
	Where results make sense

Topic: Isostatic rebound

Related Topics

Continental rebound

Wisconsin glaciation

Ice age

Timeline of glaciation

Glacial Lake Agassiz

Glacial Lake Tonawanda

List of prehistoric lakes

Yarmouth interglacial era

Eemian interglacial era

Lake Manly

Snowball Earth

Pleistocene

Milankovitch cycles

History of Minnesota

Erosion

In the News (Fri 27 Nov 09)

Northern Trust

Marvin Harrison

Peter Chernin

Gary Locke

Match Play

Penelope Cruz

Mickey Rourke

AR Rahman

Danny Boyle

Hugh Jackman

	Isostasy - Wikipedia, the free encyclopedia
		Certain areas (such as the Himalayas) are not in isostatic equilibrium, which has forced researchers to identify other reasons to explain their topographic heights (in the case of the Himalaya, by proposing that their elevation is being "propped-up" by the force of the impacting Indian plate).
		In the simplest example, isostasy is the principle observed by Archimedes in his bath, where he saw that when an object was immersed, an amount of water equal in volume to that of the object was displaced.
		Conversely, isostatic post-glacial rebound is observed in areas once covered by ice-sheets which have now melted, such as around the Baltic Sea and Hudson Bay.
	en.wikipedia.org /wiki/Isostasy (795 words)

	IERS/GGFC/SB Mantle: Glacial Isostatic Adjustment
		The global process of glacial isostatic adjustment (GIA) is the process whereby the Earth's shape and gravitational field are modified in response to the large scale changes in surface mass load that have attended the glaciation and deglaciation of the planetary surface.
		A further influence upon the glacial isostatic adjustment process that has recently been investigated concerns the feedback of the changing rotational state of the planet caused by the glaciation and deglaciation process upon the variations of sea level that occur during the GIA process.
		Glacial isostatic adjustment and earth rotation: refined constrains on the viscosity of the deepest mantle, J. Geophys.
	bowie.gsfc.nasa.gov /ggfc/sbm_gla.html (3321 words)

	Post-glacial rebound - Wikipedia, the free encyclopedia
		Post-glacial rebound (sometimes called continental rebound, isostatic rebound or isostatic adjustment) is the rise of land masses that were depressed by the huge weight of ice sheets during the last ice age, through a process known as isostatic depression.
		Post-glacial rebound has caused numerous significant changes to coastlines and landscapes over the last several thousand years, and the effects continue to be significant.
		In Great Britain, glaciation affected Scotland but not Southern England, and the post-glacial rebound of northern Great Britain is causing a corresponding downward movement of the southern half of the island [1].
	en.wikipedia.org /wiki/Isostatic_rebound (825 words)

	Artpark, Lewiston, New York: Botanical field notes from 2001 and 2002
		In this essay, I mention glacial rebound, isostatic rebound in the Great Lakes region, as a possible explanation for some of the effects of dredging in the Saint Clair River on upper lake levels.
		The curious development of islands at the mouths of tributary streams flowing east-west into the north-south Niagara River axis may be due to isostatic rebound contributing to a decrease in gradient at the mouths of these streams, forcing the streams to be deflected at their mouths.
		Isostatic rebound happens throughout the Great Lakes Watershed region, contributing to enhanced elevations in two additional watersheds, that of the Mississippi River in the United States where improvements in stream gradient are probably beneficial, but also in the Red River watershed in Canada that channels water into Hudson's Bay where stream gradient would deteriorate.
	www.mobot.org /plantscience/resbot/Niag/LakeLevels/isostatic.htm (952 words)

	Leah
		Isostatic rebound occurs when a load is imposed on or removed from the lithosphere.
		Isostatic depression itself is only possible if the asthenosphere can flow away from the depressed area and if the lithosphere is able to move vertically, either along fractures or by elastic bending.
		Isostatic rebound is the sinking or rising of the surface as the lithosphere responds to a surface load by sinking or rising in the asthenosphere.
	www.umich.edu /~gs265/isost.html (2941 words)

	Untitled Document
		Rebound often occurs after deglaciation because the weight of the ice has been removed from the crust.
		For the relatively slow movement of rebounding crust it then seems reasonable to propose that the speed of uplift is controlled by the upward pushing force at the base of the crust.
		In our particular case we are going to have the rebound rate be one meter/year for the a case where 1 km of total rebound is possible (removing some 200 m of load with a continental density).
	maps.unomaha.edu /Maher/ESSlectures/ESSlabs/isostasylab/isostasy.html (1293 words)

	Isostatic Rebound and Lake Bonneville
		After the load is removed there is a rate of recovery, or isostatic rebound, that occurs.
		This rate is dependent on the viscosity of the mantle and the elasticity of the lithosphere in the region (Fowler, 1990).
		(1994), there are two advantages to using lakes for studying isostatic rebound: the load is well known and lakes record climatic history better than glaciers.
	www.geog.utah.edu /geoantiquities/rebound.htm (575 words)

	Abs. g Workshop Report
		Uplift may be achieved by (a) isostatic rebound in response to erosion, (b) crustal shortening and thickening caused by compression, or (c) dynamic pressure at the base of the lithosphere caused by an upwelling mantle plume.
		In Case 1, it is assumed that the uplift is local isostatic rebound in response to erosion of a rock layer 24-mm thick from the surface of the plateau in the vicinity of the benchmark, although the benchmark itself is not eroded away.
		Because the rebound is response to erosion is spread over a broad area, a rock layer 33.3-mm thick must be removed to produce the same 20 mm of uplift at the station.
	cires.colorado.edu /~bilham/Abs_g_Workshop.HTML (4497 words)

	DIFFERENTIAL ISOSTATIC REBOUND ACROSS NORTHERN NEW YORK STATE IMMEDIATELY FOLLOWING DEGLACIATION
		Rebound curves and isobases were derived from these data for three time periods; 1) the early separate pro-glacial lake phases, 2) the confluent phase, and 3) the initial Champlain Sea phase.
		The rebound curves have linear slopes, similar to that reported in the glacial Lake Hitchcock basin (Koteff and Larsen, 1989).
		The temporal trend of the isobases suggests that the Adirondack uplands were initially rebounding at a faster rate than the St. Lawrence or Champlain Valleys.
	gsa.confex.com /gsa/2003AM/finalprogram/abstract_60620.htm (423 words)

	San Juan Island National Historical Park - Nature & Science (Site not responding. Last check: 2007-10-25)
		As the ice sheets melted, the tremendous weight on the land was removed and the land began to slowly rebound (rise).
		Isostatic rebound slowed considerably by 6,600 years ago.
		Although sea levels rose after glaciation the rate of isostatic rebound was greater, thus forming a succession of former beaches that today are viewed as terraces above South Beach.
	www.nps.gov /sajh/pphtml/subnaturalfeatures13.html (418 words)

	The Red River Valley: Tilted Shorelines and Rebounding
		In the Lake Agassiz plain, the effect of the rebound is complicated by weight of water and lake sediments which accumulated as the ice sheet retreated.
		The phenomena of rebound with a general uplift of the terrain is of modern interest, especially since it is still occurring in the far north.
		The sinking and rebound of the earth is a factor to consider when large-scale engineering projects concentrate large masses, such as dams and associated reservoirs or removed large quantities of material in the course of open-pit mining and canal construction.
	www.und.nodak.edu /instruct/eng/fkarner/pages/rebound.htm (1492 words)

	texteust
		First, global sea level is a response to isostatic loads placed on the lithosphere by the overlying ice sheets, which can depress the surface enough to induce localized flooding in coastal areas.
		Thus, when water is removed from the ocean basin, the oceanic crust rebounds isostatically, thereby reducing the amount of local change.
		The amount of isostatic depression in the area was sufficient to cause flooding of ocean water some 30 degrees of longitude inward from the coast.
	www.homepage.montana.edu /~geol445/hyperglac/sealevel2/texteust.htm (1368 words)

	ES 331/767 Lecture 9
		Rates of rebound are almost the same in eastern Canada and Scandinavia--rapid during deglaciation and progressively slower toward the present.
		Evidence for postglacial rebound is found in every area of ice-sheet or ice-cap glaciation during the Pleistocene.
		The results were rebound of the fjord-head region (emergence) and drowning of the shelf area (submergence).
	academic.emporia.edu /aberjame/ice/lec09/lec9.htm (1697 words)

	Isostasy
		In the simplest example, isostasy is the principle observed by Archimedes in his bath, where he saw that when an object was immersed, a volume of water equal to that of the object was displaced.
		Isostatic rebound is observed in areas where a loading force has been removed.
		In this way, it is possible to find sea-cliffs 100s of metres above present-day sea-level.
	www.ebroadcast.com.au /lookup/encyclopedia/is/Isostasy.html (283 words)

	Isostatic Gravity Anomaly Data for the U.S. (Site not responding. Last check: 2007-10-25)
		The 2.5 minute isostatic gravity data set was produced by regridding the 4-km residual isostatic gravity grid of the U.S. by Dr. Richard Hansen of the Cooperative Institute for Geoscience Data Management and Applications (CIGMA).
		The isostatic residual gravity grid was developed by the U.S. Geological Survey using an Airy-Heiskanen model.
		The isostatic grid was derived from the gravity data set used to prepare the Gravity Anomaly Map of the United States (1982) published by the Society of Exploration Geophysicists, and from the 5-minute North American topographic and SYNBAPS bathymetric data sets obtained from the National Geophysical Data Center.
	gcmd.gsfc.nasa.gov /records/GCMD_FE00897.html (310 words)

	How Melting Glaciers Spur Quakes, Volcanoes (Site not responding. Last check: 2007-10-25)
		That "isostatic rebound," according to studies of prehistoric and recent earthquakes and volcanoes, can make the planet's seismic plates slip catastrophically, and cause magma chambers that feed volcanoes to act like bottles of shaken seltzer.
		Instead, the world-wide melting of glaciers portends a seismically active future because of isostatic rebound and also because the meltwater from liquefying glaciers adds mass atop oceanic plates.
		Since isostatic rebound continues for thousands of years, it may still be contributing to quakes in eastern Canada, says geoscientist Patrick Wu of the University of Calgary.
	www.truthout.org /issues_06/printer_061206EC.shtml (840 words)

	Late Quaternary history of the Walker River: The tale of a river with a split personality
		Standard geologic and geomorphic techniques are being used to determine the diversion history of the Walker River including mapping fluvial terraces and channels on aerial photographs, stratigraphic and sedimentologic description, collecting samples for age control, coring channel remnants with a Giddings coring rig, and surveying channel remnants with a Total Station.
		This research is part of a longer-term effort to reconstruct the paleoclimatic and rebound history of the Lahontan region over the last 30 ka.
		Recognition that rapid isostatic rebound may have invoked large-scale geomorphic and hydrographic effects underlies the importance of refining the isostatic rebound model for the Lake Lahontan basin and documenting these effects on the paleoenvironmental history of the region.
	www.dees.dri.edu /Projects/adams_walker.htm (515 words)

	Glacial Lake Hitchcock
		The tilt of this once horizontal water plane is due to isostatic rebound (uplift) of the land after ice retreat.
		If rebound had occurred during ice retreat (as seen at most areas, like the Great Lakes) then the lake-level profile would be curved and the rebound may have caused Glacial Lake Hitchcock to drain prior to achieving its maximum extent.
		A delay in isostatic rebound for thousands of years is unusual and at this point appears to be unique to New England.
	www.bio.umass.edu /biology/conn.river/hitchcock.html (1895 words)

	Geodesy in Antarctica (Site not responding. Last check: 2007-10-25)
		GPS measurement of isostatic rebound and tectonic deformation in Marie Byrd Land, West Antarctica
		Determining the uplift rates due to post glacial rebound will help to determine the timing and configuration of the ice sheet during the Last Glacial Maximum, and may help to determine whether the ice sheet collapsed during the mid-Holocene, about 6000 years ago.
		This project is joint between Bruce Luyendyk of the University of California, Santa Barbara and Andrea Donnellan, Carol Raymond and Erik Ivins of the Jet Propulsion Laboratory, and brings together experts in wMBL geology and tectonics, tectonic geodesy, and lithospheric deformation.
	geodynamics.jpl.nasa.gov /antarctica (790 words)

	NYC Regional Geology
		Today, the greatest amount of isostatic rebound is occurring in the region around Hudson Bay where the Laurentide Ice Sheet was thickest.
		The amount of rebound in and around the New York Bight is perhaps more on the order of 50 meters, with diminishing effects farther to the south.
		It is important to note that the process of crustal isostatic adjustment (sinking and rebound) is much slower than the rate of ice accumulation and melting.
	3dparks.wr.usgs.gov /nyc/morraines/flandrian.htm (2144 words)

	GEOS 112: Isostasy (Site not responding. Last check: 2007-10-25)
		Isostatic rebound has been observed for many formerly glaciated locations.
		One of the best examples comes from scandinavia, which is still rebounding from the last ice age.
		As a result of isostatic rebound it is often possible to see old shorelines that formed at the end of the last glaciation, when the land surface was still depressed, and are now many meters above present sea level.
	www.trincoll.edu /~cgeiss/GEOS_112/isostasy/isostasy.htm (917 words)

	CH590: Flood and Ice
		The earth under the ice sheets is isostatically adjusted to the mass of ice.
		Even if 10,000 or more feet of ice were dropped on Greenland and Antarctica in only a few years about 4,000 years ago, it would take over 12,000 years to reach the observed (today) degree of adjustment.
		Scandinavia and Canada are still rebounding from the disappearance of glaciers covering them at the end of the last ice age (Strahler 1987, chap.
	www.talkorigins.org /indexcc/CH/CH590.html (545 words)

	Author Auteur (Site not responding. Last check: 2007-10-25)
		The ensuing deglaciation and removal of the ice load result in isostatic rebound.
		The rate of isostatic rebound depends on the rigidity of underlying rocks and the loading history and, therefore, reflects the regional geology and the paleoclimate.
		Rebound rates are determined by dating organic materials, such as wood or bones, associated with former sea levels.
	www.ggl.ulaval.ca /cgi-bin/consultau.cgi?593& (439 words)

	Rebound Theory Rebounding--Isostatic Rebound Theory an Error in Geological Interpretation
		Falling sea level gave rise to the erroneous theory of Isostatic Rebound.
		Guy states that sea level datum is the misleading factor in the isostatic rebound theory.
		On the contrary it is the variable in the equation of earth expansion and gave rise to the erroneous theory of isostatic rebound.
	www.emediawire.com /releases/2005/12/prweb324274.php (446 words)

	Body (Site not responding. Last check: 2007-10-25)
		If you require further information, read the sections on isostasy and isostatic adjustment in Chapter 9.) As a result, the rivers there should be _______ their channels.
		Let's suppose for a moment that crustal rebound is not occurring; instead, sea level is falling.
		When a sedimentary basin subsides due to sediment loading, this is an example of ________ adjustment; the uplift of the Himalayas is an example of ________ uplift.
	www.mtsu.edu /~cdharris/GEOL100/erosion/erosion_study-qs_key.htm (847 words)

	Professor Tim Stern (Site not responding. Last check: 2007-10-25)
		Isostatic rebound due to erosion and basin subsidence.
		Exploration of the crust and mantle structure of New Zealand and Antarctica.
		Stern, T., Baxter, A.K. and Barrett, P. Isostatic rebound due to glacial erosion within the Transantarctic Mountains, Geology, 33, 3, P. 67 van Avendonk, H., Holbrook, W.S., Okaya, D., Austin, J., Davey, F, and Stern, T. Continental crust under compression: A seismic refection study of South Island Geophysical Transect 1, South Island, New Zealand.
	www.vuw.ac.nz /geo/staff/stern.html (2422 words)

	Climate Change 2001: The Scientific Basis
		In these analyses of Late Holocene observations, the relative sea level change is attributed to both a contribution from any change in ocean volume and a contribution from the glacio-hydro-isostatic effect, where the former is a function of time only and the latter is a function of both time and position.
		It is possible to use the record of sea level changes to estimate parameters for a model of isostatic rebound.
		In doing this, the spatial variability of sea level change determines the mantle rheology, whereas the time dependence determines any correction that may be required to the assumed history of volume change.
	www.grida.no /climate/ipcc_tar/wg1/423.htm (901 words)

	Scientists see Earth move in Antarctica (Site not responding. Last check: 2007-10-25)
		Isostatic adjustment is vertical movement caused when weight is added or subtracted from parts of the Earth's crust.
		When a glacier is at its heaviest, the crust falls; as it melts or moves from that part, the crust rises.
		To measure isostatic rebound and tectonic deformation, researchers have installed three autonomous, continuously recording global positioning system (GPS) stations on outcrops in western Marie Byrd Land in concert with a series of stations in the Transantarctic Mountains.
	www.jpl.nasa.gov /releases/2000/basin.html (353 words)

	TAMDEF Details (Site not responding. Last check: 2007-10-25)
		We are testing for glacio-isostatic rebound by arranging lines of monuments that stretch west-east from the interior of the region out to the coast of McMurdo Sound and beyond to the islands of the Ross Embayment.
		The rebound signal caused by withdrawl of ice should be obvious when comparing the rebound rate on the inland flanks of the Transantarctic Mountains with those along the coastline and on the islands of the Ross Sea.
		It is likely that there are north-south variations in the stability of the ice sheet based on the location of outlet glaciers and mountain barriers.
	www.geology.ohio-state.edu /~willis/Strategy.htm (746 words)

Try your search on: Qwika (all wikis)