downthrow

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downthrow

[′dau̇n‚thrō]
(geology)
The side of a fault whose relative movement appears to have been downward.
References in periodicals archive ?
Northeast to southwest traverse along the cross-section, the Kalabagh Fault appears as a steeply southwest dipping reverse fault along which the eastern side has been downthrown. Along the Kalabagh Fault, a salt plug migrating upward has been interpreted as suggested by its map relationship (Fig.3, 12).
7, SW wall), giving a left-lateral displacement with the downthrown block to the northeast, consistent with the original topography of the area previous to the extraction of aggregates.
Bulk mining first will remove the Enrichment Blanket, and then as operations progress downward, the Berkeley gross pit resource, the Intermediate-depth "Kelley Blocks" resource, the Intermediate-depth zinc-copper resource, and eventually the Anaconda and Pittsmont downthrown block domes.
It can be deduced from this study that the wells drilled on the study area were located to target the rollover anticline formed on the downthrown side of the fault M2 and assisted by minor fault F2.
Oil and gas are found on the upthrown side of the main fault and in the anticlinal structure on the downthrown side of the fault.
Points 602 and SZYM, located on the fault's downthrown wing, show significant displacements similar in direction.
Displacement appears to be approximately 20 feet (6.1 m) with the downthrown block to the north.
Barquest (1989) found that areas adjacent to faults in the Austin Chalk had much higher fracture intensity and weathering, particularly in the downthrown block.
In the downthrown (northern) block several smaller east-west-trending normal faults occur and although the displacement on these structures is small (5 to 25m) they appear to have acted as conduits for mineralization.
The company said, "The Garten discovery well targeted a downthrown structural closure and encountered more than 700 feet of net oil pay in stacked, high quality Jurassic-aged sandstone reservoirs.
The Shunnan area is a three-level structural unit within the Tarim Basin, located at the downthrown side of the boundary fault I of the Tazhong Low uplift (Figure 1).
With a downthrown of the western block it also affects the Choiyoi Group and Las Lagunitas Formation (Figs.