitation of seismic P- and S-waves by a shear-wave Vibroseis at several sourcepoints throughout the ten-station borehole network in a search for evidence of changes associated with the nucleation process of the anticipated M6 earthquake.
	erp-web.er.usgs.gov /reports/annsum/vol40/nc/g2540.htm (1958 words)

	A Strong Earthquake Shakes Central California Fulfilling USGS' Parkfield Forecast
		This earthquake had been anticipated by the U.S. Geological Survey (USGS), California Geological Survey (CGS) and their partners in 1984, and instrumentation of the Parkfield area had begun in 1986.
		Tuesday's earthquake, dubbed Parkfield 2004, is the seventh in a series of historically known earthquakes occurring on the same part of the San Andrea Fault since 1857.
		Parkfield 2004 ruptured the San Andreas from southeast to northwest.
	www.scec.org /education/040930parkfield.html (858 words)

	Maps for Parkfield
		The primary reason, of course, is that Parkfield is the site of the first prediction experiment in the United States.
		Lindh, A. and M. Lim, A clarification, correction, and updating of Parkfield, California, earthquake prediction scenarios and response plans, USGS Open-File Report 95-695, 1995.
		Michael, A. J., and L. Jones, A reevaluation of the seismicity alert probabilities at Parkfield, California, USGS Open-File Report 95-630, 1995.
	www.ncedc.org /oldeqs/Parkfield.html (301 words)

	Still waiting for the 1987 Parkfield earthquake (Site not responding. Last check: 2007-11-03)
		The San Andreas Fault (SAF) passes through the small town of Parkfield, California, which is situated roughly halfway between Los Angeles and San Francisco.
		Murray and Segall (2002) have estimated the rate of strain accumulation on the Parkfield segment of the SAF, and they conclude that the most of the strain released by the 1966 quake had re-accumulated by 1981, and that there is a 95% probability that another large quake should have occurred by 1987.
		Murray and Segall go on to argue that the 36 years worth of strain that has now accumulated at Parkfield is substantially more than that which had accumulated prior to the previous six large earthquakes, and therefore if the segment fails soon (eg.
	www.mala.bc.ca /~earles/parkfield-sep02.htm (631 words)

	CISN: 2004 Parkfield Earthquake - Comparison with the forecast
		Analysis of the aftershocks and rupture models of the 2004 Parkfield indicates that it ruptured along the same section of the fault in an earthquake of similar magnitude to the earlier members of the Parkfield earthquake series.
		This "Long-Term Prediction" was evaluated and endorsed by the National Earthquake Prediction Evaluation Council in 1985, and the State of California was notified by the USGS that there was a high probability of about M 6 earthquake in the Parkfield region in the 1985-1993 interval.
		Thus, while the Parkfield 2004 earthquake was not late according to current models, accurately forecasting the time of damaging earthquakes remains as a significant challenge.
	www.cisn.org /special/evt.04.09.28/parkfield.html (668 words)

	Do Unto Others Project-Church of the Science of God
		They included the idea that quakes could recur with some regularity; that the more time a fault had to build up strain, the larger the eventual quake would be; and that the same fault segment would rupture in the same characteristic quake the same magnitude and same section of fault—each time.
		Parkfield earthquakes—once considered among the most regular of quakes—~are certainly not peas in a pod,” observes Menlo Park’s Johnston.
		The 1966 Parkfield main shock was preceded by a number of possible and even certain precursors.
	www.dountoothers.org /quakesecrets.html (891 words)

	Seismo-Watch Special Earthquake Report No. 99-006
		The focal point was placed at 5 km beneath the surface for quick processing and the University of California, Seismological Laboratory, fault plane solution suggested strike-slip motion along a northwest trending fault plane.
		The quake occurred within the "Parkfield Experiment", a segment of the San Andreas fault thought to be the initiation spot for a major earthquake in the future.
		Covering all the earthquake activity for the Central California region, including the ever active creeping segments of the San Andreas and Calaveras faults.
	www.seismo-watch.com /EQS/AB/99/990226.Parkfield4.0.html (371 words)

	Researchers Drill Towards the San Andreas Fault
		The hole, located in Parkfield, California, is the first step in creating SAFOD--the San Andreas Observatory at Depth, which is part of EarthScope.
		In Parkfield, California you can walk up to a ranch fence and see how it has become crooked over time by the movement of the San Andreas fault (SAF).
		Parkfield is a good example of how unpredictable earthquakes are.
	www.spacedaily.com /news/tectonics-02g.html (2276 words)

	KPCC \| Consider This: Emergencies
		The Parkfield Coalinga bridge crosses over the San Andreas fault on the Parkfield Coalinga Road on September 30, 2004 Parkfield, California.
		The Southern California Earthquake Center states that in southern California, "every day is 'earthquake season.'" Yet, according to a joint survey conducted by the Red Cross and Duracell in 2003, only about 50 percent of Los Angeles residents have earthquake evacuation plans.
		Two major quakes struck the region in June 2005 alone: a 4.9 quake in San Bernardino County near the town of Yucaipa, and a 5.2 quake in Riverside County.
	www.scpr.org /considerthis/emergencies/1yes.html (402 words)

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