Fault‐propagation folds commonly display footwall synclines as well as changes in stratigraphic thickness and dip on their forelimbs, features that cannot easily be explained by simple parallel kink fold kinematics. An alternative kinematic model, trishear, can explain these observations, as well as a variety of other features which have long intrigued structural geologists. Trishear has received little attention until recently, in part because it must be applied numerically rather than graphically. A new computer program has been developed to analyze trishear and hybrid trishear‐fault‐bend fold deformation. Trishear fold shape can vary considerably by changing the apical angle of the trishear zone and/or the propagation to slip ratio (P/S) during the evolution of the structure. Breakouts, anticlinal and synclinal ramps, and inversion structures can also be modeled, tracking the kinematics with growth strata. Strain within trishear zones can be used to predict fracture orientations throughout the structures as demonstrated by comparison with analog clay models. Also presented is a method for inverting data on real structures for a best fit trishear model by performing a grid search over a six‐parameter space (ramp angle, trishear apical angle, displacement, P/S, and X and Y positions of the fault tip line). The inversion is performed by restoring a key bed to a planar orientation by least squares regression. Because trishear provides a bulk kinematic description of a deforming zone, it is complementary to, rather than competing with, other kinematic models.

Richard W. Allmendinger

Tectonics

构造学 (TECT) 提出了描述和解释地球岩石圈演化、结构和变形的原始科学贡献。欢迎任何相关研究领域的贡献，包括野外、实验室、岩石学、地球化学、地质年代学、地球物理、遥感和建模研究。特别鼓励多学科研究。构造学欢迎跨地质时间范围的研究。

The journal Tectonics is dedicated to publishing original scientific contributions that describe and explain the evolution, structure, and deformation of the Earth's lithosphere. We welcome submissions from any relevant research field, including field studies, laboratory experiments, petrology, geochemistry, geochronology, geophysics, remote sensing, and modeling research. Multidisciplinary studies are particularly encouraged, and research spanning different geological time scales is welcomed.

《Tectonics》期刊致力于发表关于地球岩石圈演化、结构和变形的原创科学研究。我们欢迎来自各个相关研究领域的投稿，包括野外研究、实验室实验、岩石学、地球化学、地质年代学、地球物理学、遥感技术和建模研究。我们特别鼓励多学科的研究，欢迎跨越不同地质时间范围的研究成果。

Inverse and forward numerical modeling of trishear fault‐propagation folds

A new computer program has been developed to analyze tris hear and hybrid trishear‐fault‐bend fold deformation, which provides a bulk kinematic description of a deforming zone and is complementary to, rather than competing with, other kinematics models.

Category	Quartile
地球科学	1
地球科学, 地球化学与地球物理	1

Inverse and forward numerical modeling of trishear fault‐propagation folds

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Journal Info

Category	Quartile
GEOCHEMISTRY & GEOPHYSICS	1