TITLE:
Estimation of Displacement and Extension due to Reverse Drag of Normal Faults: Forward Method
AUTHORS:
Shunshan Xu, Angel Francisco Nieto-Samaniego, Huilong Xu, Susana Alicia Alaniz-Álvarez
KEYWORDS:
Fault Rotation, Fault Drag, Fault Displacement, Extension, Forward Model
JOURNAL NAME:
International Journal of Geosciences,
Vol.15 No.1,
January
31,
2024
ABSTRACT: In the case of reverse drag of normal faulting, the
displacement and horizontal extension are determined based on the established
equations for the three mechanisms: rigid body, vertical shear and inclined
shear. There are three sub-cases of basal detachment for the rigid body model:
horizontal detachment, antithetic detachment and synthetic detachment. For the
rigid body model, the established equations indicate that the total
displacement on the synthetic base (Dt2)
is the largest, that on the horizontal base (Dt1) is moderate, and that on the antithetic base (Dt3) is the smallest. On the other hand,
the value of (Dt1) is
larger than the displacement for the vertical shear (Dt4). The value of (Dt1)
is larger than or less than the displacement for the inclined shear (Dt5) depending on the
original fault dip δ0,
bedding angle θ, and the angle of
shear direction β. For all original parameters, the value of Dt5 is less than the value of Dt4. Also, by comparing three rotation mechanisms, we
find that the inclined shear produces largest extension, the rigid body model
with horizontal detachment produces the smallest extension, and the vertical
shear model produces moderate extension.