List of top Geology Questions on Structural Geology

The dips of the normal and overturned limbs of a horizontal-overturned antiform are 30⁰ and 70⁰, respectively. The interlimb angle of this fold is _______ degrees. (In integer)

Which of the following statements is/are CORRECT for the M-plane of any fault?

In the fold profile section shown in the figure, 1 and 3 are the oldest and the youngest stratigraphic units, respectively. Which one of the following fold descriptions CORRECTLY matches the asymmetric fold shown in the given figure?

The thickness of a dipping coal bed measured along a vertical drill hole is 15 m. If the dip of the coal bed is 30⁰, the orthogonal thickness of the coal bed is ___________ m. (Round off to the nearest integer)

The vertical separation of a displaced horizontal stratum along a dip-slip reverse fault is 10 m when measured on a section perpendicular to the fault-strike. If the dip of the fault is 30⁰, the net slip of the fault will be ______ m. (In integer)

Which ones of the following are formed by brittle deformation?

Which of the following processes are correctly matched with corresponding deformation structures?

The given map shows the outcrop patterns of beds (1 – 4) across a fault plane, F – F’, on a flat ground. X and Y refer to the two blocks across F – F’. Which one of the following options is the correct interpretation of the structure depicted on the map?

A plunging fold will NOT show a V-shaped outcrop pattern on a planar ground surface if the plunge of the fold axis is

A tunnel with vertical walls and arched crown is constructed through a set of sedimentary beds. The thickness of individual beds is significantly less than the wall-height of the tunnel. For which of the following conditions, one of the tunnel walls becomes unstable?

Which one of the following dams resists external forces by its own weight?

Crustal thickness is maximum at the ________.

As per Ramsay’s classification of folds, the maximum thickening of fold hinge and the maximum thinning of the fold limbs are observed in ____.

The attitude of a fault plane was measured to be 350°, 75°E. The rake of the slickenline on the fault plane was found to be 90°. Which of the faults listed below satisfy(ies) these observations?

The number of hinge(s) in a monocline is _______.

If the dip separation vector on a normal fault plane has an attitude 60° → 040° and a magnitude of 6 m, the heave on the fault is ______m. (In integer)

An underground vertical dyke is intercepted by an inclined borehole as shown in the figure below. The length of the dyke core intercepted by the borehole is 4m. If the true thickness of the dyke is 2m, the inclination of the borehole from the vertical is __________ degrees. (In integer)

A bed with an attitude 045°, 20°SE is rotated 60° clockwise (looking down) about a vertical axis. The strike value (in the azimuthal convention following right hand rule) of the rotated bed is ______ degrees. (In integer)

The schematic stereographic projection below shows dip amount and dip direction of three sets of joints (J1, J2 and J3) on a hillslope. If the internal friction angle of the hillslope material is 30°, the strike of the potential failure joint plane (in azimuthal convention following right hand rule) is _____degrees. (In integer)

At a certain depth in the crust, the maximum and minimum principal compressive stresses are 150 MPa and 75 MPa, respectively, which lead to normal faulting. If the average density of the crust is 2700 kg/m$^3$, the crustal depth of fracture initiation according to Anderson's theory of faulting is ................ km. (g = 10 m/s$^2$) [round off to one decimal place]

Which of the given folds is/are represented by the stereoplot? \begin{center} \includegraphics[width=0.5\textwidth]{04.jpeg} \end{center}

Buckle folds result from

Sandstone beds above a magmatic body are domal in shape, while the beds below arc horizontal. The mae,:matic bod.v is a