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Topic: Graben


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  Graben - Wikipedia, the free encyclopedia
A graben is a depressed block of land bordered by parallel faults.
A graben is the result of a block of land being downthrown producing a valley with a distinct scarp on each side.
A graben is also known as a rift valley.
en.wikipedia.org /wiki/Graben   (78 words)

  
 CONTRASTS IN BASEMENT FAULTS OF THE MISSISSIPPI VALLEY BASEMENT GRABEN AND THE NEW MADRID SEISMIC ZONE   (Site not responding. Last check: 2007-11-07)
Cretaceous strata in the broadly synclinal Mississippi Embayment overlie the boundary faults of the Mississippi Valley graben.
The south segment of the northeast-trending alignment is near the mid-line of the graben.
The northwest-trending alignment crosses the northwestern graben boundary, and the north segment of the northeast-trending alignment is northwest of the graben.
gsa.confex.com /gsa/2002NC/finalprogram/abstract_32488.htm   (459 words)

  
 Tharsis-radial graben systems as the surface manifestation of plume-related dike intrusion complexes: Models and ...
Several zones of graben (Memnonia, Sirenum, Icaria, Thaumasia, and Claritas Fossae) extend radially away from the Tharsis rise in the southern hemisphere of Mars for distances of up to 3000–4000 km.
These graben systems are commonly interpreted to be related to regional tectonic deformation of the Tharsis rise associated with either upwelling or loading.
Analyses of summit caldera complexes on Martian volcanoes imply that the magma supply from the mantle into shallower reservoirs is episodic on Mars, and we interpret the graben systems to be large swarms of laterally emplaced giant dikes resulting from the tapping of melt from episodically rising mantle plumes in a buffered magma supply situation.
www.agu.org /pubs/crossref/2002/2001JE001593.shtml   (557 words)

  
 Introduction   (Site not responding. Last check: 2007-11-07)
The Upper Rhine Graben forms part of the complex Cenozoic rift system of Western and Central Europe that extends from the shores of the North Sea over a distance of some 1100 km into the western Mediterranean.
Moreover, the Quaternary sediments of the Rhine Graben constitute a major aquifer that plays a very important role in the water supply of its population centres and therefore requires management and quality control by modern methods.
Therefore, it is highly desirable to relate, on a regional scale, the neotectonic deformation of the Upper Rhine Graben area to its structural framework in an effort to determine which faults are most likely to move again in the short term, thus assisting an earthquake hazard zonation.
comp1.geol.unibas.ch /~pip/eucor_site/intro.htm   (362 words)

  
 Untitled Document
The width of the graben is ~ 20 km and its length is > 45 km.
The western boundary of the graben is a single, east-dipping fault across which basal beds of the Galeana Member in the footwall are juxtaposed against strata of the upper Balsas Group in the hanging wall.
The end of graben subsidence in the west is constrained by overlap of the western-bounding fault of the graben by upper Balsas rocks.
comp.uark.edu /~pjansma/research_rs_mexico.html   (1772 words)

  
 Oilfield Glossary: Term 'graben'
Graben (used as both singular and plural) can form in areas of rifting or extension, where normal faults are the most common type of fault.
Between graben are relatively high-standing blocks called horsts.
A half-graben is a downdropped block bounded by a normal fault on only one side.
www.glossary.oilfield.slb.com /Display.cfm?Term=graben   (88 words)

  
 Rough Creek Graben   (Site not responding. Last check: 2007-11-07)
The Rough Creek Graben is one of a number of Cambrian rift grabens in eastern North America.
The graben is an asymmetric basin containing up to 18,000 feet of pre-Knox Cambrian sedimentary fill near its northern boundary, the Rough Creek Fault Zone.
There is strong seismic evidence that the Rough Creek Graben has basin-floor fan complexes that could be excellent hydrocarbon reservoirs, as they are in many parts of the world.
www.uky.edu /KGS/emsweb/rcg/rcgstudy.html   (327 words)

  
 Journal of the Geological Society: Evidence from the Gediz graben for episodic two-stage extension in western Turkey
Almost all the grabens in western Turkey are best explained by this episodic, two-stage graben model with an intervening phase of short-term compression, which differs from the progressive evolution inferred for the Basin and Range Province of the USA.
The Gediz graben (also known as the Alasehir graben, or Salihli Alasehir graben) is one of the major structural elements of the western Anatolian extensional province.
It comprises a coarsening upward sequence on the southern margin and a fining-upward sequence on the northern margin (1 and 6 in Fig.
www.findarticles.com /p/articles/mi_qa3721/is_199905/ai_n8842312   (1371 words)

  
 Crestal Collapse Graben/GSA Abstract   (Site not responding. Last check: 2007-11-07)
The rotation of the HW block must be accommodated elsewhere in the HW through the development of antithetic normal faults and crestal collapse graben.
According to our hypothesis, the Pomperaug basin and associated structures are the eroded remnants of the crestal collapse graben for the Hartford basin, the New York Bight basin for the Newark basin, and the Farmville basin and associated structures for the Culpeper-Danville and Deep River basins.
A consequence of the rotation of the HW block is the uplift of basement material adjacent to the developing graben.
www.rci.rutgers.edu /~schlisch/peo87.html   (311 words)

  
 Thesis Outline
The Loppa High Graben appears as though it may connect to the Swaen Graben through a transition zone at the western terminus of the Swaen Graben (Figure 1).
In the western section of the Graben there is an area of offset towards the north (Figures 5 and 6).
In addition, the secondary section of the Graben is visibly offset from the primary section of the Graben in the northwest section of the Jurassic Sequence Boundary transect.
maps.unomaha.edu /Maher/justinsthesis/thesis.html   (4813 words)

  
 Battle of Graben
Graben was a one-off Napoleonics battle which three of my friends and I played on October 5th, 2002 in my basement.
The swampy areas running along either side of the small, swift Graben River are rough ground; all close-order units cross it at half speed and become disordered, but it does not block sighting.
Graben was the hinge of the French position and thus vital to their defense.
www.angelfire.com /wa/rogerswhome/battles/napoleonics/graben/graben.htm   (1916 words)

  
 2475, SAND FLAT GRABEN FAULTS
Synopsis:  Poorly understood Quaternary(?) faults associated with the east-west-trending Sand Flat graben in southeastern Utah, along the southwest margin of the Uncompahgre uplift.
Geologic setting: West- to northwest-trending faults within the Sand Flat graben along the southwestern margin of the Uncompahgre uplift northeast of the Paradox basin.
Age of faulted deposits:  Bedrock as young as Late Cretaceous is faulted at the western end of the Sand Flat graben.
www.ugs.state.ut.us /maps/geohazmap/qfaults/imagemap2/maptext/2475.htm   (409 words)

  
 Graben - Encyclopedia.WorldSearch   (Site not responding. Last check: 2007-11-07)
In geology, a graben is a depressed fault block bordered by normal faults.
Roter Graben 10: Ausgewählte Kapitel aus der Pharmaziegeschichte 1790-1870
The T-Graben: Discovery and Exploration of the Mammalian Graben
encyclopedia.worldsearch.com /graben.htm   (101 words)

  
 Alvin Dive 3354 Summary   (Site not responding. Last check: 2007-11-07)
The central graben actually consists of nested graben, with the deepest part (> 2700 m) close to the western wall which, in contrast to the eastern boundary, consists of a single scarp interrupted only by small ledges.
Most of the graben floor in this region is strongly faulted into horst and graben structure, with vertical walls of 10 m being commonly observed.
This flow, and most others where flow directions could be discerned, appears to have flowed across the graben floor from west to east, suggesting that many eruptive fissures were present on the western side where the deepest, inner graben structure is now.
www.soest.hawaii.edu /atl331/Alvin_Dives/3354/html/a3354summary.html   (426 words)

  
 Graben Hotel Vienna : Hotel In Vienna Austria   (Site not responding. Last check: 2007-11-07)
Graben Hotel Vienna has already been an inn in the 18th century.
The 46 room Graben Hotel Vienna is centrally situated in the heart of the city.
The Hotel Graben Vienna is centrally situated in the heart of the city.
www.holidaycityeurope.com /graben-vienna   (152 words)

  
 PALEOSIS Region II: The Upper Rhine Graben System - Geological Setting
As the Lower Rhine Graben (LGR), the Upper Rhine Graben (URG) is a branch of the Rhine graben system which belongs to the reactivated Cenozoic rift in western Europe.
South of Strasbourg, the subsidence axis crosses the graben to border of the Vosges massif.
The graben is assymetric; to the north, the subsiding zone is located against the eastern fault system (Karlsruhe-Manheim area), to the south, the most subsiding zone is located against the Vosges border faults (Colmar-Thann area).
www.astro.oma.be /PALEOSIS/cushing/index2.htm   (422 words)

  
 Geological Hazards in the Simitli graben
The southern border of the graben is defined by the seismoactive Kroupnik fault.
The character of all the movements along the faults in the Simitli Graben is determined by its compression in the SE-NW direction causing an extension in N-E direction (Zagorcev,1992; Matova et al., 1996), sinistral movements along the Kroupnik fault and prevailing dextral movements along its transverse faults.
The sinistral character of the movements along the Kroupnik fault are confirmed by the meander of the Strouma River in front of the entrance to the Kresna Gorge.
www.geology.bas.bg /rgh/simitli.html   (1289 words)

  
 [No title]   (Site not responding. Last check: 2007-11-07)
Graben also extend toward the northeast and toward the south from the concentric graben.
In general, graben (referring to an elongated down-drop block) form as a result of extensional stresses, but can also form from removal of material underneath (like in sinkholes, although they are not considered graben).
However, the presence of the two linear graben systems (northeast-trending and southern-trending) suggests that the concentric graben may just be a part of the overall surface extension of the region due to general uplift (
www.public.asu.edu /~bdegreg/alba/alba.htm   (631 words)

  
 NMBGMR Staff - Steve Cather - Rotational buoyancy tectonics and models of simple half graben formation   (Site not responding. Last check: 2007-11-07)
Buoyancy forces balance the weight of the half grabens, and torques generated by buoyancy forces are balanced by opposing torques arising from crustal stresses.
Model results indicate that widths of developing half grabens depend on the state of stress in the brittle crust, thickness of the brittle crust, and spacing of boundary faults.
The effective coefficient of friction across the fault must be less-than-or-equal-to 0.1-0.2 for half graben rotation to occur; and probably less-than-or-equal-to 0.1 for wider half grabens to form or any half grabens to rotate through large angles.
geoinfo.nmt.edu /staff/cather/abstract_2.htm   (230 words)

  
 Geological Society - Group Details - Extended Abstract 51
The graben is defined by a master basinward dipping (west dipping) listric fault at the eastern margin and a zone of landward dipping (east-dipping) antithetic faults at the western margin.
delineates the three-dimensional structural framework of the graben and confirms that the study area comprises three structural elements: (1) large westward dipping (basinward) listric faults, (2) eastward dipping (landward) antithetic faults, (3) an inner graben array of smaller synthetic faults.
3D structural analysis of the graben fault geometries and kinematical variance therefore suggest that the salt evacuation history of the salt pillows that underpin the graben bounding faults exerted a strong influence on the evolution of the Western Graben.
www.geolsoc.org.uk /template.cfm?name=extended_51   (863 words)

  
 Rifting in heterogeneous lithosphere: Inferences from numerical modeling of the northern North Sea and the Oslo Graben
In particular, the Oslo Graben and the northern North Sea rift initiated in close areas of northern Europe.
The Oslo Graben evolved in the cold and stable Precambrian lithosphere of Fennoscandia, whereas the northern North Sea rift took birth in freshly reworked Caledonian lithosphere.
Consequently, we suggest that rifting in the northern North Sea began as early as regional extension was effective (i.e., Late Carboniferous–Early Permian) and does not postdate the Oslo Graben as it is commonly assumed.
www.agu.org /pubs/crossref/2002/2001TC901044.shtml   (385 words)

  
 Geology: Graben
A graben is an elongated, relatively depressed crustal unit bounded by faults on both sides.
A graben is caused by a divergent movement of the plate.
Once the graben is deep enough, sea water will flow in and the graben becomes a new sea, slowly but continually widening.
www.showcaves.com /english/explain/Geology/Graben.html   (185 words)

  
 2472, ANNABELLA GRABEN
Geologic setting:  Normal and strike-slip faults forming a wide graben in a structurally complex bend at the north end of the northern Sevier fault (2355) east of Annabella.
  The deformation may also be related to flowage of the Arapien Shale, exposed northeast of the graben, and growth of the south end of the Sanpete‑Sevier Valley anticline.
   A 1982 magnitude 4.0 earthquake and aftershock sequence, associated with internally inconsistent faulting kinematics, was centered in the Annabella graben in a historically rare association of seismicity with mapped Quaternary faults.
www.ugs.state.ut.us /maps/geohazmap/qfaults/imagemap2/maptext/2472.htm   (560 words)

  
 Panama City Beach Florida - Graben Construction - Quality, Award-winning Homes in Northwest Florida
Three generations of skilled craftsmanship in carpentry and artistic design strengthen the Graben experience.
Graben Construction incorporates columns and large entrances with covered porches as well as lots of glass and open plans, allowing the beauty of Florida to spill into the home.
Graben Construction, Inc. has an excellent collection of proven floorplans.
www.grabenhomes.com   (145 words)

  
 EUCOR-URGENT: Upper Rhine Graben Evolution & Neotectonics   (Site not responding. Last check: 2007-11-07)
Lithospheric structure of the Upper Rhine Graben; inferences from teleseismic tomography.
Bouguer gravity of the Upper Rhine Graben: The effect of the basement on the gravity field.
Evolution of fluid circulation in the Rhine Graben; constraints from the chemistry of present fluids.
comp1.geol.unibas.ch /modules.php?name=Content&pa=showpage&pid=2   (6129 words)

  
 PALEOENVIRONMENTAL RECONSTRUCTION OF THE MID-MIOCENE BEAVERHEAD GRABEN IN SOUTHWEST MONTANA   (Site not responding. Last check: 2007-11-07)
During the fall semester of 2004, the Depositional Environments class at the University of Montana-Western measured and described seven sections in the mid-Miocene Six Mile Creek Formation between Dillon and Sheridan, Montana to determine the paleoenvironments, paleogeography and geohistory of the Beaverhead Graben.
The graben was flanked on the east by highlands (i.e., the ancestral Ruby Range) that shed fluvial and debris flow deposits into the graben down a northwest-trending alluvial fan.
The provenance data show that the axial drainage of the graben was from the southwest to the northeast, and that no reversals in this drainage pattern occurred during the time that deposition was active in the graben.
gsa.confex.com /gsa/2004AM/finalprogram/abstract_73941.htm   (384 words)

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