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(ˈaɪsəʊˌpæk) or


(Geological Science) geology a line on a map connecting points below which a particular rock stratum has the same thickness
[C20: from iso- + Greek pakhus thick, pakhutēs thickness]


(ˈaɪ səˌpæk)

a line drawn on a map connecting all points of equal thickness of a particular geologic formation.
[1915–20; iso- + -pach < Greek páchos thickness]
i`so•pach′ous, adj.
References in periodicals archive ?
However, this model would not account for the Eastwards, gradual, heterochronous sinking of the area, the radial flow pattern (imbrications) of the Genna Selole Fm from well-defined areas, or the paleomorphology of the highs and lows evidenced by the Genna Selole Fm isopachs (Figs.
Map also shows Ignimbrite distribution and tephra isopachs for a M = 8.4 catastrophic eruption that occurs in central Kyushu, and the number of people currently living within the areas covered by the isopachs.
Major pyroclastics from this eruption cover areas of ~30,000[km.sup.2] (ignimbrite), ~140,000[km.sup.2] ([greater than or equal to]50cm tephra isopach), 530,000 [km.sup.2] ([greater than or equal to]20cm tephra isopach), 1,510,000[km.sup.2] ([greater than or equal to]10cm tephra isopach), and 2,500,000[km.sup.2] ([greater than or equal to]5cm tephra isopach).
LaBrecque, "Sediment isopachs: circumantarctic to 30S," in Marine Geological and Geophysical Atlas of the Circum-Antarctic to 30S, D.
This database was compiled using previously published isopach maps [42-46], ocean drilling results, and seismic reflection profiles archived in the NGDC as well as seismic data and isopach maps available as a part of the International Geological-Geophysical Atlas of the Pacific Ocean [47].
Houtz, Isopach Map of the Sediments in the Pacific Ocean Basin, Color Map with Text, American Association of Petroleum Geologists, Tulsa, Okla, USA, 1979.
* Do plan maps show the limits of mineralization and alteration and/or isopachs of mineralization?
Model output can include geological cross sections and isopach maps, as well as grade and tonnage estimates.
The quantity of the oil shale seam could be calculated by extracting seam thickness and corresponding areas from the created isopachs using SQL query.
Species transitions, defined here as the serial replacement of one seagrass species by another over time, were evaluated on both a seasonal and annual basis by calculating isopachs (i.e., temporal change maps) using GRASS overlay techniques.