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The AAPG/Datapages Combined Publications Database

AAPG Bulletin

Abstract


Volume: 56 (1972)

Issue: 1. (January)

First Page: 150

Last Page: 158

Title: Null Combination in Fault Interpretation: GEOLOGICAL NOTES

Author(s): John L. Redmond (2)

Abstract:

The direction of bed Previous HitoffsetNext Hit across a fault is a function of four angular variables. Any fault may have a unique combination of the four variables yielding a null combination at which there is no bed Previous HitoffsetNext Hit regardless of the amount of net slip. Furthermore, a given fault movement can cause bed Previous HitoffsetTop in either direction depending on the null combination, even if only dip-slip movement is involved. Consequently, the upthrown or downthrown side of a dip-slip fault commonly cannot be determined positively from outcrop pattern alone, and the absence of certain strata in a vertical borehole does not necessarily indicate a "normal fault."

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