Mathematics – Logic
Scientific paper
Sep 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996geoji.126f..21b&link_type=abstract
Geophysical Journal International, Volume 126, Issue 3, pp. F21-F24.
Mathematics
Logic
2
Faulting, Flexure, Half-Graben
Scientific paper
Thin-plate flexure theory has previously assumed unconstrained end loading to model the flexure associated with a fault cutting a strong upper crust above an inviscid substratum. This assumption implies that fault planes are not parallel when the density differential across the plate differs on upthrown and downthrown sides, as in the development of a sediment-filled half-graben. A downward-widening extension crack would develop during planar normal faulting, which conflicts with the geological experience that such cracks are closed by overburden pressure below a few hundred metres depth. A new analytical solution is presented, in which the fault planes are constrained to be parallel and in contact. The new theory gives a substantially larger ratio of upthrow to downthrow, and a significantly wider half-graben and narrower uplift.
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