2) The map below shows the topography of a hill and a fault plane that crosses t

Question

2) The map below shows the topography of a hill and a fault plane that crosses the hillside. The intersection of the fault plane with the hill slope is indicated by the dashed line. The contours are labled with the elevations on the slope. The fault strikes NE/SW, and dips 25°, but you are not told the whether the dip is to the SE or NW. You can assume that the fault is planar (not curved) Will a vertical borehole drilled at the point x intersect the fault surface, and if so, at what elevation will the borehole intersect the slope? Explain how you know which way the fault dips and if the fault dips SE, provide a sketch to show how you have determined the elevation of intersectiorn 20 1° Horizontal length scale

Explanation / Answer

A vertical drill hole at point X will intersect the fault surface. This is because the contact of the fault with the hill topography causes abrupt termination of the strata above and below the contact. There is relative displacement of the hanging wall block and the footwall block with respect to the fault plane.

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