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Topic: Fracture zone

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	comminuted fracture - Search Results - MSN Encarta
		Fracture (anatomy), break or crack in a bone or in ossified cartilage.
		Simple, or closed, fractures are not visible on the surface.
		Fracture (engineering), in engineering, the breaking of a solid material from repeated stress, or as the result of a single strong impact.
	ca.encarta.msn.com /comminuted_fracture.html (166 words)

	[No title] (Site not responding. Last check: 2007-09-14)
		The separation between the fracture zone and abyssal hill fabric on younger crust is poorly defined, and is characterized by oblique lineaments in the side-scan imagery.
		A change in spreading direction is not well constrained by the off-axis trace of the fracture zone, but is based primarily on the presence of anomalous bathymetry or relict intersection highs on the older sides of the fracture zone across from 1.5 Ma crust (Figures 2a, 2b).
		On the younger side of the fracture zone plate motion has become oriented with the new spreading direction, while the older side of the fracture zone has a plate motion vector that is somewhat intermediate to the new and old spreading directions (Figure 8).
	bobbyorr.gso.uri.edu /~robp/papers/JGR_96.html (8557 words)

	Results from Geothermal Logging, Air and Core-Water Chemistry Sampling, Air-Injection Testing and Tracer Testing in the ...
		The proximity of the elevated tritium samples to the main trace of the GDF and to the 12-m-broken zone (figure 8) indicated that the fault is a conduit for the transport of water from the ground surface through the nonwelded tuff of the Paintbrush Group and down to the Tptpmn.
		The fault zone extends from 15.0 to 18.4 m and is composed of a brecciated zone associated with the main trace of the fault and the adjacent intensely fractured hanging wall.
		These three zones corresponded to the structural units: footwall, fault zone, and hanging wall; the fault zone coresponds to the intensely fractured zone that extended from the main trace of the GDF 1 m into the footwall and 3 m into the hanging wall.
	www.ocrwm.doe.gov /documents/sp3515m3_a/main.htm (16059 words)

	Mammoth Geophysical
		Given that a fracture zone is going to be wetter or dryer than the surrounding rock, the electrical resistance within the fracture zone is going to be different than the rock on each side of the fracture.
		This difference is measurable by means of an earth resistivity meter and is called a fracture zone response anomaly.ERPS are generally run with a station spacing of 10 feet and an "A" spacing of 60 feet.
		A total of 660 feet of ERPS fracture survey was run to gather the data needed to determine if (1) the suspected fracture zone was indeed a natural fracture zone and (2) where the center of the fracture zone is located on the surface.
	www.mammoth-geo.com /explained3.htm (358 words)

	Mammoth Geophysical
		Natural fracture pinpointing by means of Natural Gamma Fracture Surveys (NGFS for short) falls under the general term of Radiometric Geophysics and works on the principle that Uranium isotopes are mobile through diffusion in groundwater.
		The "NGFS" (Natural Gamma Fracture Survey) Surveys shown on the other side of this sheet was designed to cross and verify a suspected natural fracture zone and has a Mean of 71, a Standard Deviation of 4, thus a Threshold Value of 75.
		The "ERPS" (Earth Resistivity Profiling Survey) fracture surveys shown on the other side of this sheet was designed to cross and delineate a suspected natural fracture zone in an area identified by the client.
	www.mammoth-geo.com /explained4.htm (637 words)

	FRACTURE TRACE ANALYSIS--An Innovative Method for Optimum Well Placement (Site not responding. Last check: 2007-09-14)
		In fractured rock, the gradient is definedby the orientation of joints, faults, bedding planes and shatter zones.
		Fracture traces are natural, linear topographic features formed by the presence of water in the underlying fractures or fracture zones.
		The moisture content of soil overlying a fracture zone is increased by two major processes: (1) the accumulation of surface-water runoff in topographic sags, and (2) the transfer of water through the soil by vegetative root systems.
	www.hydrotechno.com /docs/doc2.html (619 words)

	Fracture Permeability in Crystalline Rocks
		Evidence for Fracture Permeability in the Crystalline Rocks of the Eastern and Southeastern U.S. The presence of deep fracture permeability in crystalline rocks is now recognized as widespread and therefore potentially important for groundwater geothermal heat pump applications.
		Data from water-bearing fractures from 227 wells in metamorphic and igneous rocks in Coastal Maine indicate that there is no evidence that fracture yield or fracture density decrease with depth in at least the upper 600 feet (Loiselle and Evans, 1995).
		The fracture zone appears to be related to relief of overburden stress.
	rglsun1.geol.vt.edu /fracture-evidence.html (1165 words)

	Blanco Fracture Zone Quakes
		The Blanco Fracture Zone is one of several seismically active transform faults off the coast of Oregon.
		Double lines with arrows pointing in opposite directions represent oceanic spreading centers, which are seismically quiet except for occasional swarms of small earthquakes associated with volcanic eruptions near the Axial Seamount on the JDF spreading center (monitored by the NOAA Vents program).
		Seismicity also occurs along a transform fault south of the Blanco F.Z., and along the east-west trending Mendocino Fracture Zone near the bottom of the figure.
	www.ess.washington.edu /SEIS/PNSN/INFO_GENERAL/blanco.html (335 words)

	AOE 3054 Experiment #5 FRACTURE TOUGHNESS TESTING
		The fracture toughness and the manner in which the crack grows is heavily dependent upon the material thickness.
		To determine their fracture toughness each of the samples will be pulled apart by applying load to a pair of dowel pins mounted through the holes in each sample.
		The relationship between the stress intensity and the load applied to the sample is not a simple one since it depends on the form of the stress field far from the crack where the shape of the sample and its precise loading conditions are important.
	www.aoe.vt.edu /~devenpor/aoe3054/manual/expt5/text.html (3270 words)

	SPE59312
		During the main fracturing stage, geophones above the fracture zone for wells MO-1 and MO-2 both roughly along the inferred vertical fracture plane exhibited conical-wave amplitude increases that are caused by shear wave reflection r scattering off the top of a fracture zone.
		From changes in the reflection amplitude as a function of depth, we interpret that the fracture zone initially extends along a confined vertical plane at a depth that correlates with many of the microseismic events.
		Toward the end of the main fracturing stage, the fracture zone extends upward and extends in width, although we cannot determine the dimensions of the fracture from the reflection amplitudes alone.
	petroleum.berkeley.edu /papers/patzek/jpse2.htm (421 words)

	Understanding plate motions [This Dynamic Earth, USGS]
		Land on the west side of the fault zone (on the Pacific Plate) is moving in a northwesterly direction relative to the land on the east side of the fault zone (on the North American Plate).
		Oceanic fracture zones are ocean-floor valleys that horizontally offset spreading ridges; some of these zones are hundreds to thousands of kilometers long and as much as 8 km deep.
		These zones are presently inactive, but the offsets of the patterns of magnetic striping provide evidence of their previous transform-fault activity.
	pubs.usgs.gov /publications/text/understanding.html (2502 words)

	Shackleton Fracture Zone: No barrier to early circumpolar ocean circulation -- Livermore et al. 32 (9): 797 -- Geology
		that the Shackleton Fracture Zone is an oceanic transverse ridge,
		Fracture Zone and the axis of the now-inactive West Scotia Ridge.
		Prince, R.A., and Forsyth, D.W., 1988, Horizontal extent of anomalously thin crust near the Vema Fracture Zone from the three-dimensional analysis of gravity anomalies: Journal of Geophysical Research, v.
	geology.geoscienceworld.org /cgi/content/full/32/9/797 (3135 words)

	Open-File Report 89
		At the intersection of the fracture zone with the Rio Grande rift, basin extension across the rift changes from an estimated 30% to the north to 50% to the south.
		The Jemez lineament is a broad northeast trending tectonically active zone which intersects the RGR 185 km north of the junction of the SFZ with the rift (Figures 2 and 3).
		Accommodation zones of probable Precambrian origin occur within the SFZ and elsewhere in the RGR with orientations paralleled or sub-paralleled to the track of the fracture zone.
	www.ees.nmt.edu /Geop/nmquakes/R89/R89.HTM (4130 words)

	Fracture process zone in granite (Site not responding. Last check: 2007-09-14)
		Propagation velocity of the process zone is varied by using the rate of acoustic emissions to control the applied axial force.
		The ratio of the process zone width to the fault length in Aue granite ranges from 0.01 to 0.1 inferred from crack data and acoustic emissions, respectively.
		The fracture surface energy is estimated from microstructure analysis to be ~2 J. A lower bound estimate for the energy dissipated by acoustic events is 0.1 J. Journal of Geophysical Research, Vol.
	www.gfz-potsdam.de /pb3/pg32/projects/ae.html (320 words)

	ODP Leg 176 (Return to Hole 735B) (Site not responding. Last check: 2007-09-14)
		Thus, the Atlantis II Fracture Zone and the adjacent ocean crust is entirely oceanic in origin, free from the complications of continental breakup such as those found at some equatorial fracture zones along the Mid-Atlantic Ridge (e.g., Bonatti and Honnorez, 1976).
		The magmatic breccia zone is characterized by a gradual increase in resistivities due to the decrease in Fe-Ti minerals.
		These crosscutting fractures are dipping at 90 from each other but at this time, the lack of evidence for a second fracture in the recovered core and BHTV data prevents a classification as a conjugate pair of fractures.
	www.ldeo.columbia.edu /BRG/ODP/ODP/LEG_SUMM/176/leg176.html (5674 words)

	Why there are no earthquakes on the Marquesas Fracture Zone
		The observation that fracture zones are notably aseismic has led to the proposition of high strength along fracture zones, such that the differential subsidence is accommodated by flexure across a locked fault.
		This model predicts that a ridge develops on the young side of the fracture zone flanked by a foredeep trough on the old side, with parallel warping of the Moho and large associated gravity anomalies.
		After accounting for these complications, the fracture zone appears capable of sustaining at least 20 MPa of shear stress and remains locked along the entire length of the fault except perhaps locally where it passed over the Tuamotu and Society hot spots.
	www.agu.org /pubs/crossref/1995/94JB02886.shtml (562 words)

	Fracture zone - Wikipedia, the free encyclopedia
		An illustration of the difference between the active transform faults between offset ridge axes, and inactive fracture zones.
		These zones extend outward from the ridge axis and are seismically inactive areas which may display evidence of past transform fault activity.
		Lithospheric plates on either side may move in opposite directions on either side of a transform fault, the plate segments adjacent to the outside segments of this fracture zone move in the same direction.
	en.wikipedia.org /wiki/Fracture_zone (125 words)

	Crustal Evolution of the Mid-Atlantic Ridge near the Fifteen-Twenty Fracture Zone in the last 5 Ma
		The Mid-Atlantic Ridge around the Fifteen-Twenty Fracture Zone is unique in that outcrops of lower crust and mantle rocks are extensive on both flanks of the axial valley walls over an unusually long distance along-axis, indicating a high ratio of tectonic to magmatic extension.
		In contrast, crust in two ridge segments immediately north of the fracture zone and two immediately to the south is characterized by rugged and blocky topography, by low-amplitude and discontinuous magnetization stripes, and by RMBA highs that imply thin crust throughout the last 5 Ma.
		North of the fracture zone, however, megamullions are that thought to have formed by slip on long-lived normal faults are found on both ridge flanks at different ages and within the same spreading segment.
	www.agu.org /pubs/crossref/2003/2002GC000364.shtml (456 words)

	EMA 519: Fracture Mechanics (Site not responding. Last check: 2007-09-14)
		Introduction to fracture mechanics of nonlinear materials: the J-integral; the Hutchinson-Rice-Rosengren (HRR) crack tip fields; the J_Ic fracture criterion; J_Ic testing; J-controlled crack growth and the crack growth resistance (JR) curve; application of J to anisotropic and heterogeneous materials.
		Fracture, like fatigue, is a failure mode that frequently occurs without warning and with catastrophic results to life and property.
		In terms of the EMA program objectives, it is focused to provide fundamental education via problem-solving, design-oriented team projects and communication in a subject (fracture mechanics) crucial to those planning a career in mechanics and astronautics.
	www.engr.wisc.edu /ep/ema/courses/ema519.html (952 words)

	Swans' Past Commentaries: Book Review of Simon Winchester's "The Fracture Zone: A Return to the Balkans," by Aleksandra ...
		The bandwaggon has proved wide and strong, and The Fracture Zone is exactly this - a bandwaggon book, an attempt by the author of such books as The Surgeon of Crowthorne to cash in on the topic.
		The Fracture Zone is not a book to be proud of - there is too much of the "foreign correspondent" for it to be pretty travelogue, and too much overt partisanship for it to succeed as impartial political analysis.
		As for The Fracture Zone, the best I can wish for Simon Winchester is that his next book is good enough to make readers forget that he ever wrote this one.
	www.swans.com /library/art6/alekp006.html (1162 words)

	Completions - Post-Frac Evaluation of Multiple Zone Fracture Treatments Using a Completion Efficiency Index - Thu ...
		When multiple zones or long intervals are perforated in a single frac stage multiple fractures of varying lengths may be created.
		Verifying individual zone frac lengths in multiple zone completions is difficult with traditional post frac analysis techniques due to the multiple reservoir layers involved.
		From this analysis it is clear that shorter than optimum fracture lengths are being created when operators complete long perforated intervals or more than one perforated interval in a single frac stage.
	www.spegcs.org /en/cev/?281 (622 words)

	compound fracture - Search Results - MSN Encarta
		compound fracture - Search Results - MSN Encarta
		Fracture (anatomy), picture of a compound fracture, picture of various fractures
		Chemical Reaction, process by which atoms or groups of atoms are redistributed, resulting in a change in the molecular composition of substances.
	ca.encarta.msn.com /compound_fracture.html (103 words)

	SOSUS: Acoustic Monitoring Program
		On 6 April, 1997, the T-phase Monitoring System recorded what may be volcanic seismicity from the central Blanco Fracture Zone (Cascadia Depression).
		The event is located near what is thought to be a proto-spreading center within the fracture zone.
		Earthquake epicenters from the central Blanco Fracture Zone recorded April 6-8, 1997.
	www.pmel.noaa.gov /vents/acoustics/seismicity/nepac/blanco0497.html (100 words)

	Geochemistry of oceanic fracture zones and spreading centers
		The 35 rock cores recovered from 1994 to 1997 from the walls of Monterey and Carmel canyons yielded significant geochemical, petrological, and age data.
		In the coming year we will analyze samples previously collected from the Blanco Fracture Zone, the Mendocino Ridge, and the Atlantis II Fracture Zone to address questions of seafloor metamorphism, seawater-rock interactions, and high-temperature deformation in these areas of the seafloor.
		For a series of dives planned for 1999 in the Mendocino Fracture Zone, we will piece together detailed base maps from existing SeaBeam and EM300 data.
	www.mbari.org /rd/projects/1999/fracture_zones_spreading_centers.html (385 words)

	Amazon.com: The Fracture Zone: My Return to the Balkans: Books: Simon Winchester (Site not responding. Last check: 2007-09-14)
		Simon Winchester, a British newspaper reporter for 30 years and the author of 13 books (including The Professor and the Madman), has turned his attention to the Balkans, an area he visited years ago on a road trip from Vienna to Istanbul--a journey he retraced in the spring of 1999.
		The Fracture Zone describes both of those trips, concentrating on the history and character of the region more than the recent war and its aftermath.
		Winchester's angle on the Balkans is unique and well written: those who have been bewildered at best and bored at worst by the Balkan conflict may find that The Fracture Zone captures their interest better than hundreds of news accounts of war atrocities.
	www.amazon.com /Fracture-Zone-My-Return-Balkans/dp/0060954949 (2193 words)

	Oilfield Glossary: Term 'zone'
		An interval or unit of rock differentiated from surrounding rocks on the basis of its fossil content or other features, such as faults or fractures.
		For example, a fracture zone contains numerous fractures.
		A biostratigraphic zone contains a particular fossil or fossils.
	www.glossary.oilfield.slb.com /Display.cfm?Term=zone (67 words)

	Figure F11. Bathymetric map showing the Atlantis II Fracture Zone and surrounding area. The map was created using the ... (Site not responding. Last check: 2007-09-14)
		Bathymetric map showing the Atlantis II Fracture Zone and surrounding area.
		Strike and dip azimuth rose diagrams are based on FMS interpretations of intermediate (30°-60°) and steep (60°-90°) dips of foliations and fractures in Hole 735B.
		The red P-axis line shows the approximate orientation of the compressional axis of the three strike-slip events along the Atlantis II Fracture Zone.
	www-odp.tamu.edu /publications/176_SR/chap_05/c5_f11.htm (278 words)

	Origin of extensional core complexes: Evidence from the Mid-Atlantic Ridge at Atlantis Fracture Zone
		Kinematic analysis at the Mid-Atlantic Ridge-Atlantis Transform RTI suggests that the formation of seafloor detachments may occur when the rate of extension not accommodated by magmatic input exceeds about 4 mm/yr.
		Isolated volcanic ridges that extend into the fracture zone domain, curving as they approach the fault trace, mark times of abundant magma supply at the segment ends.
		The apparent interplay between magmatic and tectonic strain accommodation at a mid-ocean ridge, as well as the overall structure of oceanic core complexes, may provide important kinematic constraints on core complex formation and the development of shallow-dipping detachment faults.
	dx.doi.org /10.1029/98JB01756 (574 words)

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